Last official estimated population of McClain County was 34,731 (year 2014)[1]. This was 0.011% of total US population and 0.9% of total Oklahoma state population. Area of McClain County is 580.3 mi² (=1502.8 km²), in this year population density was 59.85 p/mi². If population growth rate would be same as in period 2010-2014 (+0.16%/yr), McClain County population in 2026 would be 35,415 [0].
Historical population of McClain County for period 1880-2014 [1] , [2] , [3]:
Estimated population for 2014[1]. Population density is in p./sq.mi [4]. Changes are for period 2010-2015. Value is %/year. Boundary lines are approx. 2012 [5]. Click on flag to hide it.
Population • Density • Changes • Legends • Position

[1880-1890] NAN %/yr
[1890-1900] +INF %/yr
[1900-1910] +1.97 %/yr
[1910-1920] +2.13 %/yr
[1920-1930] +1.11 %/yr
[1930-1940] -1.16 %/yr
[1940-1950] -2.65 %/yr
[1950-1960] -1.41 %/yr
[1960-1970] +1.06 %/yr
[1970-1980] +3.67 %/yr
[1980-1990] +1.17 %/yr
[1990-2000] +1.99 %/yr
[2000-2005] +1.79 %/yr
[2005-2010] +2.62 %/yr
[2010-2014] +0.16 %/yr
Looking for settlements in McClain County? Visit this page: Settlements in McClain County, OK
Population of McClain County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1196 | 1159 | 2,355 |
| 5 to 9 | 1422 | 1413 | 2,835 |
| 10 to 14 | 1444 | 1361 | 2,805 |
| 15 to 19 | 1346 | 1188 | 2,534 |
| 20 to 24 | 1047 | 988 | 2,035 |
| 25 to 29 | 1005 | 1028 | 2,033 |
| 30 to 34 | 1181 | 1257 | 2,438 |
| 35 to 39 | 1172 | 1243 | 2,415 |
| 40 to 44 | 1217 | 1233 | 2,450 |
| 45 to 49 | 1200 | 1190 | 2,390 |
| 50 to 54 | 1401 | 1402 | 2,803 |
| 55 to 59 | 1226 | 1337 | 2,563 |
| 60 to 64 | 1077 | 1109 | 2,186 |
| 65 to 69 | 902 | 983 | 1,885 |
| 70 to 74 | 711 | 755 | 1,466 |
| 75 to 79 | 485 | 538 | 1,023 |
| 80 to 84 | 285 | 350 | 635 |
| 85+ | 187 | 275 | 462 |
McClain County resident population estimates by Sex, Race, and Hispanic Origin[1b]. For full list of abbrevations see: population.us/about page.
| Race | Male | Female | Total |
| NH | 16989 | 17520 | 34,509 |
| WAC | 16976 | 17198 | 34,174 |
| WA | 16013 | 16224 | 32,237 |
| NHWAC | 15573 | 16008 | 31,581 |
| NHWA | 14677 | 15091 | 29,768 |
| IAC | 2092 | 2156 | 4,248 |
| NHIAC | 1937 | 2028 | 3,965 |
| H | 1515 | 1289 | 2,804 |
| HWAC | 1403 | 1190 | 2,593 |
| IA | 1231 | 1279 | 2,510 |
| HWA | 1336 | 1133 | 2,469 |
| NHIA | 1136 | 1205 | 2,341 |
| TOM | 994 | 1009 | 2,003 |
| NHTOM | 926 | 947 | 1,873 |
| BAC | 300 | 252 | 552 |
| NHBAC | 278 | 226 | 504 |
| BA | 184 | 148 | 332 |
| NHBA | 173 | 131 | 304 |
| HIAC | 155 | 128 | 283 |
| AAC | 121 | 157 | 278 |
| NHAAC | 117 | 154 | 271 |
| AA | 69 | 103 | 172 |
| NHAA | 68 | 103 | 171 |
| HIA | 95 | 74 | 169 |
| HTOM | 68 | 62 | 130 |
| NAC | 21 | 58 | 79 |
| NHNAC | 17 | 54 | 71 |
| NA | 13 | 46 | 59 |
| NHNA | 9 | 43 | 52 |
| HBAC | 22 | 26 | 48 |
| HBA | 11 | 17 | 28 |
| HNAC | 4 | 4 | 8 |
| HAAC | 4 | 3 | 7 |
| HNA | 4 | 3 | 7 |
| HAA | 1 | 0 | 1 |
• Oklahoma County population
37.3 mi,
3°
• Cleveland County
15 mi,
28°
• Canadian County
47.1 mi,
320°
• Pottawatomie County
30.9 mi,
64°
• Grady County
24.7 mi,
270°
• Stephens County
43.6 mi,
211°
• Pontotoc County
47.5 mi,
115°
• Garvin County
22.6 mi,
159°
• Seminole County
48.9 mi,
78°
• Murray County
42.5 mi,
149°
[0] Calculated by population.us from last known population growth rate, not official data.
[1] County population - 2014, archived from the original, retrieved 02/23/2016
[1b] Annual County Resident Population Estimates by Age, Sex, Race, and Hispanic Origin, (used only data for 2014) archived from the original, retrieved 02/23/2016
[2] County population - 2000-2010, archived from the original, retrieved 02/23/2016
[3] Population of States and Counties of the United States: 1790 to 1992, PDF, 15 Mb, census.gov, retrieved 02/23/2016
[4] County area, latitude longitude data, retrieved 02/23/2016
[5] County boundaries, CSV files on boundaries.us, retrived 03/18/2016
*Chickasaw Nation Oklahoma Notes
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