| County | Seat | Year Founded | Area [km2] | Elevation+ [m] | Ogallala Aquifer |
| Andrews | Andrews | 1910 | 3888 | 969 | Marginal |
| Borden | Gail | 1876 | 2347 | 779 | Marginal |
| Cochran | Morton | 1924 | 2007 | 1147 | Yes |
| Crosby | Crosbyton | 1886 | 2336 | 922 | Yes |
| Dawson | Lamesa | 1905 | 2336 | 912 | Yes |
| Gaines | Seminole | 1905 | 3893 | 1005 | Yes |
| Garza | Post | 1907 | 2321 | 794 | Marginal |
| Glasscock | Garden City | 1893 | 2334 | 804 | Marginal |
| Hockley | Levelland | 1921 | 2354 | 1073 | Yes |
| Howard | Big Spring | 1882 | 2341 | 744 | Marginal |
| Lubbock | Lubbock | 1891 | 2334 | 978 | Yes |
| Lynn | Tahoka | 1903 | 2313 | 939 | Yes |
| Martin | Stanton | 1884 | 2372 | 811 | Marginal |
| Midland | Midland | 1885 | 2336 | 847 | Marginal |
| Terry | Brownfield | 1904 | 2308 | 1009 | Yes |
| Yoakum | Plains | 1907 | 2072 | 1111 | Yes |