Last official estimated population of Arapahoe County was 574,577 (year 2014)[1]. This was 0.18% of total US population and 10.5% of total Colorado state population. Area of Arapahoe County is 805.5 mi² (=2086.1 km²), in this year population density was 713.36 p/mi². If population growth rate would be same as in period 2010-2014 (+0.11%/yr), Arapahoe County population in 2026 would be 582,369 [0].
Historical population of Arapahoe County for period 1870-2014 [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
[1870-1880] +18.92 %/yr
[1880-1890] +13.08 %/yr
[1890-1900] +1.48 %/yr
[1900-1910] -23.68 %/yr
[1910-1920] +2.98 %/yr
[1920-1930] +5.1 %/yr
[1930-1940] +3.57 %/yr
[1940-1950] +4.95 %/yr
[1950-1960] +8.09 %/yr
[1960-1970] +3.64 %/yr
[1970-1980] +6.12 %/yr
[1980-1990] +2.92 %/yr
[1990-2000] +2.24 %/yr
[2000-2005] +1.42 %/yr
[2005-2010] +1.75 %/yr
[2010-2014] +0.11 %/yr
Looking for settlements in Arapahoe County? Visit this page: Settlements in Arapahoe County, CO
Population of Arapahoe County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 20667 | 19691 | 40,358 |
| 5 to 9 | 22392 | 21111 | 43,503 |
| 10 to 14 | 21809 | 20888 | 42,697 |
| 15 to 19 | 20083 | 18776 | 38,859 |
| 20 to 24 | 20293 | 19624 | 39,917 |
| 25 to 29 | 22823 | 22702 | 45,525 |
| 30 to 34 | 23867 | 23168 | 47,035 |
| 35 to 39 | 21800 | 21940 | 43,740 |
| 40 to 44 | 21936 | 22150 | 44,086 |
| 45 to 49 | 19972 | 20640 | 40,612 |
| 50 to 54 | 20939 | 22257 | 43,196 |
| 55 to 59 | 19689 | 21352 | 41,041 |
| 60 to 64 | 16399 | 18340 | 34,739 |
| 65 to 69 | 12759 | 14339 | 27,098 |
| 70 to 74 | 7918 | 9383 | 17,301 |
| 75 to 79 | 5130 | 6522 | 11,652 |
| 80 to 84 | 3352 | 4950 | 8,302 |
| 85+ | 3078 | 6082 | 9,160 |
Arapahoe 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 | 249472 | 255959 | 505,431 |
| NH | 246395 | 256373 | 502,768 |
| WA | 239333 | 245503 | 484,836 |
| NHWAC | 196572 | 204082 | 400,654 |
| NHWA | 188608 | 195891 | 384,499 |
| H | 58511 | 57542 | 116,053 |
| HWAC | 52900 | 51877 | 104,777 |
| HWA | 50725 | 49612 | 100,337 |
| BAC | 40091 | 39430 | 79,521 |
| NHBAC | 36466 | 35593 | 72,059 |
| BA | 34185 | 33462 | 67,647 |
| NHBA | 31730 | 30785 | 62,515 |
| AAC | 19936 | 23195 | 43,131 |
| NHAAC | 18737 | 21999 | 40,736 |
| AA | 15824 | 18990 | 34,814 |
| NHAA | 15248 | 18428 | 33,676 |
| TOM | 11428 | 11738 | 23,166 |
| NHTOM | 8967 | 9223 | 18,190 |
| IAC | 6635 | 6907 | 13,542 |
| HBAC | 3625 | 3837 | 7,462 |
| NHIAC | 3356 | 3714 | 7,070 |
| IA | 3389 | 3422 | 6,811 |
| HIAC | 3279 | 3193 | 6,472 |
| HBA | 2455 | 2677 | 5,132 |
| HTOM | 2461 | 2515 | 4,976 |
| HIA | 2123 | 1988 | 4,111 |
| NAC | 1448 | 1513 | 2,961 |
| NHIA | 1266 | 1434 | 2,700 |
| HAAC | 1199 | 1196 | 2,395 |
| NHNAC | 1127 | 1178 | 2,305 |
| NA | 747 | 800 | 1,547 |
| NHNA | 576 | 612 | 1,188 |
| HAA | 576 | 562 | 1,138 |
| HNAC | 321 | 335 | 656 |
| HNA | 171 | 188 | 359 |
• El Paso County population
57.4 mi, 
190°
• Denver County
30.3 mi, 
285°
• Jefferson County
48.8 mi, 
264°
• Adams County
15.9 mi, 
359°
• Douglas County
38.6 mi, 
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• Weld County
62.9 mi, 356°
• Broomfield County
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• Morgan County
50.8 mi, 
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• Elbert County
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• Lincoln County
62.9 mi, 
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[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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