Last official estimated population of Union County was 4,541 (year 2014)[1]. This was 0.001% of total US population and 0.2% of total New Mexico state population. Area of Union County is 3,830.9 mi² (=9921.9 km²), in this year population density was 1.19 p/mi². If population growth rate would be same as in period 2010-2014 (-0.04%/yr), Union County population in 2025 would be 4,519 [0].
Historical population of Union County for period 1890-2014 [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
[1890-1900] +INF %/yr
[1900-1910] +9.68 %/yr
[1910-1920] +3.88 %/yr
[1920-1930] -4.05 %/yr
[1930-1940] -1.92 %/yr
[1940-1950] -2.08 %/yr
[1950-1960] -1.93 %/yr
[1960-1970] -2.07 %/yr
[1970-1980] -0.41 %/yr
[1980-1990] -1.35 %/yr
[1990-2000] +0.16 %/yr
[2000-2005] +0.04 %/yr
[2005-2010] +1.62 %/yr
[2010-2014] -0.04 %/yr
Looking for settlements in Union County? Visit this page: Settlements in Union County, NM
Population of Union County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 108 | 102 | 210 |
| 5 to 9 | 117 | 108 | 225 |
| 10 to 14 | 113 | 109 | 222 |
| 15 to 19 | 129 | 95 | 224 |
| 20 to 24 | 189 | 99 | 288 |
| 25 to 29 | 226 | 89 | 315 |
| 30 to 34 | 205 | 102 | 307 |
| 35 to 39 | 174 | 87 | 261 |
| 40 to 44 | 165 | 104 | 269 |
| 45 to 49 | 155 | 100 | 255 |
| 50 to 54 | 177 | 135 | 312 |
| 55 to 59 | 173 | 140 | 313 |
| 60 to 64 | 130 | 118 | 248 |
| 65 to 69 | 117 | 120 | 237 |
| 70 to 74 | 98 | 113 | 211 |
| 75 to 79 | 75 | 82 | 157 |
| 80 to 84 | 57 | 69 | 126 |
| 85+ | 36 | 81 | 117 |
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 | 2267 | 1782 | 4,049 |
| WA | 2222 | 1740 | 3,962 |
| NH | 1387 | 1149 | 2,536 |
| NHWAC | 1258 | 1116 | 2,374 |
| NHWA | 1227 | 1093 | 2,320 |
| H | 1057 | 704 | 1,761 |
| HWAC | 1009 | 666 | 1,675 |
| HWA | 995 | 647 | 1,642 |
| IAC | 105 | 79 | 184 |
| IA | 75 | 55 | 130 |
| BAC | 96 | 13 | 109 |
| NHIAC | 61 | 33 | 94 |
| TOM | 47 | 47 | 94 |
| HIAC | 44 | 46 | 90 |
| NHBAC | 81 | 7 | 88 |
| BA | 81 | 3 | 84 |
| NHBA | 72 | 2 | 74 |
| HIA | 37 | 36 | 73 |
| NHTOM | 33 | 27 | 60 |
| NHIA | 38 | 19 | 57 |
| AAC | 22 | 20 | 42 |
| NHAAC | 19 | 16 | 35 |
| HTOM | 14 | 20 | 34 |
| AA | 17 | 8 | 25 |
| NHAA | 15 | 8 | 23 |
| HBAC | 15 | 6 | 21 |
| HBA | 9 | 1 | 10 |
| NAC | 3 | 6 | 9 |
| HAAC | 3 | 4 | 7 |
| NHNAC | 3 | 4 | 7 |
| NA | 2 | 0 | 2 |
| NHNA | 2 | 0 | 2 |
| HAA | 2 | 0 | 2 |
| HNAC | 0 | 2 | 2 |
| HNA | 0 | 0 | 0 |
• Las Animas County population
65.4 mi, 
331°
• Colfax County
65.2 mi, 
277°
• Dallam County
51 mi, 
105°
• Hartley County
65.8 mi, 
132°
• Mora County
87.8 mi, 
246°
• Baca County
76.7 mi, 
42°
• Sherman County
88.9 mi, 
99°
• Cimarron County
56.1 mi, 
71°
• Oldham County
89.7 mi, 
146°
• Harding County
48.2 mi, 
205°
[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
*Colfax, Mora, San Miguel New Mexico Notes
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