Last official estimated population of Fairfax County was 1,086,723 (year 2014)[1]. This was 0.341% of total US population and 13% of total Virginia state population. Area of Fairfax County is 406.1 mi² (=1051.7 km²), in this year population density was 2,676.14 p/mi². If population growth rate would be same as in period 2010-2014 (+0.12%/yr), Fairfax County population in 2025 would be 1,100,584 [0].
Historical population of Fairfax 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] +0.78 %/yr
[1800-1810] -0.16 %/yr
[1810-1820] -1.39 %/yr
[1820-1830] -2.12 %/yr
[1830-1840] +0.18 %/yr
[1840-1850] +1.32 %/yr
[1850-1860] +1.03 %/yr
[1860-1870] +0.91 %/yr
[1870-1880] +2.15 %/yr
[1880-1890] +0.39 %/yr
[1890-1900] +1.1 %/yr
[1900-1910] +1.01 %/yr
[1910-1920] +0.66 %/yr
[1920-1930] +1.42 %/yr
[1930-1940] +4.94 %/yr
[1940-1950] +9.19 %/yr
[1950-1960] +10.81 %/yr
[1960-1970] +5.16 %/yr
[1970-1980] +2.75 %/yr
[1980-1990] +3.21 %/yr
[1990-2000] +1.71 %/yr
[2000-2005] +1 %/yr
[2005-2010] +1.19 %/yr
[2010-2014] +0.12 %/yr
Looking for settlements in Fairfax County? Visit this page: Settlements in Fairfax County, VA
Population of Fairfax County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 38988 | 37349 | 76,337 |
| 5 to 9 | 38484 | 36706 | 75,190 |
| 10 to 14 | 38137 | 36605 | 74,742 |
| 15 to 19 | 37277 | 34945 | 72,222 |
| 20 to 24 | 34323 | 32968 | 67,291 |
| 25 to 29 | 39400 | 37262 | 76,662 |
| 30 to 34 | 42627 | 42515 | 85,142 |
| 35 to 39 | 40658 | 41559 | 82,217 |
| 40 to 44 | 41232 | 42933 | 84,165 |
| 45 to 49 | 41121 | 43207 | 84,328 |
| 50 to 54 | 42678 | 44350 | 87,028 |
| 55 to 59 | 38334 | 40286 | 78,620 |
| 60 to 64 | 30327 | 32776 | 63,103 |
| 65 to 69 | 23637 | 25251 | 48,888 |
| 70 to 74 | 15081 | 16648 | 31,729 |
| 75 to 79 | 9389 | 10982 | 20,371 |
| 80 to 84 | 6058 | 7822 | 13,880 |
| 85+ | 5474 | 10149 | 15,623 |
Fairfax 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 | 467925 | 483211 | 951,136 |
| WAC | 398812 | 395938 | 794,750 |
| WA | 380309 | 377552 | 757,861 |
| NHWAC | 311383 | 312376 | 623,759 |
| NHWA | 295460 | 296602 | 592,062 |
| AAC | 116101 | 126857 | 242,958 |
| NHAAC | 113973 | 124682 | 238,655 |
| AA | 103439 | 114442 | 217,881 |
| NHAA | 102464 | 113457 | 215,921 |
| H | 95300 | 91102 | 186,402 |
| HWAC | 87429 | 83562 | 170,991 |
| HWA | 84849 | 80950 | 165,799 |
| BAC | 60888 | 64724 | 125,612 |
| NHBAC | 56279 | 59864 | 116,143 |
| BA | 54904 | 58296 | 113,200 |
| NHBA | 51408 | 54609 | 106,017 |
| TOM | 19993 | 20014 | 40,007 |
| NHTOM | 17217 | 17188 | 34,405 |
| IAC | 7659 | 7355 | 15,014 |
| HBAC | 4609 | 4860 | 9,469 |
| HIAC | 4067 | 3656 | 7,723 |
| IA | 4019 | 3530 | 7,549 |
| NHIAC | 3592 | 3699 | 7,291 |
| HBA | 3496 | 3687 | 7,183 |
| HTOM | 2776 | 2826 | 5,602 |
| HIA | 2977 | 2542 | 5,519 |
| HAAC | 2128 | 2175 | 4,303 |
| NAC | 1439 | 1396 | 2,835 |
| NHNAC | 1061 | 1101 | 2,162 |
| NHIA | 1042 | 988 | 2,030 |
| HAA | 975 | 985 | 1,960 |
| NA | 561 | 479 | 1,040 |
| NHNA | 334 | 367 | 701 |
| HNAC | 378 | 295 | 673 |
| HNA | 227 | 112 | 339 |
• Montgomery County population
21.6 mi, 
10°
• Prince George's County
22.9 mi, 
90°
• District of Columbia
14.7 mi, 
69°
• Prince William County
14.2 mi, 
231°
• Arlington County
9.9 mi, 70°
• Alexandria city
10.2 mi, 93°
• Manassas city
12.7 mi, 
243°
• Fairfax city
2.1 mi, 
319°
• Manassas Park city
10.3 mi, 
246°
• Falls Church city
6.5 mi, 
54°
[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 18 Virginia Notes
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