As of 2020, the state of Maryland has a total of 627 postal codes. In the table below, you can see all Maryland zip codes listed by city, town and village as well as county affiliated. With 431 cities (and towns) and 24 counties (and county-equivalents), Maryland is the 19th largest state by population (6,016,447) and 42nd largest one by land area (25,142 km2) in the United States.
The capital of Maryland is Baltimore and major cities include Frederick, Rockville, Gaithersburg, Bowie, and Annapolis.
List of Maryland Zip Codes by City
| # | City | Postal Code | County |
| 1 | Abell | 20606 | St. Mary’s |
| 2 | Aberdeen | 21001 | Harford |
| 3 | Aberdeen Proving Gro | 21005 | Harford |
| 4 | Aberdeen Proving Gro | 21010 | Harford |
| 5 | Abingdon | 21009 | Harford |
| 6 | Accident | 21520 | Garrett |
| 7 | Accokeek | 20607 | Prince George’s |
| 8 | Adamstown | 21710 | Frederick |
| 9 | Allen | 21810 | |
| 10 | Andrews Air Force Ba | 20762 | |
| 11 | Annapolis | 21401 | |
| 12 | Annapolis | 21402 | Anne Arundel |
| 13 | Annapolis | 21403 | Anne Arundel |
| 14 | Annapolis | 21404 | |
| 15 | Annapolis | 21405 | |
| 16 | Annapolis | 21411 | Anne Arundel |
| 17 | Annapolis | 21412 | Anne Arundel |
| 18 | Annapolis Junction | 20701 | Howard |
| 19 | Aquasco | 20608 | Prince George’s |
| 20 | Arnold | 21012 | Anne Arundel |
| 21 | Ashton | 20861 | Montgomery |
| 22 | Avenue | 20609 | St. Mary’s |
| 23 | Baldwin | 21013 | Baltimore |
| 24 | Baltimore | 21201 | Baltimore |
| 25 | Baltimore | 21202 | Baltimore |
| 26 | Baltimore | 21203 | Baltimore |
| 27 | Baltimore | 21204 | Baltimore |
| 28 | Baltimore | 21205 | Baltimore |
| 29 | Baltimore | 21206 | Baltimore |
| 30 | Baltimore | 21207 | Baltimore |
| 31 | Baltimore | 21208 | Baltimore |
| 32 | Baltimore | 21209 | Baltimore |
| 33 | Baltimore | 21210 | Baltimore |
| 34 | Baltimore | 21211 | Baltimore |
| 35 | Baltimore | 21212 | Baltimore |
| 36 | Baltimore | 21213 | Baltimore |
| 37 | Baltimore | 21214 | Baltimore |
| 38 | Baltimore | 21215 | Baltimore |
| 39 | Baltimore | 21216 | Baltimore |
| 40 | Baltimore | 21217 | Baltimore |
| 41 | Baltimore | 21218 | Baltimore |
| 42 | Baltimore | 21219 | Baltimore |
| 43 | Baltimore | 21220 | Baltimore |
| 44 | Baltimore | 21221 | Baltimore |
| 45 | Baltimore | 21222 | Baltimore |
| 46 | Baltimore | 21223 | Baltimore |
| 47 | Baltimore | 21224 | Baltimore |
| 48 | Baltimore | 21225 | Anne Arundel |
| 49 | Baltimore | 21226 | Anne Arundel |
| 50 | Baltimore | 21227 | Baltimore |
| 51 | Baltimore | 21228 | Baltimore |
| 52 | Baltimore | 21229 | Baltimore |
| 53 | Baltimore | 21230 | Baltimore |
| 54 | Baltimore | 21231 | Baltimore |
| 55 | Baltimore | 21233 | Baltimore |
| 56 | Baltimore | 21234 | Baltimore |
| 57 | Baltimore | 21235 | Baltimore |
| 58 | Baltimore | 21236 | Baltimore |
| 59 | Baltimore | 21237 | Baltimore |
| 60 | Baltimore | 21239 | Baltimore |
| 61 | Baltimore | 21240 | Baltimore |
| 62 | Baltimore | 21241 | Baltimore |
| 63 | Baltimore | 21250 | Baltimore |
| 64 | Baltimore | 21251 | Baltimore |
| 65 | Baltimore | 21252 | Baltimore |
