| | | Randall County | TX | 48381 | | Amarillo, TX 11100 | Amarillo-Borger, TX 108 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=RandallCounty+TX |
| | | Reagan County | TX | 48383 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=ReaganCounty+TX |
| | | Real County | TX | 48385 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=RealCounty+TX |
| | | Red River County | TX | 48387 | | Paris, TX 37580 | | Outlying | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=RedRiverCounty+TX |
| | | Reeves County | TX | 48389 | | Town of Pecos, TX 45880 | | Central | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=ReevesCounty+Texas |
| | | Refugio County | TX | 48391 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=RefugioCounty+TX |
| | | Roberts County | TX | 48393 | | Pampa, TX 37420 | | Outlying | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=RobertsCounty+TX |
| | | Robertson County | TX | 48395 | | College Station-Bryan, TX 17780 | | Outlying | metro county (urban) | mining-dependent | https://maps.google.com/?q=RobertsonCounty+TX |
| | | Rockwall County | TX | 48397 | Dallas-Plano-Irving, TX 19124 | Dallas-Fort
Worth-Arlington, TX 19100 | Dallas-Fort Worth, TX-OK 206 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=RockwallCounty+TX |
| | | Runnels County | TX | 48399 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=RunnelsCounty+TX |
