Member Municipalities
and Codes
| Ada | 6205 | Drumright | 1915 | Madill | 4810 | Sand Springs | 7235 |
| Altus | 3305 | Duncan | 6910 | Mangum | 2815 | Sapulpa | 1945 |
| Alva | 7605 | Durant | 0735 | Mannford | 1930 | Sawyer | 1230 |
| Anadarko | 0805 | Edmond | 5520 | Marlow | 6920 | Sayre | 0520 |
| Arapaho | 2005 | El Reno | 0910 | McAlester | 6150 | Seminole | 6720 |
| Ardmore | 1005 | Elk City | 0510 | Miami | 5820 | Shawnee | 6335 |
| Atoka | 0305 | Enid | 2425 | Midwest City | 5555 | Skiatook | 7270 |
| Bartlesville | 7405 | Eufaula | 4610 | Moore | 1410 | Spencer | 5580 |
| Bethany | 5505 | Forest Park | 5525 | Muskogee | 5130 | Stigler | 3120 |
| Bixby | 7205 | Fort Gibson | 5120 | Mustang | 0915 | Stillwater | 6025 |
| Blackwell | 3605 | Frederick | 7110 | Newcastle | 4435 | Sulphur | 5015 |
| Blair | 3310 | Garber | 2435 | Newkirk | 3630 | Tahlequah | 1115 |
| Boynton | 5105 | Glenpool | 7220 | Nichols Hills | 5560 | Tecumseh | 6340 |
| Bristow | 1905 | Grandfield | 7115 | Nicoma Park | 5565 | The Village | 5590 |
| Broken Arrow | 7260 | Granite | 2810 | Noble | 1415 | Tishomingo | 3530 |
| Catoosa | 6605 | Grove | 2115 | Norman | 1420 | Tonkawa | 3640 |
| Chandler | 4115 | Guthrie | 4215 | Nowata | 5315 | Tulsa | 7250 |
| Checotah | 4605 | Guymon | 7010 | Okeene | 0630 | Tuttle | 2630 |
| Chickasha | 2615 | Harrah | 5530 | Oklahoma City | 5570 | Valley Brook | 5585 |
| Choctaw | 5510 | Haskell | 5125 | Okmulgee | 5640 | Vinita | 1820 |
| Claremore | 6615 | Henryetta | 5625 | Owasso | 7230 | Warner | 5155 |
| Cleveland | 5910 | Hinton | 0855 | Pauls Valley | 2525 | Warr Acres | 5595 |
| Clinton | 2015 | Hobart | 3815 | Pawhuska | 5745 | Watonga | 0635 |
| Collinsville | 7215 | Hominy | 5735 | Perkins | 6015 | Waurika | 3435 |
| Commerce | 5810 | Hugo | 1215 | Perry | 5220 | Weatherford | 2030 |
| Coweta | 7305 | Idabel | 4520 | Piedmont | 0920 | Weleetka | 5425 |
| Cromwell | 6705 | Jenks | 7225 | Ponca City | 3635 | Wetumka | 3235 |
| Cushing | 6005 | Jones | 5535 | Poteau | 4040 | Wewoka | 6725 |
| Davis | 5005 | Kingfisher | 3715 | Prague | 4140 | Wister | 4055 |
| Del City | 5515 | Krebs | 6145 | Pryor | 4935 | Woodward | 7730 |
| Dewey | 7415 | Lawton | 1640 | Purcell | 4415 | Yukon | 0930 |
| Disney | 4915 | Lexington | 1405 | Ringling | 3415 | ||
| Drummond | 2420 | Lindsay | 2510 | Sallisaw | 6835 | ||