| 66 | Baltimore | 21263 | Baltimore |
| 67 | Baltimore | 21264 | Baltimore |
| 68 | Baltimore | 21265 | Baltimore |
| 69 | Baltimore | 21268 | Baltimore |
| 70 | Baltimore | 21270 | Baltimore |
| 71 | Baltimore | 21273 | Baltimore |
| 72 | Baltimore | 21274 | Baltimore |
| 73 | Baltimore | 21275 | Baltimore |
| 74 | Baltimore | 21278 | Baltimore |
| 75 | Baltimore | 21279 | Baltimore |
| 76 | Baltimore | 21280 | Baltimore |
| 77 | Baltimore | 21281 | Baltimore |
| 78 | Baltimore | 21282 | Baltimore |
| 79 | Baltimore | 21283 | Baltimore |
| 80 | Baltimore | 21284 | Baltimore |
| 81 | Baltimore | 21285 | Baltimore |
| 82 | Baltimore | 21287 | Baltimore |
| 83 | Baltimore | 21288 | Baltimore |
| 84 | Baltimore | 21289 | Baltimore |
| 85 | Baltimore | 21290 | Baltimore |
| 86 | Baltimore | 21297 | Baltimore |
| 87 | Baltimore | 21298 | Baltimore |
| 88 | Barclay | 21607 | Queen Anne’s |
| 89 | Barnesville | 20838 | Montgomery |
| 90 | Barstow | 20610 | Calvert |
| 91 | Barton | 21521 | Allegany |
| 92 | Beallsville | 20839 | Montgomery |
| 93 | Bel Air | 21014 | Harford |
| 94 | Bel Air | 21015 | |
| 95 | Bel Alton | 20611 | Charles |
| 96 | Belcamp | 21017 | Harford |
| 97 | Beltsville | 20704 | |
| 98 | Beltsville | 20705 | Prince George’s |
| 99 | Benedict | 20612 | |
| 100 | Benson | 21018 | |
| 101 | Berlin | 21811 | Worcester |
| 102 | Bethesda | 20813 | |
| 103 | Bethesda | 20814 | Montgomery |
| 104 | Bethesda | 20815 | Montgomery |
| 105 | Bethesda | 20816 | Montgomery |
| 106 | Bethesda | 20817 | Montgomery |
| 107 | Bethesda | 20824 | |
| 108 | Bethesda | 20827 | |
| 109 | Bethesda | 20889 | Montgomery |
| 110 | Bethesda | 20892 | Montgomery |
| 111 | Bethesda | 20894 | Montgomery |
| 112 | Bethlehem | 21609 | |
| 113 | Betterton | 21610 | |
| 114 | Big Pool | 21711 | Washington |
| 115 | Bishopville | 21813 | Worcester |
| 116 | Bittinger | 21522 | Garrett |
| 117 | Bivalve | 21814 | |
| 118 | Bladensburg | 20710 | Prince George’s |
| 119 | Bloomington | 21523 | Garrett |
| 120 | Boonsboro | 21713 | Washington |
| 121 | Boring | 21020 | |
| 122 | Bowie | 20715 | Prince George’s |
| 123 | Bowie | 20716 | Prince George’s |
| 124 | Bowie | 20717 | |
| 125 | Bowie | 20718 | |
| 126 | Bowie | 20719 | |
| 127 | Bowie | 20720 | |
| 128 | Bowie | 20721 | |
| 129 | Boyds | 20841 | Montgomery |
| 130 | Bozman | 21612 | |
| 131 | Braddock Heights | 21714 | |
| 132 | Bradshaw | 21021 | Baltimore |
| 133 | Brandywine | 20613 | Prince George’s |
| 134 | Brentwood | 20722 | Prince George’s |
| 135 | Brinklow | 20862 | Montgomery |
| 136 | Brookeville | 20833 | Montgomery |
| 137 | Brooklandville | 21022 | |
| 138 | Broomes Island | 20615 | Calvert |
| 139 | Brownsville | 21715 | |
| 140 | Brunswick | 21716 | Frederick |
| 141 | Bryans Road | 20616 | Charles |
| 142 | Bryantown | 20617 | Charles |
| 143 | Buckeystown | 21717 | |
| 144 | Burkittsville | 21718 | Frederick |
| 145 | Burtonsville | 20866 | Montgomery |
| 146 | Bushwood | 20618 | St. Mary’s |
| 147 | Butler | 21023 | |
| 148 | Cabin John | 20818 | Montgomery |
