Founded in 1911, Willacy County is one of 254 counties in the state of Texas. Historically, Willacy County was formed from Cameron County and Hidalgo County. The city of Raymondville is the county seat. With FIPS code of 489, Willacy County has a population of 20,316 and area of 597 square miles (1,546 km2).
List of all cities in Willacy County, TX alphabetically
| City/Town | Postal Code | Area Code |
| Lasara, TX | 78561 | 956 |
| Los Coyotes, TX | 78569 | 956 |
| Lyford, TX | 78569 | 956 |
| Porfirio, TX | 78580 | 956 |
| Port Mansfield, TX | 78598 | 956 |
| Prt Mansfield, TX | 78598 | 956 |
| Raymondville, TX | 78580 | 956 |
| 78598 | 956 | |
| San Perlita, TX | 78590 | 956 |
| Santa Monica, TX | 78580 | 956 |
| Sebastian, TX | 78594 | 956 |
| Stockholm, TX | 78569 | 956 |
| Willamar, TX | 78580 | 956 |