Last official estimated population of Union County was 41,580 (year 2014)[1]. This was 0.013% of total US population and 1.4% of total Arkansas state population. Area of Union County is 1,055.2 mi² (=2733 km²), in this year population density was 39.40 p/mi². If population growth rate would be same as in period 2010-2014 (-0.04%/yr), Union County population in 2025 would be 41,418 [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] +16.27 %/yr
[1840-1850] +13.55 %/yr
[1850-1860] +1.78 %/yr
[1860-1870] -1.49 %/yr
[1870-1880] +2.41 %/yr
[1880-1890] +1.1 %/yr
[1890-1900] +4.15 %/yr
[1900-1910] +3.17 %/yr
[1910-1920] -0.34 %/yr
[1920-1930] +6.51 %/yr
[1930-1940] -1 %/yr
[1940-1950] -0.15 %/yr
[1950-1960] -0.03 %/yr
[1960-1970] -0.86 %/yr
[1970-1980] +0.67 %/yr
[1980-1990] -0.39 %/yr
[1990-2000] -0.23 %/yr
[2000-2005] -1.12 %/yr
[2005-2010] -0.7 %/yr
[2010-2014] -0.04 %/yr
Looking for settlements in Union County? Visit this page: Settlements in Union County, AR
Population of Union County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1279 | 1324 | 2,603 |
| 5 to 9 | 1432 | 1298 | 2,730 |
| 10 to 14 | 1382 | 1276 | 2,658 |
| 15 to 19 | 1270 | 1219 | 2,489 |
| 20 to 24 | 1257 | 1117 | 2,374 |
| 25 to 29 | 1085 | 1178 | 2,263 |
| 30 to 34 | 1175 | 1289 | 2,464 |
| 35 to 39 | 1130 | 1168 | 2,298 |
| 40 to 44 | 1217 | 1338 | 2,555 |
| 45 to 49 | 1236 | 1279 | 2,515 |
| 50 to 54 | 1457 | 1525 | 2,982 |
| 55 to 59 | 1446 | 1479 | 2,925 |
| 60 to 64 | 1271 | 1423 | 2,694 |
| 65 to 69 | 1036 | 1091 | 2,127 |
| 70 to 74 | 702 | 860 | 1,562 |
| 75 to 79 | 531 | 650 | 1,181 |
| 80 to 84 | 345 | 595 | 940 |
| 85+ | 305 | 562 | 867 |
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 | 18771 | 19995 | 38,766 |
| WAC | 13123 | 13390 | 26,513 |
| WA | 12837 | 13087 | 25,924 |
| NHWAC | 12429 | 12813 | 25,242 |
| NHWA | 12189 | 12549 | 24,738 |
| BAC | 6333 | 7061 | 13,394 |
| NHBAC | 6278 | 7009 | 13,287 |
| BA | 6195 | 6928 | 13,123 |
| NHBA | 6159 | 6886 | 13,045 |
| H | 785 | 676 | 1,461 |
| HWAC | 694 | 577 | 1,271 |
| HWA | 648 | 538 | 1,186 |
| TOM | 302 | 321 | 623 |
| NHTOM | 254 | 278 | 532 |
| IAC | 244 | 287 | 531 |
| NHIAC | 188 | 226 | 414 |
| AAC | 146 | 238 | 384 |
| NHAAC | 122 | 213 | 335 |
| AA | 111 | 198 | 309 |
| NHAA | 94 | 178 | 272 |
| IA | 99 | 127 | 226 |
| NHIA | 68 | 96 | 164 |
| HIAC | 56 | 61 | 117 |
| HBAC | 55 | 52 | 107 |
| HTOM | 48 | 43 | 91 |
| HBA | 36 | 42 | 78 |
| HIA | 31 | 31 | 62 |
| HAAC | 24 | 25 | 49 |
| NAC | 23 | 24 | 47 |
| HAA | 17 | 20 | 37 |
| NHNAC | 16 | 18 | 34 |
| NA | 12 | 10 | 22 |
| NHNA | 7 | 8 | 15 |
| HNAC | 7 | 6 | 13 |
| HNA | 5 | 2 | 7 |
• Lincoln Parish population
39.3 mi,
185°
• Webster Parish
52.5 mi,
234°
• Morehouse Parish
52.1 mi,
117°
• Ouachita County
33.4 mi,
331°
• Columbia County
36.9 mi,
275°
• Union Parish
26.7 mi,
151°
• Ashley County
47.8 mi,
88°
• Claiborne Parish
32.7 mi,
223°
• Bradley County
32.2 mi,
50°
• Calhoun County
27.5 mi,
10°
[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
*Clark, Hempstead, Arkansas Arkansas Notes
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