| County/ City | Population 1980 | Population 1990 | Percent Change 1980-1990 | Population 2000 | Percent Change 1990-2000 |
|---|---|---|---|---|---|
| Willacy County | 17,495 | 17,705 | 1.2 | 20,082 | 13.4 |
| Layford | 1,618 | 1,674 | 3.5 | 1,973 | 17.9 |
| Raymondville | 9,493 | 8,880 | -6.5 | 9,733 | 9.6 |
| San Perlita | 475 | 512 | 7.8 | 680 | 32.8 |
| Sebastian CDP | - | 1,598 | - | 1,864 | 16.6 |