Last official estimated population of Loudoun County was 315,505 (year 2014)[1]. This was 0.099% of total US population and 3.8% of total Virginia state population. Area of Loudoun County is 521.3 mi² (=1350.3 km²), in this year population density was 605.19 p/mi². If population growth rate would be same as in period 2010-2014 (+0.25%/yr), Loudoun County population in 2021 would be 321,173 [0].
Historical population of Loudoun 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] +0.79 %/yr
[1800-1810] +0.39 %/yr
[1810-1820] +0.62 %/yr
[1820-1830] -0.34 %/yr
[1830-1840] -0.71 %/yr
[1840-1850] +0.78 %/yr
[1850-1860] -0.14 %/yr
[1860-1870] -0.4 %/yr
[1870-1880] +1.22 %/yr
[1880-1890] -0.15 %/yr
[1890-1900] -0.58 %/yr
[1900-1910] -0.36 %/yr
[1910-1920] -0.28 %/yr
[1920-1930] -0.36 %/yr
[1930-1940] +0.22 %/yr
[1940-1950] +0.41 %/yr
[1950-1960] +1.5 %/yr
[1960-1970] +4.23 %/yr
[1970-1980] +4.45 %/yr
[1980-1990] +4.14 %/yr
[1990-2000] +7 %/yr
[2000-2005] +8.49 %/yr
[2005-2010] +4.15 %/yr
[2010-2014] +0.25 %/yr
Looking for settlements in Loudoun County? Visit this page: Settlements in Loudoun County, VA
Population of Loudoun County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 14507 | 13403 | 27,910 |
| 5 to 9 | 16141 | 15475 | 31,616 |
| 10 to 14 | 15536 | 15334 | 30,870 |
| 15 to 19 | 12302 | 11856 | 24,158 |
| 20 to 24 | 8858 | 8462 | 17,320 |
| 25 to 29 | 9556 | 9756 | 19,312 |
| 30 to 34 | 13311 | 14513 | 27,824 |
| 35 to 39 | 15044 | 16086 | 31,130 |
| 40 to 44 | 16722 | 16411 | 33,133 |
| 45 to 49 | 15046 | 15175 | 30,221 |
| 50 to 54 | 13738 | 13250 | 26,988 |
| 55 to 59 | 9973 | 9910 | 19,883 |
| 60 to 64 | 6886 | 7210 | 14,096 |
| 65 to 69 | 4949 | 5478 | 10,427 |
| 70 to 74 | 3194 | 3944 | 7,138 |
| 75 to 79 | 1982 | 2534 | 4,516 |
| 80 to 84 | 1360 | 1939 | 3,299 |
| 85+ | 1117 | 2092 | 3,209 |
Loudoun 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 | 155443 | 158784 | 314,227 |
| WAC | 134151 | 134589 | 268,740 |
| WA | 128206 | 128584 | 256,790 |
| NHWAC | 111409 | 112504 | 223,913 |
| NHWA | 106132 | 107201 | 213,333 |
| AAC | 34412 | 36044 | 70,456 |
| NHAAC | 33825 | 35382 | 69,207 |
| AA | 30601 | 32303 | 62,904 |
| NHAA | 30294 | 31932 | 62,226 |
| H | 24779 | 24044 | 48,823 |
| HWAC | 22742 | 22085 | 44,827 |
| HWA | 22074 | 21383 | 43,457 |
| BAC | 16248 | 16846 | 33,094 |
| NHBAC | 14905 | 15579 | 30,484 |
| BA | 13928 | 14350 | 28,278 |
| NHBA | 12940 | 13466 | 26,406 |
| TOM | 6378 | 6485 | 12,863 |
| NHTOM | 5643 | 5701 | 11,344 |
| IAC | 1891 | 1911 | 3,802 |
| HBAC | 1343 | 1267 | 2,610 |
| NHIAC | 1066 | 1117 | 2,183 |
| HBA | 988 | 884 | 1,872 |
| IA | 907 | 848 | 1,755 |
| HIAC | 825 | 794 | 1,619 |
| HTOM | 735 | 784 | 1,519 |
| HAAC | 587 | 662 | 1,249 |
| HIA | 585 | 523 | 1,108 |
| NAC | 454 | 506 | 960 |
| NHNAC | 322 | 356 | 678 |
| HAA | 307 | 371 | 678 |
| NHIA | 322 | 325 | 647 |
| NA | 202 | 258 | 460 |
| HNAC | 132 | 150 | 282 |
| NHNA | 112 | 159 | 271 |
| HNA | 90 | 99 | 189 |
• Fairfax County population
26.2 mi, 
131°
• Montgomery County
23.7 mi, 
80°
• Prince William County
27.6 mi, 
161°
• Fauquier County
25.3 mi, 
202°
• Jefferson County
19.7 mi, 
322°
• Manassas city
24.5 mi, 160°
• Fairfax city
24.1 mi, 130°
• Manassas Park city
23.9 mi, 
154°
• Clarke County
19 mi, 
277°
• Falls Church city
28.3 mi, 
118°
[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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