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| Austin-area cohort includes the following counties in its service area (with no additional fee for field support): | |||
| Travis | Bastrop | Blanco | Burnet |
| Caldwell | Comal | Fayette | Gillespie |
| Gonzales | Guadalupe | Hays | Kendall |
| Lee | Llano | Milam | Williamson |
| Abilene cohort includes the following counties in its service area (with no additional fee for field support): | |||
| Callahan | Coke | Coleman | Fisher |
| Jones | Nolan | Runnels | Shackelford |
| Taylor | |||
| Denton cohort includes the following counties in its service area (with no additional fee for field support): | |||
| Denton | Collin | Cooke | Dallas |
| Grayson | Montague | Parker | Rockwall |
| Tarrant | Wise | ||
| East Houston cohort includes the following counties in its service area (with no additional fee for field support): | |||
| Harris | Chambers | Galveston | Liberty |
| El Paso cohort includes the following counties in its service area (with no additional fee for field support): | |||
| El Paso | |||
| Huntsville cohort includes the following counties in its service area (with no additional fee for field support): | |||
| Grimes | Houston | Madison | Montgomery |
| Polk | San Jacinto | Trinity | Walker |
| Lower Rio Grande Valley cohort includes the following counties in its service area (with no additional fee for field support): | |||
| Hidalgo | Cameron | Starr | Willacy |
| Lubbock cohort includes the following counties in its service area (with no additional fee for field support): | |||
| Lubbock | Crosby | Floyd | Garza |
| Hale | Hockley | Lamb | Lynn |
| Terry | |||
| Mt. Pleasant cohort includes the following counties in its service area (with no additional fee for field support): | |||
| Titus | Bowie | Camp | Cass |
| Delta | Franklin | Gregg | Harrison |
| Hopkins | Lamar | Marion | Morris |
| Red River | Upshur | Wood | |
| San Angelo cohort includes the following counties in its service area (with no additional fee for field support): | |||
| Tom Green | Coke | Concho | Irion |
| Menard | Runnels | Schliecher | Sterling |
| Silsbee cohort includes the following counties in its service area (with no additional fee for field support): | |||
| Hardin | Jasper | Jefferson | Liberty |
| Newton | Orange | Tyler | |
