Last official estimated population of Union County was 28,909 (year 2014)[1]. This was 0.009% of total US population and 0.6% of total South Carolina state population. Area of Union County is 516.0 mi² (=1336.5 km²), in this year population density was 56.02 p/mi². If population growth rate would be same as in period 2010-2014 (-0.04%/yr), Union County population in 2024 would be 28,779 [0].
Historical population of Union County for period 1790-2014 [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
[1790-1800] +2.9 %/yr
[1800-1810] +0.72 %/yr
[1810-1820] +2.54 %/yr
[1820-1830] +2.4 %/yr
[1830-1840] +0.56 %/yr
[1840-1850] +0.47 %/yr
[1850-1860] -0.11 %/yr
[1860-1870] -0.2 %/yr
[1870-1880] +2.27 %/yr
[1880-1890] +0.52 %/yr
[1890-1900] +0.05 %/yr
[1900-1910] +1.61 %/yr
[1910-1920] +0.15 %/yr
[1920-1930] +0.18 %/yr
[1930-1940] +0.14 %/yr
[1940-1950] -0.01 %/yr
[1950-1960] -0.43 %/yr
[1960-1970] -0.26 %/yr
[1970-1980] +0.51 %/yr
[1980-1990] -0.14 %/yr
[1990-2000] -0.13 %/yr
[2000-2005] -0.47 %/yr
[2005-2010] -0.19 %/yr
[2010-2014] -0.04 %/yr
Looking for settlements in Union County? Visit this page: Settlements in Union County, SC
Population of Union County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 745 | 755 | 1,500 |
| 5 to 9 | 858 | 823 | 1,681 |
| 10 to 14 | 878 | 863 | 1,741 |
| 15 to 19 | 939 | 802 | 1,741 |
| 20 to 24 | 809 | 837 | 1,646 |
| 25 to 29 | 692 | 791 | 1,483 |
| 30 to 34 | 646 | 783 | 1,429 |
| 35 to 39 | 771 | 812 | 1,583 |
| 40 to 44 | 882 | 918 | 1,800 |
| 45 to 49 | 894 | 950 | 1,844 |
| 50 to 54 | 1006 | 1135 | 2,141 |
| 55 to 59 | 1066 | 1138 | 2,204 |
| 60 to 64 | 926 | 997 | 1,923 |
| 65 to 69 | 776 | 955 | 1,731 |
| 70 to 74 | 565 | 700 | 1,265 |
| 75 to 79 | 390 | 530 | 920 |
| 80 to 84 | 243 | 417 | 660 |
| 85+ | 160 | 424 | 584 |
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 | 13073 | 14479 | 27,552 |
| WAC | 8999 | 9832 | 18,831 |
| NHWAC | 8874 | 9721 | 18,595 |
| WA | 8816 | 9640 | 18,456 |
| NHWA | 8697 | 9535 | 18,232 |
| BAC | 4287 | 4860 | 9,147 |
| NHBAC | 4240 | 4823 | 9,063 |
| BA | 4134 | 4702 | 8,836 |
| NHBA | 4094 | 4668 | 8,762 |
| TOM | 196 | 213 | 409 |
| NHTOM | 189 | 205 | 394 |
| H | 173 | 151 | 324 |
| HWAC | 125 | 111 | 236 |
| HWA | 119 | 105 | 224 |
| IAC | 90 | 80 | 170 |
| NHIAC | 84 | 72 | 156 |
| AAC | 56 | 62 | 118 |
| NHAAC | 56 | 60 | 116 |
| HBAC | 47 | 37 | 84 |
| AA | 42 | 39 | 81 |
| NHAA | 42 | 39 | 81 |
| IA | 51 | 29 | 80 |
| HBA | 40 | 34 | 74 |
| NHIA | 46 | 25 | 71 |
| NAC | 13 | 12 | 25 |
| NHNAC | 11 | 11 | 22 |
| HTOM | 7 | 8 | 15 |
| NA | 7 | 7 | 14 |
| HIAC | 6 | 8 | 14 |
| NHNA | 5 | 7 | 12 |
| HIA | 5 | 4 | 9 |
| HNAC | 2 | 1 | 3 |
| HNA | 2 | 0 | 2 |
| HAAC | 0 | 2 | 2 |
| HAA | 0 | 0 | 0 |
• Greenville County population
45.1 mi, 
288°
• Spartanburg County
27.1 mi, 
308°
• York County
31.2 mi, 
51°
• Cleveland County
44.6 mi, 
4°
• Greenwood County
47.1 mi, 
218°
• Laurens County
26.4 mi, 
237°
• Cherokee County
24.8 mi, 1°
• Newberry County
27.7 mi, 
178°
• Chester County
25.8 mi, 
90°
• Fairfield County
34.5 mi, 
126°
[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
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