| County | Rank | Change (2020) ↓ | 2026 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Canadian County | 1 | 24% | 192,734 | 155,435 |
| McClain County | 2 | 21.09% | 50,764 | 41,922 |
| Wagoner County | 3 | 16.99% | 95,217 | 81,390 |
| Logan County | 4 | 14.46% | 56,949 | 49,753 |
| Bryan County | 5 | 12.88% | 52,294 | 46,326 |
| Grady County | 6 | 9.24% | 59,958 | 54,889 |
| Rogers County | 7 | 8.21% | 103,224 | 95,395 |
| Love County | 8 | 7.89% | 10,961 | 10,159 |
| Marshall County | 9 | 6.65% | 16,360 | 15,340 |
| Lincoln County | 10 | 6.09% | 35,556 | 33,515 |
| Creek County | 11 | 5.79% | 76,005 | 71,843 |
| Cherokee County | 12 | 5.4% | 49,627 | 47,085 |
| Le Flore County | 13 | 5.26% | 50,745 | 48,209 |
| Sequoyah County | 14 | 5.22% | 41,287 | 39,239 |
| Kingfisher County | 15 | 4.9% | 15,913 | 15,170 |
| Tulsa County | 16 | 4.8% | 702,882 | 670,681 |
| McIntosh County | 17 | 4.44% | 19,790 | 18,948 |
| Delaware County | 18 | 4.43% | 42,171 | 40,381 |
| Pottawatomie County | 19 | 4.4% | 75,729 | 72,540 |
| Mayes County | 20 | 4.21% | 40,698 | 39,054 |
| Atoka County | 21 | 3.72% | 14,691 | 14,164 |
| Stephens County | 22 | 3.64% | 44,395 | 42,835 |
| Oklahoma County | 23 | 3.48% | 826,052 | 798,252 |
| Johnston County | 24 | 3.21% | 10,571 | 10,242 |
| Garvin County | 25 | 3.15% | 26,455 | 25,648 |
| Pawnee County | 26 | 3.02% | 16,022 | 15,553 |
| Payne County | 27 | 2.98% | 84,082 | 81,647 |
| Washington County | 28 | 2.98% | 54,181 | 52,613 |
| Craig County | 29 | 2.93% | 14,562 | 14,147 |
| Cleveland County | 30 | 2.8% | 304,545 | 296,253 |
| Coal County | 31 | 2.63% | 5,415 | 5,276 |
| Adair County | 32 | 2.59% | 19,952 | 19,449 |
| Okfuskee County | 33 | 2.47% | 11,550 | 11,272 |
| Latimer County | 34 | 2.36% | 9,701 | 9,477 |
| Jefferson County | 35 | 2.35% | 5,440 | 5,315 |
| Osage County | 36 | 2.18% | 46,797 | 45,799 |
| Nowata County | 37 | 2.09% | 9,518 | 9,323 |
| Haskell County | 38 | 1.72% | 11,752 | 11,553 |
| Okmulgee County | 39 | 1.72% | 37,319 | 36,688 |
| Pontotoc County | 40 | 1.63% | 38,713 | 38,091 |
| Carter County | 41 | 1.27% | 48,652 | 48,040 |
| Comanche County | 42 | 1.26% | 122,674 | 121,150 |
| Hughes County | 43 | 0.87% | 13,464 | 13,348 |
| Ottawa County | 44 | 0.68% | 30,447 | 30,240 |
| Jackson County | 45 | 0.67% | 24,901 | 24,735 |
| Muskogee County | 46 | 0.63% | 66,636 | 66,222 |
| Washita County | 47 | 0.41% | 10,948 | 10,903 |
| Seminole County | 48 | 0.05% | 23,528 | 23,516 |
| Noble County | 49 | -0.32% | 10,890 | 10,925 |
| Pushmataha County | 50 | -0.36% | 10,754 | 10,793 |
| McCurtain County | 51 | -0.43% | 30,710 | 30,844 |
| Kay County | 52 | -0.6% | 43,343 | 43,605 |
| Murray County | 53 | -0.86% | 13,753 | 13,873 |
| Beckham County | 54 | -0.87% | 22,132 | 22,326 |
| Custer County | 55 | -1.05% | 28,149 | 28,448 |
| Pittsburg County | 56 | -1.42% | 43,169 | 43,792 |
| Garfield County | 57 | -1.89% | 61,514 | 62,699 |
| Choctaw County | 58 | -2.2% | 13,892 | 14,205 |
| Blaine County | 59 | -2.25% | 8,508 | 8,704 |
| Alfalfa County | 60 | -2.38% | 5,577 | 5,713 |
| Tillman County | 61 | -2.71% | 6,762 | 6,950 |
| Major County | 62 | -3.01% | 7,514 | 7,747 |
| Harper County | 63 | -3.02% | 3,148 | 3,246 |
| Cotton County | 64 | -3.14% | 5,366 | 5,540 |
| Woodward County | 65 | -3.18% | 19,752 | 20,401 |
| Woods County | 66 | -3.22% | 8,321 | 8,598 |
| Greer County | 67 | -3.4% | 5,306 | 5,493 |
| Caddo County | 68 | -3.43% | 25,981 | 26,903 |
| Beaver County | 69 | -3.56% | 4,849 | 5,028 |
| Ellis County | 70 | -3.66% | 3,605 | 3,742 |
| Grant County | 71 | -4.4% | 4,002 | 4,186 |
| Kiowa County | 72 | -4.63% | 8,103 | 8,496 |
| Texas County | 73 | -5.12% | 20,201 | 21,291 |
| Roger Mills County | 74 | -5.83% | 3,231 | 3,431 |
| Harmon County | 75 | -6.34% | 2,319 | 2,476 |
| Dewey County | 76 | -7.44% | 4,143 | 4,476 |
| Cimarron County | 77 | -12.68% | 1,997 | 2,287 |
Oklahoma's counties show varied growth patterns from 2020 to 2026. Canadian County leads with 3.65% annualized growth, followed by McClain County (3.24%) and Wagoner County (2.65%). The largest counties are Oklahoma County (826,052), Tulsa County (702,882), and Cleveland County (304,545). Of the 77 counties in Oklahoma, 48 are growing while 29 have experienced population decline. Overall, counties averaged 0.28% annualized growth, with total population growing by 0.76% annually.
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