Last official estimated population of Union County was 12,506 (year 2014)[1]. This was 0.004% of total US population and 0.4% of total Iowa state population. Area of Union County is 425.8 mi² (=1102.8 km²), in this year population density was 29.37 p/mi². If population growth rate would be same as in period 2010-2014 (-0.06%/yr), Union County population in 2026 would be 12,422 [0].
Historical population of Union County for period 1860-2014 [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
[1860-1870] +11.52 %/yr
[1870-1880] +9.61 %/yr
[1880-1890] +1.21 %/yr
[1890-1900] +1.66 %/yr
[1900-1910] -1.8 %/yr
[1910-1920] +0.39 %/yr
[1920-1930] +0.1 %/yr
[1930-1940] -0.68 %/yr
[1940-1950] -0.39 %/yr
[1950-1960] -1.31 %/yr
[1960-1970] -0.11 %/yr
[1970-1980] +0.22 %/yr
[1980-1990] -0.83 %/yr
[1990-2000] -0.35 %/yr
[2000-2005] -0.28 %/yr
[2005-2010] +0.64 %/yr
[2010-2014] -0.06 %/yr
Looking for settlements in Union County? Visit this page: Settlements in Union County, IA
Population of Union County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 365 | 398 | 763 |
| 5 to 9 | 460 | 390 | 850 |
| 10 to 14 | 399 | 387 | 786 |
| 15 to 19 | 411 | 426 | 837 |
| 20 to 24 | 396 | 376 | 772 |
| 25 to 29 | 325 | 322 | 647 |
| 30 to 34 | 372 | 400 | 772 |
| 35 to 39 | 344 | 343 | 687 |
| 40 to 44 | 343 | 366 | 709 |
| 45 to 49 | 349 | 346 | 695 |
| 50 to 54 | 452 | 453 | 905 |
| 55 to 59 | 430 | 464 | 894 |
| 60 to 64 | 401 | 428 | 829 |
| 65 to 69 | 341 | 357 | 698 |
| 70 to 74 | 247 | 295 | 542 |
| 75 to 79 | 212 | 211 | 423 |
| 80 to 84 | 122 | 217 | 339 |
| 85+ | 127 | 241 | 368 |
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 | 5973 | 6299 | 12,272 |
| NH | 5909 | 6262 | 12,171 |
| WA | 5906 | 6242 | 12,148 |
| NHWAC | 5800 | 6154 | 11,954 |
| NHWA | 5741 | 6105 | 11,846 |
| H | 187 | 158 | 345 |
| HWAC | 173 | 145 | 318 |
| HWA | 165 | 137 | 302 |
| BAC | 97 | 79 | 176 |
| NHBAC | 87 | 69 | 156 |
| TOM | 69 | 57 | 126 |
| BA | 66 | 55 | 121 |
| NHTOM | 61 | 49 | 110 |
| NHBA | 60 | 48 | 108 |
| AAC | 43 | 60 | 103 |
| NHAAC | 41 | 56 | 97 |
| IAC | 55 | 40 | 95 |
| AA | 29 | 47 | 76 |
| NHIAC | 42 | 33 | 75 |
| NHAA | 29 | 44 | 73 |
| IA | 25 | 16 | 41 |
| NHIA | 17 | 13 | 30 |
| HIAC | 13 | 7 | 20 |
| HBAC | 10 | 10 | 20 |
| HTOM | 8 | 8 | 16 |
| HBA | 6 | 7 | 13 |
| HIA | 8 | 3 | 11 |
| NAC | 2 | 7 | 9 |
| NHNAC | 2 | 6 | 8 |
| HAAC | 2 | 4 | 6 |
| NA | 1 | 3 | 4 |
| NHNA | 1 | 3 | 4 |
| HAA | 0 | 3 | 3 |
| HNAC | 0 | 1 | 1 |
| HNA | 0 | 0 | 0 |
• Warren County population
41.3 mi, 
58°
• Madison County
24.1 mi, 
29°
• Cass County
41.5 mi, 
300°
• Clarke County
24 mi, 
89°
• Decatur County
31.4 mi, 
130°
• Adair County
24 mi, 
329°
• Taylor County
31 mi, 
229°
• Ringgold County
20.3 mi, 
179°
• Adams County
23.6 mi, 
268°
• Worth County
39 mi, 
193°
[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
*Pottawattamie Iowa Notes
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