Last official estimated population of Union County was 52,391 (year 2014)[1]. This was 0.016% of total US population and 0.5% of total Ohio state population. Area of Union County is 436.9 mi² (=1131.5 km²), in this year population density was 119.92 p/mi². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), Union County population in 2025 would be 52,642 [0].
Historical population of Union County for period 1820-2014 [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
[1820-1830] +4.81 %/yr
[1830-1840] +10.19 %/yr
[1840-1850] +3.78 %/yr
[1850-1860] +3.07 %/yr
[1860-1870] +1.27 %/yr
[1870-1880] +1.79 %/yr
[1880-1890] +0.21 %/yr
[1890-1900] -0.23 %/yr
[1900-1910] -0.21 %/yr
[1910-1920] -0.44 %/yr
[1920-1930] -0.86 %/yr
[1930-1940] +0.42 %/yr
[1940-1950] +0.33 %/yr
[1950-1960] +1 %/yr
[1960-1970] +0.4 %/yr
[1970-1980] +2.19 %/yr
[1980-1990] +0.79 %/yr
[1990-2000] +2.51 %/yr
[2000-2005] +2.76 %/yr
[2005-2010] +2.18 %/yr
[2010-2014] +0.04 %/yr
Looking for settlements in Union County? Visit this page: Settlements in Union County, OH
Population of Union County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1595 | 1518 | 3,113 |
| 5 to 9 | 1927 | 2023 | 3,950 |
| 10 to 14 | 2175 | 1934 | 4,109 |
| 15 to 19 | 1916 | 1831 | 3,747 |
| 20 to 24 | 1387 | 1755 | 3,142 |
| 25 to 29 | 1272 | 1843 | 3,115 |
| 30 to 34 | 1586 | 2017 | 3,603 |
| 35 to 39 | 1789 | 2247 | 4,036 |
| 40 to 44 | 2036 | 2338 | 4,374 |
| 45 to 49 | 2018 | 2133 | 4,151 |
| 50 to 54 | 2025 | 2122 | 4,147 |
| 55 to 59 | 1734 | 1801 | 3,535 |
| 60 to 64 | 1364 | 1338 | 2,702 |
| 65 to 69 | 1015 | 1151 | 2,166 |
| 70 to 74 | 682 | 816 | 1,498 |
| 75 to 79 | 458 | 510 | 968 |
| 80 to 84 | 283 | 427 | 710 |
| 85+ | 296 | 414 | 710 |
Union 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 | 25144 | 27812 | 52,956 |
| WAC | 24269 | 26143 | 50,412 |
| WA | 23910 | 25785 | 49,695 |
| NHWAC | 23903 | 25782 | 49,685 |
| NHWA | 23570 | 25442 | 49,012 |
| AAC | 965 | 977 | 1,942 |
| NHAAC | 955 | 967 | 1,922 |
| BAC | 509 | 1294 | 1,803 |
| NHBAC | 470 | 1259 | 1,729 |
| AA | 848 | 868 | 1,716 |
| NHAA | 844 | 860 | 1,704 |
| BA | 334 | 1124 | 1,458 |
| NHBA | 309 | 1099 | 1,408 |
| H | 414 | 406 | 820 |
| TOM | 382 | 376 | 758 |
| HWAC | 366 | 361 | 727 |
| NHTOM | 355 | 356 | 711 |
| HWA | 340 | 343 | 683 |
| IAC | 197 | 183 | 380 |
| NHIAC | 170 | 162 | 332 |
| IA | 75 | 54 | 129 |
| NHIA | 59 | 45 | 104 |
| HBAC | 39 | 35 | 74 |
| HBA | 25 | 25 | 50 |
| HIAC | 27 | 21 | 48 |
| HTOM | 27 | 20 | 47 |
| NAC | 19 | 20 | 39 |
| NHNAC | 17 | 19 | 36 |
| HIA | 16 | 9 | 25 |
| HAAC | 10 | 10 | 20 |
| NA | 9 | 11 | 20 |
| NHNA | 7 | 10 | 17 |
| HAA | 4 | 8 | 12 |
| HNAC | 2 | 1 | 3 |
| HNA | 2 | 1 | 3 |
• Franklin County population
29.5 mi, 
139°
• Delaware County
19 mi, 
93°
• Clark County
34.2 mi, 
220°
• Marion County
22.7 mi, 
27°
• Logan County
22 mi, 
286°
• Madison County
27.6 mi, 
183°
• Champaign County
23.9 mi, 
241°
• Morrow County
33.9 mi, 
62°
• Hardin County
29.6 mi, 
328°
• Wyandot County
37.7 mi, 
4°
[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
See note 20 Ohio Notes
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