| 149 | California | 20619 | St. Mary’s |
| 150 | Callaway | 20620 | |
| 151 | Cambridge | 21613 | Dorchester |
| 152 | Capital Heights | 20743 | Prince George’s |
| 153 | Capital Heights | 20790 | Prince George’s |
| 154 | Capitol Heights | 20731 | |
| 155 | Capitol Heights | 20791 | |
| 156 | Cascade | 21719 | Washington |
| 157 | Cavetown | 21720 | |
| 158 | Cecilton | 21913 | Cecil |
| 159 | Centreville | 21617 | Queen Anne’s |
| 160 | Chance | 21816 | |
| 161 | Chaptico | 20621 | St. Mary’s |
| 162 | Charlestown | 21914 | Cecil |
| 163 | Charlotte Hall | 20622 | St. Mary’s |
| 164 | Chase | 21027 | |
| 165 | Cheltenham | 20623 | Prince George’s |
| 166 | Chesapeake Beach | 20732 | Calvert |
| 167 | Chesapeake City | 21915 | Cecil |
| 168 | Chester | 21619 | Queen Anne’s |
| 169 | Chestertown | 21620 | Kent |
| 170 | Chevy Chase | 20825 | |
| 171 | Chewsville | 21721 | |
| 172 | Childs | 21916 | Cecil |
| 173 | Church Creek | 21622 | |
| 174 | Church Hill | 21623 | Frederick |
| 175 | Church Hill | 21656 | |
| 176 | Church Hill | 21690 | Frederick |
| 177 | Churchton | 20733 | Anne Arundel |
| 178 | Churchville | 21028 | Harford |
| 179 | Claiborne | 21624 | Talbot |
| 180 | Clarksburg | 20871 | Montgomery |
| 181 | Clarksville | 21029 | Howard |
| 182 | Clear Spring | 21722 | Washington |
| 183 | Clements | 20624 | St. Mary’s |
| 184 | Clinton | 20735 | Prince George’s |
| 185 | Cobb Island | 20625 | |
| 186 | Cockeysville/Hunt Va | 21030 | Baltimore |
| 187 | Cockeysville/Hunt Va | 21031 | Baltimore |
| 188 | College Park | 20740 | Prince George’s |
| 189 | College Park | 20741 | |
| 190 | College Park | 20742 | Prince George’s |
| 191 | Colora | 21917 | Cecil |
| 192 | Coltons Point | 20626 | St. Mary’s |
| 193 | Columbia | 21044 | Howard |
| 194 | Columbia | 21045 | Howard |
| 195 | Columbia | 21046 | Howard |
| 196 | Columbia | 21098 | Howard |
| 197 | Compton | 20627 | St. Mary’s |
| 198 | Conowingo | 21918 | Cecil |
| 199 | Cooksville | 21723 | Howard |
| 200 | Cordova | 21625 | Talbot |
| 201 | Corriganville | 21524 | |
| 202 | Crapo | 21626 | |
| 203 | Crisfield | 21817 | Somerset |
| 204 | Crocheron | 21627 | |
| 205 | Crofton | 21114 | Anne Arundel |
| 206 | Crownsville | 21032 | Anne Arundel |
| 207 | Crumpton | 21628 | |
| 208 | Cumberland | 21501 | |
| 209 | Cumberland | 21502 | Allegany |
| 210 | Cumberland | 21503 | Allegany |
| 211 | Cumberland | 21504 | Allegany |
| 212 | Cumberland | 21505 | Allegany |
| 213 | Damascus | 20872 | Montgomery |
| 214 | Dameron | 20628 | St. Mary’s |
| 215 | Dames Quarter | 21820 | |
| 216 | Darlington | 21034 | Harford |
| 217 | Davidsonville | 21035 | Anne Arundel |
| 218 | Dayton | 21036 | Howard |
| 219 | Deal Island | 21821 | |
| 220 | Deale | 20751 | Anne Arundel |
| 221 | Delmar | 21875 | Wicomico |
| 222 | Denton | 21629 | Caroline |
| 223 | Detour | 21725 | Carroll |
| 224 | Dickerson | 20842 | Montgomery |
| 225 | District Heights | 20747 | Prince George’s |
| 226 | District Heights | 20753 | |
| 227 | Dowell | 20629 | Calvert |
| 228 | Drayden | 20630 | St. Mary’s |
