Founded in 1792, Onondaga County is one of 62 counties in the state of New York. Historically, Onondaga County was formed from Herkimer County. The city of Syracuse is the county seat. With FIPS code of 67, Onondaga County has a population of 473,236 and area of 806 square miles (2,088 km2).
List of all cities in Onondaga County, NY alphabetically
| City/Town | Postal Code | Area Code |
| Amber, NY | 13110 | 315 |
| Apulia Station, NY | 13020 | 315 |
| Baldwinsville, NY | 13027 | 315 |
| Bayberry, NY | 13090 | 315 |
| Belgium, NY | 13027 | 315 |
| Berwyn, NY | 13084 | 315 |
| Brewerton, NY | 13029 | 315 |
| Bridgeport, NY | 13030 | 315 |
| Caller Firms, NY | 13250 | 315 |
| Camillus, NY | 13031 | 315 |
| Cardiff, NY | 13084 | 315 |
| Carousel Center, NY | 13290 | 315 |
| Cicero, NY | 13039 | 315 |
| Clay, NY | 13041 | 315 |
| Colvin, NY | 13205 | 315 |
| Colvin Elmwood, NY | 13205 | 315 |
| 13207 | 315 | |
| Cross Lake, NY | 13080 | 315 |
| De Witt, NY | 13214 | 315 |
| Delphi Falls, NY | 13051 | 315 |
| Dewitt, NY | 13214 | 315 |
| Dominion Park, NY | 13090 | 315 |
| East Syracuse, NY | 13057 | 315 |
| Eastwood, NY | 13206 | 315 |
| Elbridge, NY | 13060 | 315 |
| Elmwood, NY | 13207 | 315 |
| Fabius, NY | 13063 | 315 |
| Fayetteville, NY | 13066 | 315 |
| Firms, NY | 13251 | 315 |
| Galeville, NY | 13088 | 315 |
| Geddes, NY | 13209 | 315 |
| Hart Lot, NY | 13060 | 315 |
| Howlett Hill, NY | 13031 | 315 |
| Indian Village, NY | 13120 | 315 |
| Jamesville, NY | 13078 | 315 |
| Jewell Manor, NY | 13088 | 315 |
| Jordan, NY | 13080 | 315 |
| Kirkville, NY | 13082 | 315 |
| La Fayette, NY | 13084 | 315 |
| Lafayette, NY | 13084 | 315 |
| Liverpool, NY | 13088 | 315 |
| 13089 | 315 | |
| 13090 | 315 | |
| Lyncourt, NY | 13208 | 315 |
| Lysander, NY | 13027 | 315 |
| Mandana, NY | 13152 | 315 |
| Manlius, NY | 13104 | 315 |
| Marcellus, NY | 13108 | 315 |
| Marcellus Falls, NY | 13108 | 315 |
| Marietta, NY | 13110 | 315 |
| Martisco, NY | 13108 | 315 |
| Mattydale, NY | 13211 | 315 |
| Mdale, NY | 13211 | 315 |
| Memphis, NY | 13112 | 315 |
| Minoa, NY | 13116 | 315 |
| Mottville, NY | 13119 | 315 |
| National Grid, NY | 13252 | 315 |
| Navarino, NY | 13108 | 315 |
| Nedrow, NY | 13120 | 315 |
| Niles, NY | 13152 | 315 |
| North Syracuse, NY | 13212 | 315 |
| Onon Hill, NY | 13215 | 315 |
| Onondaga Nation, NY | 13120 | 315 |
| Otisco, NY | 13159 | 315 |
| Otisco Valley, NY | 13110 | 315 |
| Plainville, NY | 13137 | 315 |
| Pompey, NY | 13138 | 315 |
| Radison, NY | 13027 | 315 |
| Radisson, NY | 13027 | 315 |
| Rockwell Springs, NY | 13120 | 315 |
| Salina, NY | 13088 | 315 |
| Sentinel Heights, NY | 13078 | 315 |
| Skaneateles, NY | 13152 | 315 |
| Skaneateles Falls, NY | 13119 | 315 |
| 13153 | 315 | |
| Solvay, NY | 13209 | 315 |
| South Onondaga, NY | 13120 | 315 |
| Split Rock, NY | 13031 | 315 |
| Syracuse, NY | 13201 | 315 |
| 13202 | 315 | |
| 13203 | 315 | |
| 13204 | 315 | |
| 13205 | 315 | |
| 13206 | 315 | |
| 13207 | 315 | |
| 13208 | 315 | |
| 13209 | 315 | |
| 13210 | 315 | |
| 13211 | 315 | |
| 13212 | 315 | |
| 13214 | 315 | |
| 13215 | 315 | |
| 13217 | 315 | |
| 13218 | 315 | |
| 13219 | 315 | |
| 13220 | 315 | |
| 13221 | 315 | |
| 13224 | 315 | |
| 13225 | 315 | |
| 13235 | 315 | |
| 13244 | 315 | |
| 13250 | 315 | |
| 13251 | 315 | |
| 13252 | 315 | |
| 13261 | 315 | |
| 13290 | 315 | |
| Syracuse Amf, NY | 13225 | 315 |
| Syracuse University, NY | 13244 | 315 |
| Taunton, NY | 13219 | 315 |
| Tully, NY | 13159 | 315 |
| University, NY | 13235 | 315 |
| Van Buren, NY | 13027 | 315 |
| Vesper, NY | 13159 | 315 |
| Warners, NY | 13164 | 315 |
| Westvale, NY | 13219 | 315 |