| COUNTY | CODE | District |
| Adair | 40001 | Eastern |
| Alfalfa | 40003 | Western |
| Atoka | 40005 | Eastern |
| Beaver | 40007 | Western |
| Beckham | 40009 | Western |
| Blaine | 40011 | Western |
| Bryan | 40013 | Eastern |
| Caddo | 40015 | Western |
| Canadian | 40017 | Western |
| Carter | 40019 | Eastern |
| Cherokee | 40021 | Eastern |
| Choctaw | 40023 | Eastern |
| Cimarron | 40025 | Western |
| Cleveland | 40027 | Western |
| Coal | 40029 | Eastern |
| Comanche | 40031 | Western |
| Cotton | 40033 | Western |
| Craig | 40035 | Northern |
| Creek | 40037 | Northern |
| Custer | 40039 | Western |
| Delaware | 40041 | Northern |
| Dewey | 40043 | Western |
| Ellis | 40045 | Western |
| Garfield | 40047 | Western |
| Garvin | 40049 | Western |
| Grady | 40051 | Western |
| Grant | 40053 | Western |
| Greer | 40055 | Western |
| Harmon | 40057 | Western |
| Harper | 40059 | Western |
| Haskell | 40061 | Eastern |
| Hughes | 40063 | Eastern |
| Jackson | 40065 | Western |
| Jefferson | 40067 | Western |
| Johnston | 40069 | Eastern |
| Kay | 40071 | Western |
| Kingfisher | 40073 | Western |
| Kiowa | 40075 | Western |
| Latimer | 40077 | Eastern |
| LeFlore | 40079 | Eastern |
| Lincoln | 40081 | Western |
| Logan | 40083 | Western |
| Love | 40085 | Eastern |
| McClain | 40087 | Western |
| McCurtain | 40089 | Eastern |
| McIntosh | 40091 | Eastern |
| Major | 40093 | Western |
| Marshall | 40095 | Eastern |
| Mayes | 40097 | Northern |
| Murray | 40099 | Eastern |
| Muskogee | 40101 | Eastern |
| Noble | 40103 | Western |
| Nowata | 40105 | Northern |
| Okfuskee | 40107 | Eastern |
| Oklahoma | 40109 | Western |
| Okmulgee | 40111 | Eastern |
| Osage | 40113 | Northern |
| Ottawa | 40115 | Northern |
| Pawnee | 40117 | Northern |
| Payne | 40119 | Western |
| Pittsburg | 40121 | Eastern |
| Pontotoc | 40123 | Eastern |
| Pottawatomie | 40125 | Western |
| Pushmataha | 40127 | Eastern |
| Roger Mills | 40129 | Western |
| Rogers | 40131 | Northern |
| Seminole | 40133 | Eastern |
| Sequoyah | 40135 | Eastern |
| Stephens | 40137 | Western |
| Texas | 40139 | Western |
| Tillman | 40141 | Western |
| Tulsa | 40143 | Northern |
| Wagoner | 40145 | Eastern |
| Washington | 40147 | Northern |
| Washita | 40149 | Western |
| Woods | 40151 | Western |
| Woodward | 40153 | Western |
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