Founded in 1659, Baltimore County is one of 23 counties in the state of Maryland. Historically, Baltimore County was formed from unorganized territory. The city of Towson is the county seat. With FIPS code of 5, Baltimore County has a population of 849,316 and area of 682 square miles (1,766 km2).
List of all cities in Baltimore County, MD alphabetically
| City/Town | Postal Code | Area Code |
| Arbutus, MD | 21227 | 410/443/667 |
| Baldwin, MD | 21013 | 410/443/667 |
| Baltimore, MD | 21204 | 410/443/667 |
| 21207 | 410/443/667 | |
| 21208 | 410/443/667 | |
| 21219 | 410/443/667 | |
| 21220 | 410/443/667 | |
| 21221 | 410/443/667 | |
| 21222 | 410/443/667 | |
| 21227 | 410/443/667 | |
| 21228 | 410/443/667 | |
| 21234 | 410/443/667 | |
| 21236 | 410/443/667 | |
| 21237 | 410/443/667 | |
| 21244 | 410/443/667 | |
| 21250 | 410/443/667 | |
| 21252 | 410/443/667 | |
| 21260 | 410/443/667 | |
| 21282 | 410/443/667 | |
| 21284 | 410/443/667 | |
| 21285 | 410/443/667 | |
| 21286 | 410/443/667 | |
| Bentley Springs, MD | 21120 | 410/443/667 |
| Boring, MD | 21020 | 410/443/667 |
| Bradshaw, MD | 21087 | 410/443/667 |
| Brooklandville, MD | 21022 | 410/443/667 |
| Butler, MD | 21023 | 410/443/667 |
| Catonsville, MD | 21228 | 410/443/667 |
| 21250 | 410/443/667 | |
| Census Bureau, MD | 21260 | 410/443/667 |
| Chase, MD | 21027 | 410/443/667 |
| Cockeysville, MD | 21030 | 410/443/667 |
| Cockeysville Hunt Valley, MD | 21065 | 410/443/667 |
| Cockys Ht Valley, MD | 21065 | 410/443/667 |
| Cockysvil, MD | 21030 | 410/443/667 |
| Dundalk, MD | 21222 | 410/443/667 |
| Dundalk Sparrows Point, MD | 21219 | 410/443/667 |
| 21222 | 410/443/667 | |
| Edgemere, MD | 21219 | 410/443/667 |
| Essex, MD | 21221 | 410/443/667 |
| Eudowood, MD | 21204 | 410/443/667 |
| Fork, MD | 21051 | 410/443/667 |
| Fort Howard, MD | 21052 | 410/443/667 |
| Fowbelsburg, MD | 21155 | 410/443/667 |
| Foxridge, MD | 21133 | 410/443/667 |
| Freeland, MD | 21053 | 410/443/667 |
| Garrison, MD | 21117 | 410/443/667 |
| Glen Arm, MD | 21057 | 410/443/667 |
| Glencoe, MD | 21152 | 410/443/667 |
| Glyndon, MD | 21071 | 410/443/667 |
| 21136 | 410/443/667 | |
| Gwynn Oak, MD | 21207 | 410/443/667 |
| Halethorpe, MD | 21227 | 410/443/667 |
| Hereford, MD | 21111 | 410/443/667 |
| Hunt Valley, MD | 21030 | 410/443/667 |
| 21031 | 410/443/667 | |
| 21065 | 410/443/667 | |
| Hydes, MD | 21082 | 410/443/667 |
| Jacksonville, MD | 21131 | 410/443/667 |
| Kingsville, MD | 21087 | 410/443/667 |
| Lansdowne, MD | 21227 | 410/443/667 |
| Loch Raven, MD | 21204 | 410/443/667 |
| 21284 | 410/443/667 | |
| 21286 | 410/443/667 | |
| Long Green, MD | 21092 | 410/443/667 |
| Lutherville, MD | 21093 | 410/443/667 |
| 21094 | 410/443/667 | |
| Lutherville Timonium, MD | 21093 | 410/443/667 |
| 21094 | 410/443/667 | |
| Maryland Line, MD | 21105 | 410/443/667 |
| McDonogh Run, MD | 21133 | 410/443/667 |
| Middle River, MD | 21220 | 410/443/667 |
| Monkton, MD | 21111 | 410/443/667 |
| Nottingham, MD | 21236 | 410/443/667 |
| Owings Mills, MD | 21117 | 410/443/667 |
| Parkton, MD | 21120 | 410/443/667 |
| Parkville, MD | 21234 | 410/443/667 |
| Pdp Group Inc, MD | 21065 | 410/443/667 |
| Perry Hall, MD | 21128 | 410/443/667 |
| Perryhall, MD | 21128 | 410/443/667 |
| Phoenix, MD | 21131 | 410/443/667 |
| Pikesville, MD | 21208 | 410/443/667 |
| 21282 | 410/443/667 | |
| Pikesville Finance, MD | 21282 | 410/443/667 |
| Randallstown, MD | 21133 | 410/443/667 |
| Reisterstown, MD | 21071 | 410/443/667 |
| 21136 | 410/443/667 | |
| Riderwood, MD | 21139 | 410/443/667 |
| Rosedale, MD | 21237 | 410/443/667 |
| Ruxton, MD | 21204 | 410/443/667 |
| Sparks, MD | 21152 | 410/443/667 |
| Sparks Glencoe, MD | 21152 | 410/443/667 |
| Sparrows Point, MD | 21219 | 410/443/667 |
| Stevenson, MD | 21153 | 410/443/667 |
| Timonium, MD | 21093 | 410/443/667 |
| 21094 | 410/443/667 | |
| Towson, MD | 21204 | 410/443/667 |
| 21252 | 410/443/667 | |
| 21284 | 410/443/667 | |
| 21285 | 410/443/667 | |
| 21286 | 410/443/667 | |
| Towson Finance, MD | 21285 | 410/443/667 |
| Towson State University, MD | 21252 | 410/443/667 |
| University of Md Baltimore County, MD | 21250 | 410/443/667 |
| Upper Falls, MD | 21156 | 410/443/667 |
| Upperco, MD | 21155 | 410/443/667 |
| White Marsh, MD | 21162 | 410/443/667 |
| Windsor Mill, MD | 21244 | 410/443/667 |
| Woodlawn, MD | 21207 | 410/443/667 |