| 229 | Dunkirk | 20754 | Calvert |
| 230 | Earleville | 21919 | Cecil |
| 231 | East New Market | 21631 | Dorchester |
| 232 | Easton | 21601 | Talbot |
| 233 | Easton | 21606 | |
| 234 | Eckhart Mines | 21528 | |
| 235 | Eden | 21822 | Somerset |
| 236 | Edgewater | 21037 | Anne Arundel |
| 237 | Edgewood | 21040 | Harford |
| 238 | Elk Mills | 21920 | Cecil |
| 239 | Elkridge | 21075 | |
| 240 | Elkton | 21921 | Cecil |
| 241 | Elkton | 21922 | |
| 242 | Ellerslie | 21529 | |
| 243 | Ellicott City | 21041 | Howard |
| 244 | Ellicott City | 21042 | Howard |
| 245 | Ellicott City | 21043 | Howard |
| 246 | Emmitsburg | 21727 | Frederick |
| 247 | Ewell | 21824 | |
| 248 | Fair Play | 21733 | Washington |
| 249 | Fallston | 21047 | Harford |
| 250 | Faulkner | 20632 | Charles |
| 251 | Federalsburg | 21632 | Caroline |
| 252 | Finksburg | 21048 | Carroll |
| 253 | Fishing Creek | 21634 | |
| 254 | Flintstone | 21530 | Allegany |
| 255 | Forest Hill | 21050 | Harford |
| 256 | Fork | 21051 | Baltimore |
| 257 | Fort George G Meade | 20755 | Anne Arundel |
| 258 | Fort Howard | 21052 | |
| 259 | Fort Washington | 20744 | Prince George’s |
| 260 | Fort Washington | 20749 | |
| 261 | Frederick | 21701 | Frederick |
| 262 | Frederick | 21702 | Frederick |
| 263 | Frederick | 21703 | Frederick |
| 264 | Frederick | 21704 | Frederick |
| 265 | Frederick | 21705 | Frederick |
| 266 | Frederick | 21709 | Frederick |
| 267 | Freeland | 21053 | Baltimore |
| 268 | Friendship | 20758 | Anne Arundel |
| 269 | Friendsville | 21531 | Garrett |
| 270 | Frostburg | 21532 | Allegany |
| 271 | Fruitland | 21826 | Wicomico |
| 272 | Fulton | 20759 | Howard |
| 273 | Funkstown | 21734 | |
| 274 | Gaithersburg | 20877 | Montgomery |
| 275 | Gaithersburg | 20878 | Montgomery |
| 276 | Gaithersburg | 20879 | Montgomery |
| 277 | Gaithersburg | 20882 | Montgomery |
| 278 | Gaithersburg | 20884 | Montgomery |
| 279 | Gaithersburg | 20885 | Montgomery |
| 280 | Gaithersburg | 20898 | Montgomery |
| 281 | Gaithersburg | 20899 | Montgomery |
| 282 | Galena | 21635 | Kent |
| 283 | Galesville | 20765 | |
| 284 | Gambrills | 21054 | Anne Arundel |
| 285 | Gapland | 21736 | Washington |
| 286 | Garrett Park | 20896 | Montgomery |
| 287 | Garrison | 21055 | |
| 288 | Georgetown | 21930 | |
| 289 | Germantown | 20874 | Montgomery |
| 290 | Germantown | 20875 | |
| 291 | Germantown | 20876 | Montgomery |
| 292 | Gibson Island | 21056 | |
| 293 | Girdletree | 21829 | Worcester |
| 294 | Glen Arm | 21057 | Baltimore |
| 295 | Glen Burnie | 21060 | Anne Arundel |
| 296 | Glen Burnie | 21061 | Anne Arundel |
| 297 | Glen Burnie | 21062 | Anne Arundel |
| 298 | Glen Echo | 20812 | Montgomery |
| 299 | Glenelg | 21737 | Howard |
| 300 | Glenn Dale | 20769 | Prince George’s |
| 301 | Glenwood | 21738 | Howard |
| 302 | Glyndon | 21071 | Baltimore |
| 303 | Goldsboro | 21636 | Caroline |
| 304 | Golts | 21637 | Kent |
| 305 | Grantsville | 21536 | Garrett |
| 306 | Grasonville | 21638 | Queen Anne’s |
| 307 | Great Mills | 20634 | St. Mary’s |
