6 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Raymondville | 1 | 10,065 | 10,240 | -0.35% | 2,446 | 4.12 | City |
| Lyford | 2 | 2,183 | 2,243 | -0.55% | 1,250 | 1.75 | City |
| Sebastian | 3 | 1,116 | 1,508 | -4.53% | 669 | 1.67 | CDP |
| Lasara | 4 | 1,072 | 787 | 0.28% | 742 | 1.45 | CDP |
| San Perlita | 5 | 544 | 534 | 0.37% | 1,048 | 0.52 | City |
| Port Mansfield | 6 | 79 | 127 | -10.23% | 16 | 4.94 | CDP |
Raymondville is the largest city in Willacy County, with a population of 10,065.
Port Mansfield is the smallest city in Willacy County.
There are 6 cities in Willacy County, Texas.