Founded in 1846, Collin County is one of 254 counties in the state of Texas. Historically, Collin County was formed from Fannin County. The city of McKinney is the county seat. With FIPS code of 85, Collin County has a population of 1,109,462 and area of 848 square miles (2,196 km2).
List of all cities in Collin County, TX alphabetically
| City/Town | Postal Code | Area Code |
| Allen, TX | 75002 | 214/469/972 |
| 75013 | 214/469/972 | |
| Anna, TX | 75409 | 214/469/972 |
| Blue Ridge, TX | 75424 | 214/469/972 |
| Celina, TX | 75009 | 214/469/972 |
| Copeville, TX | 75121 | 214/469/972 |
| Dallas, TX | 75252 | 214/469/972 |
| 75287 | 214/469/972 | |
| Fairview, TX | 75069 | 214/469/972 |
| Farmersville, TX | 75442 | 214/469/972 |
| Frisco, TX | 75035 | 214/469/972 |
| Josephine, TX | 75164 | 214/469/972 |
| Lavon, TX | 75166 | 214/469/972 |
| Lucas, TX | 75002 | 214/469/972 |
| McKinney, TX | 75069 | 214/469/972 |
| 75070 | 214/469/972 | |
| 75071 | 214/469/972 | |
| Melissa, TX | 75071 | 214/469/972 |
| 75454 | 214/469/972 | |
| Murphy, TX | 75074 | 214/469/972 |
| 75094 | 214/469/972 | |
| Nevada, TX | 75173 | 214/469/972 |
| Plano, TX | 75023 | 214/469/972 |
| 75024 | 214/469/972 | |
| 75025 | 214/469/972 | |
| 75026 | 214/469/972 | |
| 75074 | 214/469/972 | |
| 75075 | 214/469/972 | |
| 75086 | 214/469/972 | |
| 75093 | 214/469/972 | |
| 75094 | 214/469/972 | |
| Prestonwood, TX | 75252 | 214/469/972 |
| Princeton, TX | 75407 | 214/469/972 |
| Prosper, TX | 75078 | 214/469/972 |
| Saint Paul, TX | 75098 | 214/469/972 |
| Westminster, TX | 75485 | 214/469/972 |
| Weston, TX | 75097 | 214/469/972 |
| Wylie, TX | 75098 | 214/469/972 |