| 308 | Greenbelt | 20768 | |
| 309 | Greenbelt | 20770 | Prince George’s |
| 310 | Greenbelt | 20771 | Prince George’s |
| 311 | Greensboro | 21639 | Caroline |
| 312 | Gwynn Oak | 21244 | Baltimore |
| 313 | Hagerstown | 21740 | Washington |
| 314 | Hagerstown | 21741 | |
| 315 | Hagerstown | 21742 | |
| 316 | Hagerstown | 21746 | Washington |
| 317 | Hagerstown | 21747 | Washington |
| 318 | Hagerstown | 21748 | Washington |
| 319 | Hagerstown | 21749 | Washington |
| 320 | Hampstead | 21074 | Baltimore |
| 321 | Hancock | 21750 | Washington |
| 322 | Hanover | 21076 | Anne Arundel |
| 323 | Harmans | 21077 | |
| 324 | Harwood | 20776 | Anne Arundel |
| 325 | Havre De Grace | 21078 | Harford |
| 326 | Hebron | 21830 | Wicomico |
| 327 | Helen | 20635 | St. Mary’s |
| 328 | Henderson | 21640 | Caroline |
| 329 | Henryton | 21080 | |
| 330 | Highland | 20777 | Howard |
| 331 | Hillsboro | 21641 | |
| 332 | Hollywood | 20636 | St. Mary’s |
| 333 | Hughesville | 20637 | Charles |
| 334 | Huntingtown | 20639 | Calvert |
| 335 | Hurlock | 21643 | Dorchester |
| 336 | Hyattsville | 20781 | Prince George’s |
| 337 | Hyattsville | 20782 | Prince George’s |
| 338 | Hyattsville | 20783 | Prince George’s |
| 339 | Hyattsville | 20784 | Prince George’s |
| 340 | Hyattsville | 20785 | Prince George’s |
| 341 | Hyattsville | 20787 | |
| 342 | Hyattsville | 20788 | |
| 343 | Hydes | 21082 | Baltimore |
| 344 | Ijamsville | 21754 | Frederick |
| 345 | Indian Head | 20640 | Charles |
| 346 | Ingleside | 21644 | Queen Anne’s |
| 347 | Ironsides | 20643 | |
| 348 | Issue | 20645 | Charles |
| 349 | Jarrettsville | 21084 | Harford |
| 350 | Jefferson | 21755 | Frederick |
| 351 | Jessup | 20794 | Anne Arundel |
| 352 | Joppa | 21085 | Harford |
| 353 | Keedysville | 21756 | Washington |
| 354 | Kennedyville | 21645 | Kent |
| 355 | Kensington | 20891 | Montgomery |
| 356 | Kensington | 20895 | Montgomery |
| 357 | Keymar | 21757 | Carroll |
| 358 | Kingsville | 21087 | Baltimore |
| 359 | Kitzmiller | 21538 | Garrett |
| 360 | Knoxville | 21758 | Frederick |
| 361 | La Plata | 20646 | Charles |
| 362 | Ladiesburg | 21759 | |
| 363 | Lanham | 20703 | |
| 364 | Lanham-Seabrook | 20706 | Prince George’s |
| 365 | Laurel | 20707 | Prince George’s |
| 366 | Laurel | 20708 | Prince George’s |
| 367 | Laurel | 20709 | |
| 368 | Laurel | 20723 | Howard |
| 369 | Laurel | 20724 | Anne Arundel |
| 370 | Laurel | 20725 | |
| 371 | Laurel | 20726 | |
| 372 | Leonardtown | 20650 | St. Mary’s |
| 373 | Lexington Park | 20653 | St. Mary’s |
| 374 | Libertytown | 21762 | |
| 375 | Linkwood | 21835 | Dorchester |
| 376 | Linthicum Heights | 21090 | Anne Arundel |
| 377 | Linwood | 21764 | Carroll |
| 378 | Lisbon | 21765 | |
| 379 | Little Orleans | 21766 | Allegany |
| 380 | Lonaconing | 21539 | Allegany |
| 381 | Long Green | 21092 | |
| 382 | Lothian | 20711 | Anne Arundel |
| 383 | Loveville | 20656 | St. Mary’s |
| 384 | Lusby | 20657 | Calvert |
| 385 | Lutherville Timonium | 21094 | |
| 386 | Lutherville-Timonium | 21093 | Baltimore |
| 387 | Madison | 21648 | |
