Last official estimated population of Warren County was 32,574 (year 2014)[1]. This was 0.01% of total US population and 0.5% of total Missouri state population. Area of Warren County is 437.8 mi² (=1133.8 km²), in this year population density was 74.41 p/mi². If population growth rate would be same as in period 2010-2014 (+0.05%/yr), Warren County population in 2025 would be 32,742 [0].
Historical population of Warren 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] +3.26 %/yr
[1850-1860] +4.2 %/yr
[1860-1870] +0.91 %/yr
[1870-1880] +1.11 %/yr
[1880-1890] -0.86 %/yr
[1890-1900] +0.01 %/yr
[1900-1910] -0.83 %/yr
[1910-1920] -0.72 %/yr
[1920-1930] -0.49 %/yr
[1930-1940] -0.44 %/yr
[1940-1950] -0.09 %/yr
[1950-1960] +1.33 %/yr
[1960-1970] +1.04 %/yr
[1970-1980] +4.39 %/yr
[1980-1990] +2.74 %/yr
[1990-2000] +2.31 %/yr
[2000-2005] +3.47 %/yr
[2005-2010] +2.25 %/yr
[2010-2014] +0.05 %/yr
Looking for settlements in Warren County? Visit this page: Settlements in Warren County, MO
Population of Warren County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1045 | 1006 | 2,051 |
| 5 to 9 | 1220 | 1176 | 2,396 |
| 10 to 14 | 1198 | 1148 | 2,346 |
| 15 to 19 | 1065 | 931 | 1,996 |
| 20 to 24 | 902 | 893 | 1,795 |
| 25 to 29 | 969 | 966 | 1,935 |
| 30 to 34 | 998 | 1037 | 2,035 |
| 35 to 39 | 930 | 956 | 1,886 |
| 40 to 44 | 978 | 917 | 1,895 |
| 45 to 49 | 1047 | 1121 | 2,168 |
| 50 to 54 | 1370 | 1350 | 2,720 |
| 55 to 59 | 1281 | 1218 | 2,499 |
| 60 to 64 | 989 | 1027 | 2,016 |
| 65 to 69 | 839 | 902 | 1,741 |
| 70 to 74 | 741 | 780 | 1,521 |
| 75 to 79 | 502 | 523 | 1,025 |
| 80 to 84 | 323 | 374 | 697 |
| 85+ | 196 | 335 | 531 |
Warren 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 | 16012 | 16178 | 32,190 |
| WAC | 15986 | 16039 | 32,025 |
| WA | 15683 | 15778 | 31,461 |
| NHWAC | 15471 | 15616 | 31,087 |
| NHWA | 15191 | 15376 | 30,567 |
| BAC | 595 | 513 | 1,108 |
| H | 581 | 482 | 1,063 |
| NHBAC | 558 | 493 | 1,051 |
| HWAC | 515 | 423 | 938 |
| HWA | 492 | 402 | 894 |
| BA | 425 | 371 | 796 |
| NHBA | 402 | 363 | 765 |
| TOM | 313 | 272 | 585 |
| NHTOM | 290 | 249 | 539 |
| IAC | 198 | 187 | 385 |
| NHIAC | 158 | 149 | 307 |
| AAC | 115 | 186 | 301 |
| NHAAC | 101 | 162 | 263 |
| AA | 71 | 141 | 212 |
| IA | 91 | 90 | 181 |
| NHAA | 60 | 119 | 179 |
| NHIA | 59 | 64 | 123 |
| HIAC | 40 | 38 | 78 |
| HIA | 32 | 26 | 58 |
| HBAC | 37 | 20 | 57 |
| HTOM | 23 | 23 | 46 |
| HAAC | 14 | 24 | 38 |
| NAC | 20 | 14 | 34 |
| HAA | 11 | 22 | 33 |
| HBA | 23 | 8 | 31 |
| NHNAC | 20 | 11 | 31 |
| NA | 10 | 8 | 18 |
| NHNA | 10 | 7 | 17 |
| HNAC | 0 | 3 | 3 |
| HNA | 0 | 1 | 1 |
• St. Louis County population
39.4 mi, 
102°
• St. Charles County
26.1 mi, 
87°
• Franklin County
24.9 mi, 
169°
• Lincoln County
23.3 mi, 
26°
• Callaway County
41.5 mi, 
277°
• Pike County
39.9 mi, 
359°
• Gasconade County
29 mi, 
220°
• Osage County
43 mi, 
241°
• Montgomery County
20.4 mi, 
306°
• Calhoun County
38.4 mi, 
43°
[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
*Montgomery Missouri Notes
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