| County | Rank | Change (2020) ↓ | 2026 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Canadian County | 1 | 24.1% | 192,912 | 155,445 |
| McClain County | 2 | 22.12% | 51,182 | 41,910 |
| Wagoner County | 3 | 16.73% | 95,021 | 81,401 |
| Bryan County | 4 | 13.05% | 52,373 | 46,328 |
| Logan County | 5 | 11.23% | 55,338 | 49,752 |
| Grady County | 6 | 9.45% | 60,073 | 54,884 |
| Rogers County | 7 | 8.57% | 103,577 | 95,405 |
| Marshall County | 8 | 7.52% | 16,493 | 15,339 |
| Coal County | 9 | 7.4% | 5,674 | 5,283 |
| Kingfisher County | 10 | 6.94% | 16,230 | 15,177 |
| Lincoln County | 11 | 6.53% | 35,690 | 33,502 |
| Pawnee County | 12 | 6.36% | 16,549 | 15,560 |
| Cherokee County | 13 | 5.84% | 49,841 | 47,092 |
| Tulsa County | 14 | 5.52% | 707,720 | 670,708 |
| Love County | 15 | 4.94% | 10,659 | 10,157 |
| Sequoyah County | 16 | 4.89% | 41,169 | 39,249 |
| Creek County | 17 | 4.61% | 75,169 | 71,857 |
| Le Flore County | 18 | 4.52% | 50,382 | 48,201 |
| McIntosh County | 19 | 4.43% | 19,790 | 18,950 |
| Nowata County | 20 | 4.25% | 9,721 | 9,325 |
| Pottawatomie County | 21 | 4.21% | 75,610 | 72,553 |
| Atoka County | 22 | 4.14% | 14,752 | 14,165 |
| Payne County | 23 | 4.05% | 84,959 | 81,649 |
| Cleveland County | 24 | 3.97% | 308,030 | 296,256 |
| Washington County | 25 | 3.86% | 54,636 | 52,606 |
| Garvin County | 26 | 3.73% | 26,611 | 25,655 |
| Adair County | 27 | 3.72% | 20,181 | 19,458 |
| Mayes County | 28 | 3.68% | 40,490 | 39,053 |
| Osage County | 29 | 3.66% | 47,469 | 45,792 |
| Oklahoma County | 30 | 3.63% | 827,278 | 798,283 |
| Carter County | 31 | 3.45% | 49,697 | 48,041 |
| Delaware County | 32 | 3.4% | 41,763 | 40,390 |
| Craig County | 33 | 2.99% | 14,566 | 14,143 |
| Stephens County | 34 | 2.97% | 44,093 | 42,823 |
| Haskell County | 35 | 2.61% | 11,853 | 11,552 |
| Johnston County | 36 | 2.31% | 10,481 | 10,244 |
| Okfuskee County | 37 | 2% | 11,498 | 11,272 |
| Okmulgee County | 38 | 1.86% | 37,372 | 36,688 |
| Alfalfa County | 39 | 1.79% | 5,814 | 5,712 |
| Washita County | 40 | 1.67% | 11,085 | 10,903 |
| Ottawa County | 41 | 1.16% | 30,580 | 30,229 |
| Jefferson County | 42 | 1.07% | 5,388 | 5,331 |
| Muskogee County | 43 | 1.06% | 66,944 | 66,245 |
| Beckham County | 44 | 0.67% | 22,480 | 22,331 |
| Cotton County | 45 | 0.58% | 5,569 | 5,537 |
| Grant County | 46 | 0.38% | 4,193 | 4,177 |
| Noble County | 47 | 0.33% | 10,958 | 10,922 |
| Woods County | 48 | 0.27% | 8,626 | 8,603 |
| Hughes County | 49 | -0.34% | 13,301 | 13,346 |
| Pontotoc County | 50 | -0.46% | 37,918 | 38,094 |
| Comanche County | 51 | -0.57% | 120,452 | 121,144 |
| Murray County | 52 | -0.62% | 13,792 | 13,878 |
| Latimer County | 53 | -0.83% | 9,405 | 9,484 |
| Blaine County | 54 | -0.88% | 8,625 | 8,702 |
| Pushmataha County | 55 | -0.97% | 10,688 | 10,793 |
| Harper County | 56 | -1.08% | 3,213 | 3,248 |
| Custer County | 57 | -1.09% | 28,134 | 28,444 |
| McCurtain County | 58 | -1.11% | 30,501 | 30,844 |
| Beaver County | 59 | -1.13% | 4,971 | 5,028 |
| Kay County | 60 | -1.24% | 43,069 | 43,611 |
| Pittsburg County | 61 | -1.25% | 43,241 | 43,787 |
| Garfield County | 62 | -1.26% | 61,911 | 62,701 |
| Caddo County | 63 | -1.49% | 26,505 | 26,905 |
| Jackson County | 64 | -2% | 24,253 | 24,747 |
| Choctaw County | 65 | -2.34% | 13,874 | 14,207 |
| Seminole County | 66 | -2.68% | 22,883 | 23,512 |
| Texas County | 67 | -2.74% | 20,707 | 21,291 |
| Woodward County | 68 | -2.89% | 19,827 | 20,418 |
| Greer County | 69 | -3.2% | 5,317 | 5,493 |
| Major County | 70 | -3.72% | 7,461 | 7,749 |
| Dewey County | 71 | -3.91% | 4,298 | 4,473 |
| Kiowa County | 72 | -4.34% | 8,127 | 8,496 |
| Roger Mills County | 73 | -5.19% | 3,250 | 3,428 |
| Ellis County | 74 | -5.79% | 3,529 | 3,746 |
| Tillman County | 75 | -6.76% | 6,474 | 6,943 |
| Cimarron County | 76 | -11.66% | 2,023 | 2,290 |
| Harmon County | 77 | -14.06% | 2,127 | 2,475 |
Oklahoma's counties show varied growth patterns from 2020 to 2026. Canadian County leads with 3.66% annualized growth, followed by McClain County (3.39%) and Wagoner County (2.61%). The largest counties are Oklahoma County (827,278), Tulsa County (707,720), and Cleveland County (308,030). Of the 77 counties in Oklahoma, 48 are growing while 29 have experienced population decline. Overall, counties averaged 0.33% annualized growth, with total population growing by 0.8% annually.
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