| 388 | Magnolia | 21101 | |
| 389 | Manchester | 21088 | Carroll |
| 390 | Manchester | 21102 | Carroll |
| 391 | Manokin | 21836 | |
| 392 | Marbury | 20658 | Charles |
| 393 | Mardela Springs | 21837 | Wicomico |
| 394 | Marion Station | 21838 | Somerset |
| 395 | Marydel | 21649 | Caroline |
| 396 | Maryland Line | 21105 | |
| 397 | Massey | 21650 | Kent |
| 398 | Maugansville | 21767 | Washington |
| 399 | Mayo | 21106 | |
| 400 | Mc Henry | 21541 | Garrett |
| 401 | Mcdaniel | 21647 | Talbot |
| 402 | Mechanicsville | 20659 | St. Mary’s |
| 403 | Middletown | 21769 | Frederick |
| 404 | Midland | 21542 | |
| 405 | Midlothian | 21543 | |
| 406 | Millers | 21107 | Carroll |
| 407 | Millersville | 21108 | Anne Arundel |
| 408 | Millington | 21651 | Kent |
| 409 | Monkton | 21111 | Baltimore |
| 410 | Monrovia | 21770 | |
| 411 | Montgomery Village | 20886 | Montgomery |
| 412 | Morganza | 20660 | |
| 413 | Mount Airy | 21771 | Carroll |
| 414 | Mount Rainier | 20712 | Prince George’s |
| 415 | Mount Savage | 21545 | Allegany |
| 416 | Mount Victoria | 20661 | |
| 417 | Myersville | 21773 | Frederick |
| 418 | Nanjemoy | 20662 | Charles |
| 419 | Nanticoke | 21840 | |
| 420 | Neavitt | 21652 | |
| 421 | New Market | 21774 | |
| 422 | New Midway | 21775 | |
| 423 | New Windsor | 21776 | Carroll |
| 424 | Newark | 21841 | Worcester |
| 425 | Newburg | 20664 | Charles |
| 426 | Newcomb | 21653 | Talbot |
| 427 | North Beach | 20714 | Calvert |
| 428 | North East | 21901 | Cecil |
| 429 | Oakland | 21550 | Garrett |
| 430 | Ocean City | 21842 | Worcester |
| 431 | Ocean City | 21843 | |
| 432 | Odenton | 21113 | Anne Arundel |
| 433 | Oldtown | 21555 | Allegany |
| 434 | Olney | 20830 | |
| 435 | Olney | 20832 | Montgomery |
| 436 | Owings | 20736 | Calvert |
| 437 | Owings Mills | 21117 | Baltimore |
| 438 | Oxford | 21654 | Talbot |
| 439 | Oxon Hill | 20745 | Prince George’s |
| 440 | Oxon Hill | 20750 | |
| 441 | Park Hall | 20667 | |
| 442 | Parkton | 21120 | Baltimore |
| 443 | Parsonsburg | 21849 | Wicomico |
| 444 | Pasadena | 21122 | Anne Arundel |
| 445 | Pasadena | 21123 | Anne Arundel |
| 446 | Patuxent River | 20670 | St. Mary’s |
| 447 | Perry Hall | 21128 | Baltimore |
| 448 | Perry Point | 21902 | |
| 449 | Perryman | 21130 | |
| 450 | Perryville | 21903 | Cecil |
| 451 | Phoenix | 21131 | Baltimore |
| 452 | Piney Point | 20674 | St. Mary’s |
| 453 | Pinto | 21556 | |
| 454 | Pittsville | 21850 | Wicomico |
| 455 | Pocomoke City | 21851 | Worcester |
| 456 | Point Of Rocks | 21777 | Frederick |
| 457 | Pomfret | 20675 | Charles |
| 458 | Poolesville | 20837 | Montgomery |
| 459 | Port Deposit | 21904 | Cecil |
| 460 | Port Republic | 20676 | Calvert |
| 461 | Port Tobacco | 20677 | Charles |
| 462 | Potomac | 20859 | |
| 463 | Powellville | 21852 | Wicomico |
| 464 | Preston | 21655 | Caroline |
| 465 | Prince Frederick | 20678 | Calvert |
| 466 | Princess Anne | 21853 | Somerset |
| 467 | Pylesville | 21132 | Harford |
| 468 | Quantico | 21856 | Wicomico |
| 469 | Queen Anne | 21657 | Queen Anne’s |
