Last official estimated population of Union County was 19,120 (year 2014)[1]. This was 0.006% of total US population and 0.3% of total Tennessee state population. Area of Union County is 247.1 mi² (=640.1 km²), in this year population density was 77.37 p/mi². If population growth rate would be same as in period 2010-2014 (+0.01%/yr), Union County population in 2026 would be 19,153 [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] +2.2 %/yr
[1870-1880] +3.04 %/yr
[1880-1890] +1.11 %/yr
[1890-1900] +1.19 %/yr
[1900-1910] -1.21 %/yr
[1910-1920] +0.17 %/yr
[1920-1930] -0.21 %/yr
[1930-1940] -2.28 %/yr
[1940-1950] -0.41 %/yr
[1950-1960] -0.2 %/yr
[1960-1970] +0.66 %/yr
[1970-1980] +2.58 %/yr
[1980-1990] +1.58 %/yr
[1990-2000] +2.68 %/yr
[2000-2005] +0.98 %/yr
[2005-2010] +0.4 %/yr
[2010-2014] +0.01 %/yr
Looking for settlements in Union County? Visit this page: Settlements in Union County, TN
Population of Union County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 639 | 595 | 1,234 |
| 5 to 9 | 598 | 619 | 1,217 |
| 10 to 14 | 682 | 607 | 1,289 |
| 15 to 19 | 594 | 527 | 1,121 |
| 20 to 24 | 555 | 517 | 1,072 |
| 25 to 29 | 499 | 588 | 1,087 |
| 30 to 34 | 548 | 529 | 1,077 |
| 35 to 39 | 593 | 564 | 1,157 |
| 40 to 44 | 594 | 591 | 1,185 |
| 45 to 49 | 635 | 686 | 1,321 |
| 50 to 54 | 733 | 764 | 1,497 |
| 55 to 59 | 707 | 747 | 1,454 |
| 60 to 64 | 628 | 652 | 1,280 |
| 65 to 69 | 598 | 546 | 1,144 |
| 70 to 74 | 440 | 433 | 873 |
| 75 to 79 | 242 | 300 | 542 |
| 80 to 84 | 103 | 199 | 302 |
| 85+ | 89 | 172 | 261 |
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 | 9377 | 9529 | 18,906 |
| NH | 9316 | 9514 | 18,830 |
| WA | 9278 | 9401 | 18,679 |
| NHWAC | 9240 | 9432 | 18,672 |
| NHWA | 9145 | 9307 | 18,452 |
| H | 161 | 122 | 283 |
| IAC | 108 | 135 | 243 |
| TOM | 105 | 134 | 239 |
| HWAC | 137 | 97 | 234 |
| NHTOM | 101 | 131 | 232 |
| HWA | 133 | 94 | 227 |
| NHIAC | 91 | 113 | 204 |
| BAC | 60 | 69 | 129 |
| NHBAC | 58 | 66 | 124 |
| IA | 39 | 46 | 85 |
| BA | 28 | 35 | 63 |
| AAC | 30 | 32 | 62 |
| NHBA | 28 | 34 | 62 |
| NHAAC | 28 | 31 | 59 |
| NHIA | 24 | 26 | 50 |
| HIAC | 17 | 22 | 39 |
| HIA | 15 | 20 | 35 |
| AA | 18 | 14 | 32 |
| NHAA | 16 | 13 | 29 |
| NAC | 11 | 10 | 21 |
| NA | 9 | 6 | 15 |
| NHNAC | 4 | 7 | 11 |
| HNAC | 7 | 3 | 10 |
| HNA | 7 | 3 | 10 |
| HTOM | 4 | 3 | 7 |
| HBAC | 2 | 3 | 5 |
| NHNA | 2 | 3 | 5 |
| HAAC | 2 | 1 | 3 |
| HAA | 2 | 1 | 3 |
| HBA | 0 | 1 | 1 |
• Knox County population
20.9 mi, 
195°
• Anderson County
23.1 mi, 
240°
• Hamblen County
32.1 mi, 
98°
• Jefferson County
27.4 mi, 
126°
• Campbell County
19.7 mi, 
294°
• Whitley County
37 mi, 
332°
• Claiborne County
17.9 mi, 
32°
• Bell County
31.5 mi, 
15°
• Grainger County
18.2 mi, 
91°
• Hancock County
37.6 mi, 
64°
[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 42 Tennessee Notes
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