Founded in 1788, Allegheny County is one of 67 counties in the state of Pennsylvania. Historically, Allegheny County was formed from parts of Washington and Westmoreland Counties. The city of Pittsburgh is the county seat. With FIPS code of 3, Allegheny County has a population of 1,238,090 and area of 745 square miles (1,930 km2).
List of all cities in Allegheny County, PA alphabetically
| City/Town | Postal Code | Area Code |
| Allegheny, PA | 15212 | 412/878 |
| Allison Park, PA | 15101 | 412/878 |
| Arsenal, PA | 15201 | 412/878 |
| Aspinwall, PA | 15215 | 412/878 |
| AT & T, PA | 15283 | 412/878 |
| Avalon, PA | 15202 | 412/878 |
| Bairdford, PA | 15006 | 724/878 |
| Bakerstown, PA | 15007 | 724/878 |
| Baldwin, PA | 15234 | 412/878 |
| Baldwin Township, PA | 15234 | 412/878 |
| Beechview, PA | 15216 | 412/878 |
| Bell Telephone Co, PA | 15255 | 412/878 |
| Bellevue, PA | 15202 | 412/878 |
| Bellvue, PA | 15202 | 412/878 |
| Ben Avon, PA | 15202 | 412/878 |
| Ben Avon Heights, PA | 15202 | 412/878 |
| Bethel Park, PA | 15102 | 412/878 |
| Blawnox, PA | 15238 | 412/878 |
| Bloomfield, PA | 15224 | 412/878 |
| Boston, PA | 15135 | 412/878 |
| BRA# 52, PA | 15234 | 412/878 |
| Brackenridge, PA | 15014 | 724/878 |
| Braddock, PA | 15104 | 412/878 |
| Braddock Hills, PA | 15221 | 412/878 |
| Bradfordwoods, PA | 15015 | 724/878 |
| Brentwood, PA | 15227 | 412/878 |
| Bridgeville, PA | 15017 | 412/878 |
| Brookline, PA | 15226 | 412/878 |
| Buena Vista, PA | 15018 | 412/878 |
| Bulk Mail Center, PA | 15095 | 724/878 |
| Bunola, PA | 15020 | 724/878 |
| Carnegie, PA | 15106 | 412/878 |
| Carnegie Mellon University, PA | 15289 | 412/878 |
| Carpolis, PA | 15108 | 412/878 |
| Carson, PA | 15203 | 412/878 |
| Castl Shannon, PA | 15234 | 412/878 |
| Castle Shann, PA | 15234 | 412/878 |
| Castle Shannon, PA | 15234 | 412/878 |
| Cedarhurst, PA | 15243 | 412/878 |
| Cheswick, PA | 15024 | 412/878 |
| Churchill, PA | 15221 | 412/878 |
| Clairton, PA | 15025 | 412/878 |
| Collier Township, PA | 15106 | 412/878 |
| Columbia Gas of Pa, PA | 15270 | 412/878 |
| Coraopolis, PA | 15108 | 412/878 |
| Corliss, PA | 15204 | 412/878 |
| Coropolis, PA | 15108 | 412/878 |
| Coulters, PA | 15028 | 412/878 |
| Crafton, PA | 15205 | 412/878 |
| Creighton, PA | 15030 | 724/878 |
| Crescent, PA | 15046 | 724/878 |
| Cuddy, PA | 15031 | 412/878 |
| Curtisville, PA | 15032 | 724/878 |
| Dormont, PA | 15216 | 412/878 |
| Dravosburg, PA | 15034 | 412/878 |
| Duguesne, PA | 15267 | 412/878 |
| 15110 | 412/878 | |
| Duquesne Light Co, PA | 15279 | 412/878 |
| Duquesne University, PA | 15282 | 412/878 |
| East Liberty, PA | 15206 | 412/878 |
| East McKeesport, PA | 15035 | 412/878 |
| East Pittsburgh, PA | 15112 | 412/878 |
| Eastern Area, PA | 15277 | 412/878 |
| Edgeworth, PA | 15143 | 412/878 |
| Elizabeth, PA | 15037 | 412/878 |