| 470 | Queenstown | 21658 | Queen Anne’s |
| 471 | Randallstown | 21133 | Baltimore |
| 472 | Rawlings | 21557 | Allegany |
| 473 | Rehobeth | 21857 | |
| 474 | Reisterstown | 21136 | Baltimore |
| 475 | Rhodesdale | 21659 | Dorchester |
| 476 | Riderwood | 21139 | |
| 477 | Ridge | 20680 | St. Mary’s |
| 478 | Ridgely | 21660 | Caroline |
| 479 | Ridgely | 21681 | Caroline |
| 480 | Ridgely | 21682 | Caroline |
| 481 | Ridgely | 21683 | Caroline |
| 482 | Ridgely | 21684 | Caroline |
| 483 | Ridgely | 21685 | Caroline |
| 484 | Ridgely | 21686 | Caroline |
| 485 | Ridgely | 21687 | Caroline |
| 486 | Ridgely | 21688 | Caroline |
| 487 | Rising Sun | 21911 | Cecil |
| 488 | Riva | 21140 | Anne Arundel |
| 489 | Riverdale | 20737 | Prince George’s |
| 490 | Riverdale | 20738 | |
| 491 | Rock Hall | 21661 | Kent |
| 492 | Rock Point | 20682 | Charles |
| 493 | Rockville | 20847 | |
| 494 | Rockville | 20848 | |
| 495 | Rockville | 20849 | |
| 496 | Rockville | 20850 | Montgomery |
| 497 | Rockville | 20851 | Montgomery |
| 498 | Rockville | 20852 | Montgomery |
| 499 | Rockville | 20853 | Montgomery |
| 500 | Rockville | 20854 | Montgomery |
| 501 | Rockville | 20855 | Montgomery |
| 502 | Rockville | 20857 | Montgomery |
| 503 | Rocky Ridge | 21778 | Frederick |
| 504 | Rohrersville | 21779 | Washington |
| 505 | Royal Oak | 21662 | |
| 506 | Sabillasville | 21780 | Frederick |
| 507 | Saint Inigoes | 20684 | St. Mary’s |
| 508 | Saint James | 21781 | |
| 509 | Saint Leonard | 20685 | Calvert |
| 510 | Saint Marys City | 20686 | |
| 511 | Saint Michaels | 21663 | Talbot |
| 512 | Salisbury | 21801 | Wicomico |
| 513 | Salisbury | 21802 | |
| 514 | Salisbury | 21803 | |
| 515 | Salisbury | 21804 | |
| 516 | Sandy Spring | 20860 | Montgomery |
| 517 | Savage | 20763 | Howard |
| 518 | Scotland | 20687 | St. Mary’s |
| 519 | Secretary | 21664 | |
| 520 | Severn | 21144 | Anne Arundel |
| 521 | Severna Park | 21146 | Anne Arundel |
| 522 | Shady Side | 20764 | Anne Arundel |
| 523 | Sharpsburg | 21782 | Washington |
| 524 | Sharptown | 21861 | |
| 525 | Sherwood | 21665 | |
| 526 | Showell | 21862 | |
| 527 | Silver Spring | 20901 | Montgomery |
| 528 | Silver Spring | 20902 | Montgomery |
| 529 | Silver Spring | 20903 | Montgomery |
| 530 | Silver Spring | 20904 | Montgomery |
| 531 | Silver Spring | 20905 | Montgomery |
| 532 | Silver Spring | 20906 | Montgomery |
| 533 | Silver Spring | 20907 | Montgomery |
| 534 | Silver Spring | 20908 | Montgomery |
| 535 | Silver Spring | 20910 | Montgomery |
| 536 | Silver Spring | 20911 | Montgomery |
| 537 | Silver Spring | 20912 | Montgomery |
| 538 | Silver Spring | 20914 | Montgomery |
| 539 | Silver Spring | 20915 | Montgomery |
| 540 | Silver Spring | 20916 | Montgomery |
| 541 | Silver Spring | 20918 | Montgomery |
| 542 | Silver Spring | 20990 | Montgomery |
| 543 | Simpsonville | 21150 | Howard |
| 544 | Smithsburg | 21783 | Washington |
| 545 | Snow Hill | 21863 | Worcester |
| 546 | Solomons | 20688 | Calvert |
| 547 | Southern Md Facility | 20697 | Prince George’s |
