Last official estimated population of Osage County was 13,875 (year 2014)[1]. This was 0.004% of total US population and 0.2% of total Missouri state population. Area of Osage County is 613.4 mi² (=1588.8 km²), in this year population density was 22.62 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Osage County population in 2021 would be 13,870 [0].
Historical population of Osage County for period 1850-2014 [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
[1850-1860] +1.63 %/yr
[1860-1870] +3.2 %/yr
[1870-1880] +0.92 %/yr
[1880-1890] +1.01 %/yr
[1890-1900] +0.75 %/yr
[1900-1910] +0.13 %/yr
[1910-1920] -0.52 %/yr
[1920-1930] -0.84 %/yr
[1930-1940] -0.07 %/yr
[1940-1950] -0.9 %/yr
[1950-1960] -0.39 %/yr
[1960-1970] +0.12 %/yr
[1970-1980] +0.89 %/yr
[1980-1990] +0 %/yr
[1990-2000] +0.8 %/yr
[2000-2005] +0.74 %/yr
[2005-2010] +0.54 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Osage County? Visit this page: Settlements in Osage County, MO
Population of Osage County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 399 | 383 | 782 |
| 5 to 9 | 483 | 441 | 924 |
| 10 to 14 | 483 | 463 | 946 |
| 15 to 19 | 544 | 425 | 969 |
| 20 to 24 | 501 | 341 | 842 |
| 25 to 29 | 390 | 347 | 737 |
| 30 to 34 | 383 | 359 | 742 |
| 35 to 39 | 439 | 374 | 813 |
| 40 to 44 | 451 | 415 | 866 |
| 45 to 49 | 471 | 461 | 932 |
| 50 to 54 | 589 | 516 | 1,105 |
| 55 to 59 | 492 | 460 | 952 |
| 60 to 64 | 410 | 394 | 804 |
| 65 to 69 | 362 | 332 | 694 |
| 70 to 74 | 267 | 267 | 534 |
| 75 to 79 | 189 | 228 | 417 |
| 80 to 84 | 153 | 187 | 340 |
| 85+ | 110 | 194 | 304 |
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 |
| NH | 7074 | 6534 | 13,608 |
| WAC | 7053 | 6537 | 13,590 |
| NHWAC | 7017 | 6489 | 13,506 |
| WA | 7015 | 6482 | 13,497 |
| NHWA | 6980 | 6435 | 13,415 |
| H | 42 | 53 | 95 |
| TOM | 39 | 56 | 95 |
| NHTOM | 38 | 54 | 92 |
| BAC | 43 | 46 | 89 |
| NHBAC | 42 | 45 | 87 |
| HWAC | 36 | 48 | 84 |
| HWA | 35 | 47 | 82 |
| IAC | 33 | 42 | 75 |
| NHIAC | 29 | 40 | 69 |
| BA | 23 | 22 | 45 |
| NHBA | 22 | 21 | 43 |
| AAC | 20 | 15 | 35 |
| IA | 19 | 16 | 35 |
| NHAAC | 20 | 13 | 33 |
| NHIA | 16 | 15 | 31 |
| AA | 14 | 9 | 23 |
| NHAA | 14 | 8 | 22 |
| NAC | 6 | 4 | 10 |
| NA | 6 | 2 | 8 |
| NHNAC | 4 | 2 | 6 |
| HIAC | 4 | 2 | 6 |
| NHNA | 4 | 1 | 5 |
| HIA | 3 | 1 | 4 |
| HNAC | 2 | 2 | 4 |
| HNA | 2 | 1 | 3 |
| HTOM | 1 | 2 | 3 |
| HBA | 1 | 1 | 2 |
| HBAC | 1 | 1 | 2 |
| HAAC | 0 | 2 | 2 |
| HAA | 0 | 1 | 1 |
• Franklin County population
42.7 mi, 
95°
• Cole County
22.9 mi, 
276°
• Phelps County
41.5 mi, 
174°
• Callaway County
25.9 mi, 
352°
• Warren County
43 mi, 
61°
• Miller County
35.3 mi, 
241°
• Moniteau County
40.8 mi, 
286°
• Gasconade County
19.2 mi, 
94°
• Montgomery County
38.9 mi, 
33°
• Maries County
21.1 mi, 
189°
[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
*Gasconade Missouri Notes
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