| Emsworth, PA | 15202 | 412/878 |
| Etna, PA | 15223 | 412/878 |
| Floreffe, PA | 15025 | 412/878 |
| Forest Hills, PA | 15221 | 412/878 |
| Fox Chapel, PA | 15238 | 412/878 |
| Gibsonia, PA | 15044 | 724/878 |
| Glassport, PA | 15045 | 412/878 |
| Glenshaw, PA | 15116 | 412/878 |
| Glenwillard, PA | 15046 | 724/878 |
| Greenock, PA | 15047 | 412/878 |
| Greentree, PA | 15242 | 412/878 |
| Harwick, PA | 15049 | 724/878 |
| Hazelwood, PA | 15207 | 412/878 |
| Heidelberg, PA | 15106 | 412/878 |
| Homestead, PA | 15120 | 412/878 |
| Homewood, PA | 15208 | 412/878 |
| Imperial, PA | 15126 | 724/878 |
| Indianola, PA | 15051 | 412/878 |
| Ingomar, PA | 15127 | 412/878 |
| Ingram, PA | 15205 | 412/878 |
| Jefferson Hills, PA | 15025 | 412/878 |
| Kilbuck, PA | 15233 | 412/878 |
| Large, PA | 15025 | 412/878 |
| Leetsdale, PA | 15056 | 724/878 |
| Library, PA | 15129 | 724/878 |
| Macys Dept Store, PA | 15281 | 412/878 |
| McKees Rocks, PA | 15136 | 412/878 |
| McKeesport, PA | 15131 | 412/878 |
| 15132 | 412/878 | |
| 15133 | 412/878 | |
| 15134 | 412/878 | |
| 15135 | 412/878 | |
| McKnight, PA | 15237 | 412/878 |
| Mellon Bank, PA | 15252 | 412/878 |
| 15253 | 412/878 | |
| 15254 | 412/878 | |
| 15257 | 412/878 | |
| 15258 | 412/878 | |
| 15259 | 412/878 | |
| 15286 | 412/878 | |
| Mellon Bank 1, PA | 15262 | 412/878 |
| Millvale, PA | 15209 | 412/878 |
| Monroeville, PA | 15140 | 412/878 |
| Monroeville, PA | 15146 | 412/878 |
| Montour, PA | 15244 | 412/878 |
| Moon Township, PA | 15108 | 412/878 |
| Morgan, PA | 15064 | 412/878 |
| Mount Lebanon, PA | 15228 | 412/878 |
| Mount Oliver, PA | 15210 | 412/878 |
| Mount Washington, PA | 15211 | 412/878 |
| Munhall, PA | 15120 | 412/878 |
| National City Bank, PA | 15278 | 412/878 |
| Natrona Heights, PA | 15065 | 724/878 |
| Neville Island, PA | 15225 | 412/878 |
| Noblestown, PA | 15071 | 724/878 |
| North Versailles, PA | 15137 | 412/878 |
| Oakdale, PA | 15071 | 724/878 |
| Oakland, PA | 15213 | 412/878 |
| Oakmont, PA | 15139 | 412/878 |
| Observatory, PA | 15214 | 412/878 |
| Penn Hills, PA | 15235 | 412/878 |
| Pgh Int Arprt, PA | 15231 | 724/878 |
| Pitcairn, PA | 15140 | 412/878 |
| Pittsburgh, PA | 15122 | 412/878 |
| 15123 | 412/878 | |
| 15201 | 412/878 | |
| 15202 | 412/878 | |
| 15203 | 412/878 | |
| 15204 | 412/878 | |
| 15205 | 412/878 | |
| 15206 | 412/878 | |
| 15207 | 412/878 | |
| 15208 | 412/878 | |
| 15209 | 412/878 | |
| 15210 | 412/878 | |
| 15211 | 412/878 | |
| 15212 | 412/878 | |
| 15213 | 412/878 | |
| 15214 | 412/878 | |
| 15215 | 412/878 | |
| 15216 | 412/878 | |
| 15217 | 412/878 | |
| 15218 | 412/878 | |
| 15219 | 412/878 | |
| 15220 | 412/878 | |
| 15221 | 412/878 | |
| 15222 | 412/878 | |
| 15223 | 412/878 | |
| 15224 | 412/878 | |
| 15225 | 412/878 | |
| 15226 | 412/878 | |
| 15227 | 412/878 | |
