Last official estimated population of Polk County was 31,171 (year 2014)[1]. This was 0.01% of total US population and 0.5% of total Missouri state population. Area of Polk County is 642.4 mi² (=1663.8 km²), in this year population density was 48.52 p/mi². If population growth rate would be same as in period 2010-2014 (+0.03%/yr), Polk County population in 2025 would be 31,265 [0].
Historical population of Polk County for period 1840-2014 [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
[1840-1850] -3.07 %/yr
[1850-1860] +4.91 %/yr
[1860-1870] +2.22 %/yr
[1870-1880] +2.37 %/yr
[1880-1890] +2.6 %/yr
[1890-1900] +1.35 %/yr
[1900-1910] -0.75 %/yr
[1910-1920] -0.58 %/yr
[1920-1930] -1.33 %/yr
[1930-1940] -0.23 %/yr
[1940-1950] -0.8 %/yr
[1950-1960] -1.54 %/yr
[1960-1970] +1.15 %/yr
[1970-1980] +2.02 %/yr
[1980-1990] +1.49 %/yr
[1990-2000] +2.12 %/yr
[2000-2005] +1.71 %/yr
[2005-2010] +1.22 %/yr
[2010-2014] +0.03 %/yr
Looking for settlements in Polk County? Visit this page: Settlements in Polk County, MO
Population of Polk County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 909 | 971 | 1,880 |
| 5 to 9 | 996 | 957 | 1,953 |
| 10 to 14 | 1070 | 1012 | 2,082 |
| 15 to 19 | 1366 | 1306 | 2,672 |
| 20 to 24 | 1300 | 1367 | 2,667 |
| 25 to 29 | 810 | 755 | 1,565 |
| 30 to 34 | 858 | 882 | 1,740 |
| 35 to 39 | 804 | 811 | 1,615 |
| 40 to 44 | 867 | 953 | 1,820 |
| 45 to 49 | 861 | 899 | 1,760 |
| 50 to 54 | 1142 | 1092 | 2,234 |
| 55 to 59 | 943 | 1023 | 1,966 |
| 60 to 64 | 841 | 953 | 1,794 |
| 65 to 69 | 795 | 830 | 1,625 |
| 70 to 74 | 638 | 666 | 1,304 |
| 75 to 79 | 413 | 551 | 964 |
| 80 to 84 | 301 | 443 | 744 |
| 85+ | 250 | 419 | 669 |
Polk 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 | 14845 | 15555 | 30,400 |
| WAC | 14710 | 15480 | 30,190 |
| WA | 14473 | 15240 | 29,713 |
| NHWAC | 14406 | 15167 | 29,573 |
| NHWA | 14186 | 14948 | 29,134 |
| H | 319 | 335 | 654 |
| HWAC | 304 | 313 | 617 |
| HWA | 287 | 292 | 579 |
| IAC | 237 | 264 | 501 |
| TOM | 247 | 250 | 497 |
| NHIAC | 224 | 244 | 468 |
| BAC | 284 | 179 | 463 |
| NHTOM | 228 | 229 | 457 |
| NHBAC | 268 | 170 | 438 |
| AAC | 165 | 210 | 375 |
| NHAAC | 160 | 195 | 355 |
| BA | 210 | 108 | 318 |
| NHBA | 201 | 106 | 307 |
| AA | 120 | 167 | 287 |
| NHAA | 119 | 154 | 273 |
| IA | 107 | 119 | 226 |
| NHIA | 104 | 112 | 216 |
| HTOM | 19 | 21 | 40 |
| NAC | 20 | 17 | 37 |
| NHNAC | 20 | 17 | 37 |
| HIAC | 13 | 20 | 33 |
| HBAC | 16 | 9 | 25 |
| HAAC | 5 | 15 | 20 |
| HAA | 1 | 13 | 14 |
| NA | 7 | 6 | 13 |
| NHNA | 7 | 6 | 13 |
| HBA | 9 | 2 | 11 |
| HIA | 3 | 7 | 10 |
| HNAC | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Greene County population
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42.4 mi, 
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• Laclede County
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• Dallas County
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• Cedar County
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• Hickory County
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[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
*Crawford, Wayne Missouri Notes
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