Last official estimated population of Osage County was 16,294 (year 2014)[1]. This was 0.005% of total US population and 0.6% of total Kansas state population. Area of Osage County is 719.8 mi² (=1864.4 km²), in this year population density was 22.64 p/mi². If population growth rate would be same as in period 2010-2014 (-0%/yr), Osage County population in 2025 would be 16,291 [0].
Historical population of Osage County for period 1860-2014 [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

[1860-1870] +21.26 %/yr
[1870-1880] +9.89 %/yr
[1880-1890] +2.47 %/yr
[1890-1900] -0.57 %/yr
[1900-1910] -1.71 %/yr
[1910-1920] -0.66 %/yr
[1920-1930] -0.6 %/yr
[1930-1940] -1.47 %/yr
[1940-1950] -1.64 %/yr
[1950-1960] +0.06 %/yr
[1960-1970] +0.36 %/yr
[1970-1980] +1.38 %/yr
[1980-1990] -0.05 %/yr
[1990-2000] +0.92 %/yr
[2000-2005] +0.19 %/yr
[2005-2010] -0.69 %/yr
[2010-2014] -0 %/yr
Looking for settlements in Osage County? Visit this page: Settlements in Osage County, KS
Population of Osage County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 440 | 458 | 898 |
| 5 to 9 | 581 | 481 | 1,062 |
| 10 to 14 | 563 | 534 | 1,097 |
| 15 to 19 | 598 | 515 | 1,113 |
| 20 to 24 | 427 | 390 | 817 |
| 25 to 29 | 363 | 372 | 735 |
| 30 to 34 | 440 | 402 | 842 |
| 35 to 39 | 398 | 427 | 825 |
| 40 to 44 | 451 | 517 | 968 |
| 45 to 49 | 470 | 445 | 915 |
| 50 to 54 | 644 | 684 | 1,328 |
| 55 to 59 | 647 | 635 | 1,282 |
| 60 to 64 | 558 | 552 | 1,110 |
| 65 to 69 | 492 | 451 | 943 |
| 70 to 74 | 346 | 381 | 727 |
| 75 to 79 | 235 | 274 | 509 |
| 80 to 84 | 188 | 182 | 370 |
| 85+ | 130 | 265 | 395 |
Osage 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 |
| WAC | 7832 | 7824 | 15,656 |
| NH | 7766 | 7738 | 15,504 |
| WA | 7704 | 7666 | 15,370 |
| NHWAC | 7640 | 7610 | 15,250 |
| NHWA | 7526 | 7466 | 14,992 |
| H | 205 | 227 | 432 |
| HWAC | 192 | 214 | 406 |
| HWA | 178 | 200 | 378 |
| TOM | 133 | 166 | 299 |
| IAC | 130 | 152 | 282 |
| NHTOM | 118 | 152 | 270 |
| NHIAC | 115 | 138 | 253 |
| BAC | 113 | 94 | 207 |
| NHBAC | 104 | 84 | 188 |
| IA | 64 | 68 | 132 |
| NHIA | 58 | 60 | 118 |
| AAC | 32 | 58 | 90 |
| BA | 54 | 29 | 83 |
| NHAAC | 27 | 56 | 83 |
| NHBA | 51 | 26 | 77 |
| AA | 12 | 34 | 46 |
| NHAA | 11 | 32 | 43 |
| HTOM | 15 | 14 | 29 |
| HIAC | 15 | 14 | 29 |
| HBAC | 9 | 10 | 19 |
| HIA | 6 | 8 | 14 |
| NAC | 6 | 7 | 13 |
| NHNAC | 4 | 6 | 10 |
| HAAC | 5 | 2 | 7 |
| NA | 4 | 2 | 6 |
| HBA | 3 | 3 | 6 |
| NHNA | 2 | 2 | 4 |
| HNAC | 2 | 1 | 3 |
| HAA | 1 | 2 | 3 |
| HNA | 2 | 0 | 2 |
• Johnson County population
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354°
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28.2 mi,
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27.9 mi,
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47.6 mi,
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• Franklin County
24 mi,
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• Jefferson County
44.6 mi,
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• Coffey County
28.5 mi,
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• Anderson County
37.4 mi,
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• Wabaunsee County
34 mi,
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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
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