Founded in 1873, Rockwall County is one of 254 counties in the state of Texas. Historically, Rockwall County was formed from Kaufman County. The city of Rockwall is the county seat. With FIPS code of 397, Rockwall County has a population of 116,381 and area of 149 square miles (386 km2).
List of all cities in Rockwall County, TX alphabetically
| City/Town | Postal Code | Area Code |
| Fate, TX | 75132 | 214/469/972 |
| Heath, TX | 75032 | 214/469/972 |
| Rockwall, TX | 75032 | 214/469/972 |
| 75087 | 214/469/972 | |
| Royse City, TX | 75189 | 214/469/972 |