| 15228 | 412/878 | |
| 15229 | 412/878 | |
| 15230 | 412/878 | |
| 15231 | 724/878 | |
| 15232 | 412/878 | |
| 15233 | 412/878 | |
| 15234 | 412/878 | |
| 15235 | 412/878 | |
| 15236 | 412/878 | |
| 15237 | 412/878 | |
| 15238 | 412/878 | |
| 15239 | 412/878 | |
| 15240 | 412/878 | |
| 15241 | 412/878 | |
| 15242 | 412/878 | |
| 15243 | 412/878 | |
| 15244 | 412/878 | |
| 15250 | 412/878 | |
| 15251 | 412/878 | |
| 15252 | 412/878 | |
| 15253 | 412/878 | |
| 15254 | 412/878 | |
| 15255 | 412/878 | |
| 15257 | 412/878 | |
| 15258 | 412/878 | |
| 15259 | 412/878 | |
| 15260 | 412/878 | |
| 15261 | 412/878 | |
| 15262 | 412/878 | |
| 15264 | 412/878 | |
| 15265 | 412/878 | |
| 15267 | 412/878 | |
| 15268 | 412/878 | |
| 15270 | 412/878 | |
| 15272 | 412/878 | |
| 15274 | 412/878 | |
| 15275 | 412/878 | |
| 15276 | 412/878 | |
| 15277 | 412/878 | |
| 15278 | 412/878 | |
| 15279 | 412/878 | |
| 15281 | 412/878 | |
| 15282 | 412/878 | |
| 15283 | 412/878 | |
| 15286 | 412/878 | |
| 15289 | 412/878 | |
| 15290 | 412/878 | |
| 15295 | 412/878 | |
| Pleasant Hills, PA | 15236 | 412/878 |
| Plum, PA | 15239 | 412/878 |
| Pnc Bank Pitts, PA | 15265 | 412/878 |
| Port Vue, PA | 15133 | 412/878 |
| Presto, PA | 15142 | 412/878 |
| Rankin, PA | 15104 | 412/878 |
| Rennerdale, PA | 15106 | 412/878 |
| Rook, PA | 15220 | 412/878 |
| Rural Ridge, PA | 15075 | 412/878 |
| Russellton, PA | 15076 | 724/878 |
| Sewickley, PA | 15143 | 412/878 |
| Shadyside, PA | 15232 | 412/878 |
| Sharpsburg, PA | 15215 | 412/878 |
| Soc Auto Engineers, PA | 15096 | 724/878 |
| South Hills, PA | 15216 | 412/878 |
| South Hills Village, PA | 15241 | 412/878 |
| South Park, PA | 15129 | 724/878 |
| Springdale, PA | 15144 | 724/878 |
| Squirrel Hill, PA | 15217 | 412/878 |
| Sturgeon, PA | 15082 | 412/878 |
| Swissvale, PA | 15218 | 412/878 |
| Tarentum, PA | 15084 | 724/878 |
| Turtle Creek, PA | 15145 | 412/878 |
| Universal, PA | 15235 | 412/878 |
| University of Pittsburgh, PA | 15260 | 412/878 |
| 15261 | 412/878 | |
| Upper Saint Clair, PA | 15241 | 412/878 |
| Verona, PA | 15147 | 412/878 |
| Veterans Hospital, PA | 15240 | 412/878 |
| Wabash, PA | 15220 | 412/878 |
| Wall, PA | 15148 | 412/878 |
| Warrendale, PA | 15086 | 724/878 |
| 15095 | 724/878 | |
| 15096 | 724/878 | |
| West Elizabeth, PA | 15088 | 412/878 |
| West Homestead, PA | 15120 | 412/878 |
| West Mifflin, PA | 15122 | 412/878 |
| 15123 | 412/878 | |
| 15236 | 412/878 | |
| West Mifflin Century Mall, PA | 15123 | 412/878 |
| West Mifflin/Pleasant Hills, PA | 15122 | 412/878 |
| 15123 | 412/878 | |
| West View, PA | 15229 | 412/878 |
| Wexford, PA | 15090 | 724/878 |
| Whitaker, PA | 15120 | 412/878 |
| White Oak, PA | 15131 | 412/878 |
| Wildwood, PA | 15091 | 724/878 |
| Wilkinsburg, PA | 15221 | 412/878 |
| Wilmerding, PA | 15148 | 412/878 |