Last official estimated population of Union County was 7,538 (year 2014)[1]. This was 0.002% of total US population and 0.1% of total Indiana state population. Area of Union County is 165.2 mi² (=427.8 km²), in this year population density was 45.64 p/mi². If population growth rate would be same as in period 2010-2014 (+0.07%/yr), Union County population in 2026 would be 7,604 [0].
Historical population of Union County for period 1830-2014 [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
[1830-1840] +0.09 %/yr
[1840-1850] -1.43 %/yr
[1850-1860] +0.24 %/yr
[1860-1870] -1.14 %/yr
[1870-1880] +1.93 %/yr
[1880-1890] -0.91 %/yr
[1890-1900] -0.37 %/yr
[1900-1910] -0.75 %/yr
[1910-1920] -0.39 %/yr
[1920-1930] -0.24 %/yr
[1930-1940] +0.23 %/yr
[1940-1950] +0.64 %/yr
[1950-1960] +0.07 %/yr
[1960-1970] +0.19 %/yr
[1970-1980] +0.41 %/yr
[1980-1990] +0.17 %/yr
[1990-2000] +0.51 %/yr
[2000-2005] +0.1 %/yr
[2005-2010] +0.37 %/yr
[2010-2014] +0.07 %/yr
Looking for settlements in Union County? Visit this page: Settlements in Union County, IN
Population of Union County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 177 | 152 | 329 |
| 5 to 9 | 221 | 203 | 424 |
| 10 to 14 | 276 | 253 | 529 |
| 15 to 19 | 282 | 246 | 528 |
| 20 to 24 | 242 | 206 | 448 |
| 25 to 29 | 153 | 191 | 344 |
| 30 to 34 | 184 | 196 | 380 |
| 35 to 39 | 202 | 210 | 412 |
| 40 to 44 | 221 | 246 | 467 |
| 45 to 49 | 269 | 268 | 537 |
| 50 to 54 | 296 | 299 | 595 |
| 55 to 59 | 274 | 262 | 536 |
| 60 to 64 | 233 | 260 | 493 |
| 65 to 69 | 209 | 230 | 439 |
| 70 to 74 | 144 | 160 | 304 |
| 75 to 79 | 82 | 116 | 198 |
| 80 to 84 | 54 | 79 | 133 |
| 85+ | 52 | 98 | 150 |
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 |
| WAC | 3529 | 3614 | 7,143 |
| NH | 3520 | 3621 | 7,141 |
| WA | 3483 | 3564 | 7,047 |
| NHWAC | 3483 | 3562 | 7,045 |
| NHWA | 3438 | 3512 | 6,950 |
| H | 51 | 54 | 105 |
| TOM | 47 | 52 | 99 |
| NHTOM | 46 | 52 | 98 |
| HWAC | 46 | 52 | 98 |
| HWA | 45 | 52 | 97 |
| BAC | 36 | 53 | 89 |
| NHBAC | 34 | 53 | 87 |
| IAC | 33 | 34 | 67 |
| NHIAC | 28 | 32 | 60 |
| BA | 22 | 30 | 52 |
| NHBA | 21 | 30 | 51 |
| AAC | 20 | 28 | 48 |
| NHAAC | 20 | 28 | 48 |
| IA | 12 | 11 | 23 |
| AA | 6 | 16 | 22 |
| NHAA | 6 | 16 | 22 |
| NHIA | 8 | 9 | 17 |
| HIAC | 5 | 2 | 7 |
| HIA | 4 | 2 | 6 |
| NAC | 3 | 2 | 5 |
| NHNAC | 3 | 2 | 5 |
| NA | 1 | 2 | 3 |
| NHNA | 1 | 2 | 3 |
| HBAC | 2 | 0 | 2 |
| HBA | 1 | 0 | 1 |
| HTOM | 1 | 0 | 1 |
| HNAC | 0 | 0 | 0 |
| HAAC | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Hamilton County population
35.8 mi, 
145°
• Montgomery County
34.9 mi, 
75°
• Butler County
23 mi, 
123°
• Wayne County
17.1 mi, 
345°
• Dearborn County
32.9 mi, 
184°
• Henry County
32.8 mi, 
310°
• Preble County
16.9 mi, 
61°
• Fayette County
13.9 mi, 
274°
• Franklin County
16.6 mi, 
207°
• Rush County
28.8 mi, 269°
[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 5 Indiana Notes
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