Last official estimated population of Warren County was 213,485 (year 2014)[1]. This was 0.067% of total US population and 1.8% of total Ohio state population. Area of Warren County is 407.3 mi² (=1054.9 km²), in this year population density was 524.13 p/mi². If population growth rate would be same as in period 2010-2014 (+0.09%/yr), Warren County population in 2025 would be 215,678 [0].
Historical population of Warren County for period 1810-2014 [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
[1810-1820] +6.04 %/yr
[1820-1830] +1.87 %/yr
[1830-1840] +0.75 %/yr
[1840-1850] +1 %/yr
[1850-1860] +0.51 %/yr
[1860-1870] -0.08 %/yr
[1870-1880] +0.62 %/yr
[1880-1890] -1.08 %/yr
[1890-1900] +0.05 %/yr
[1900-1910] -0.43 %/yr
[1910-1920] +0.49 %/yr
[1920-1930] +0.62 %/yr
[1930-1940] +0.89 %/yr
[1940-1950] +2.56 %/yr
[1950-1960] +5.49 %/yr
[1960-1970] +2.6 %/yr
[1970-1980] +1.57 %/yr
[1980-1990] +1.39 %/yr
[1990-2000] +3.42 %/yr
[2000-2005] +4.15 %/yr
[2005-2010] +1.7 %/yr
[2010-2014] +0.09 %/yr
Looking for settlements in Warren County? Visit this page: Settlements in Warren County, OH
Population of Warren County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 6662 | 6416 | 13,078 |
| 5 to 9 | 8146 | 7615 | 15,761 |
| 10 to 14 | 9334 | 8738 | 18,072 |
| 15 to 19 | 8090 | 7513 | 15,603 |
| 20 to 24 | 6506 | 5414 | 11,920 |
| 25 to 29 | 6092 | 5300 | 11,392 |
| 30 to 34 | 6772 | 6665 | 13,437 |
| 35 to 39 | 7260 | 7319 | 14,579 |
| 40 to 44 | 8551 | 8402 | 16,953 |
| 45 to 49 | 8676 | 8613 | 17,289 |
| 50 to 54 | 8864 | 8699 | 17,563 |
| 55 to 59 | 7521 | 7662 | 15,183 |
| 60 to 64 | 5793 | 6155 | 11,948 |
| 65 to 69 | 4797 | 5163 | 9,960 |
| 70 to 74 | 3282 | 3749 | 7,031 |
| 75 to 79 | 2266 | 2813 | 5,079 |
| 80 to 84 | 1406 | 1950 | 3,356 |
| 85+ | 1197 | 2258 | 3,455 |
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 | 108360 | 107631 | 215,991 |
| WAC | 100862 | 101968 | 202,830 |
| WA | 99245 | 100412 | 199,657 |
| NHWAC | 98231 | 99356 | 197,587 |
| NHWA | 96700 | 97917 | 194,617 |
| AAC | 5702 | 6076 | 11,778 |
| NHAAC | 5648 | 6024 | 11,672 |
| AA | 5019 | 5438 | 10,457 |
| NHAA | 4991 | 5410 | 10,401 |
| BAC | 5688 | 3403 | 9,091 |
| NHBAC | 5526 | 3224 | 8,750 |
| BA | 5003 | 2740 | 7,743 |
| NHBA | 4883 | 2621 | 7,504 |
| H | 2855 | 2813 | 5,668 |
| HWAC | 2631 | 2612 | 5,243 |
| HWA | 2545 | 2495 | 5,040 |
| TOM | 1685 | 1627 | 3,312 |
| NHTOM | 1587 | 1501 | 3,088 |
| IAC | 639 | 649 | 1,288 |
| NHIAC | 545 | 548 | 1,093 |
| IA | 211 | 195 | 406 |
| HBAC | 162 | 179 | 341 |
| NHIA | 156 | 153 | 309 |
| HBA | 120 | 119 | 239 |
| HTOM | 98 | 126 | 224 |
| HIAC | 94 | 101 | 195 |
| NAC | 105 | 72 | 177 |
| NHNAC | 89 | 65 | 154 |
| HAAC | 54 | 52 | 106 |
| HIA | 55 | 42 | 97 |
| NA | 52 | 32 | 84 |
| NHNA | 43 | 29 | 72 |
| HAA | 28 | 28 | 56 |
| HNAC | 16 | 7 | 23 |
| HNA | 9 | 3 | 12 |
• Hamilton County population
25.5 mi, 
231°
• Montgomery County
23.6 mi, 
344°
• Butler County
21.1 mi, 
272°
• Clermont County
25.8 mi, 
177°
• Greene County
23.3 mi, 
39°
• Campbell County
34.9 mi, 
198°
• Brown County
37.8 mi, 
154°
• Highland County
34.7 mi, 
118°
• Preble County
33.3 mi, 
310°
• Clinton County
20 mi, 
89°
[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
*Hamilton Ohio Notes
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