| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Raymondville | 1 | 10,068 | 10,191 | -0.14% | 2,447 | 4 | City |
| Lyford | 2 | 2,200 | 2,271 | -0.45% | 1,260 | 2 | City |
| San Perlita | 3 | 546 | 540 | 0.18% | 1,052 | 1 | City |
Raymondville is the largest city in Willacy County, with a population of 10,068.
San Perlita is the smallest city in Willacy County, with a population of 546.
There are 3 cities in Willacy County, Texas.