| 548 | Southern Md Facility | 20797 | Prince George’s |
| 549 | Sparks Glencoe | 21152 | Baltimore |
| 550 | Spencerville | 20868 | Montgomery |
| 551 | Spring Gap | 21560 | |
| 552 | Stevenson | 21153 | |
| 553 | Stevensville | 21666 | Queen Anne’s |
| 554 | Still Pond | 21667 | Kent |
| 555 | Stockton | 21864 | Worcester |
| 556 | Street | 21154 | Harford |
| 557 | Suburb Maryland Fac | 20800 | |
| 558 | Suburb Maryland Fac | 20890 | Montgomery |
| 559 | Suburb Maryland Fac | 20897 | Montgomery |
| 560 | Suburb Maryland Fac | 20997 | Montgomery |
| 561 | Sudlersville | 21668 | Queen Anne’s |
| 562 | Suitland | 20746 | Prince George’s |
| 563 | Suitland | 20752 | |
| 564 | Sunderland | 20689 | Calvert |
| 565 | Swanton | 21561 | Garrett |
| 566 | Sykesville | 21784 | Carroll |
| 567 | Takoma Park | 20913 | Montgomery |
| 568 | Tall Timbers | 20690 | St. Mary’s |
| 569 | Taneytown | 21787 | Carroll |
| 570 | Taylors Island | 21669 | |
| 571 | Temple Hills | 20748 | Prince George’s |
| 572 | Temple Hills | 20757 | |
| 573 | Templeville | 21670 | |
| 574 | Thurmont | 21788 | Frederick |
| 575 | Tilghman | 21671 | |
| 576 | Toddville | 21672 | |
| 577 | Towson | 21286 | Baltimore |
| 578 | Tracys Landing | 20779 | Anne Arundel |
| 579 | Trappe | 21673 | Talbot |
| 580 | Tuscarora | 21790 | Frederick |
| 581 | Tyaskin | 21865 | Wicomico |
| 582 | Tylerton | 21866 | |
| 583 | Union Bridge | 21791 | Carroll |
| 584 | Unionville | 21792 | |
| 585 | Upper Fairmount | 21867 | |
| 586 | Upper Falls | 21156 | Baltimore |
| 587 | Upper Marlboro | 20772 | Prince George’s |
| 588 | Upper Marlboro | 20773 | |
| 589 | Upper Marlboro | 20774 | |
| 590 | Upper Marlboro | 20775 | |
| 591 | Upperco | 21155 | Carroll |
| 592 | Valley Lee | 20692 | St. Mary’s |
| 593 | Vienna | 21869 | Dorchester |
| 594 | Waldorf | 20601 | Charles |
| 595 | Waldorf | 20602 | Charles |
| 596 | Waldorf | 20603 | Charles |
| 597 | Waldorf | 20604 | |
| 598 | Walkersville | 21793 | Frederick |
| 599 | Warwick | 21912 | Cecil |
| 600 | Washington Bulk Mail | 20799 | Prince George’s |
| 601 | Washington Grove | 20880 | |
| 602 | Welcome | 20693 | Charles |
| 603 | Wenona | 21870 | |
| 604 | West Friendship | 21794 | Howard |
| 605 | West River | 20778 | Anne Arundel |
| 606 | Westernport | 21540 | Allegany |
| 607 | Westernport | 21562 | Allegany |
| 608 | Westminster | 21157 | Carroll |
| 609 | Westminster | 21158 | |
| 610 | Westover | 21871 | Somerset |
| 611 | Westover | 21890 | |
| 612 | Whaleysville | 21872 | Worcester |
| 613 | White Hall | 21161 | Harford |
| 614 | White Marsh | 21162 | Baltimore |
| 615 | White Plains | 20695 | Charles |
| 616 | Whiteford | 21160 | Harford |
| 617 | Willards | 21874 | Wicomico |
| 618 | Williamsport | 21795 | Washington |
| 619 | Wingate | 21675 | |
| 620 | Wittman | 21676 | |
| 621 | Woodbine | 21797 | Carroll |
| 622 | Woodsboro | 21798 | Frederick |
| 623 | Woodstock | 21104 | Howard |
| 624 | Woodstock | 21163 | Howard |
| 625 | Woolford | 21677 | Dorchester |
| 626 | Worton | 21678 | Kent |
| 627 | Wye Mills | 21679 | Talbot |