Mason District, Fairfax County, Virginia
Mason District is a magisterial district in Fairfax County, Virginia. About 121,925 people live there (2020–2024 estimate). It covers 23.1 sq mi (59.8 km²) of land and uses Eastern Time. It is a legal area with no government of its own.
- Population, 2020–2024 estimate
- 121,925 ± 3,175
- County
- Fairfax County
- School district
- Fairfax County Public Schools
- Land area
- 23.1 sq mi (59.8 km²)
- Type
- Magisterial districtNo government of its own
- Time zone
- Eastern TimeUTC-05:00 in January; UTC-04:00 in July
- Median household income
- $120,831 ± $3,414
- Median home value
- $680,300 ± $11,455
- Water area
- 0.31 sq mi (0.81 km²)
- State
- Virginia
- Census code (GEOID)
- 5105994543
- Coordinates (central point)
- 38.840580, -77.175563
These coordinates mark a central point for the area, not a street address. Population, income and home value: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 20, 2026.
Cities, towns and communities in Mason District, largest first
- Annandale (CDP)41,705 people
- West Falls Church (CDP)31,279 people
- Bailey's Crossroads (CDP)24,271 people
- Lincolnia (CDP)20,320 people
- Lake Barcroft (CDP)10,973 people
- Woodburn (CDP)9,503 people
- Seven Corners (CDP)9,371 people
These places’ central points lie inside Mason District. A place can reach across the line, and its government, if it has one, can be separate from the magisterial district’s.
Bordering areas, nearest first
- Falls Church (city)3.0 mi north
- Providence District4.1 mi northwest
- Alexandria (city)5.2 mi east
- Franconia District5.2 mi south
- Braddock District5.8 mi west
These towns, townships, cities and boroughs share a boundary with Mason District. Distances are straight lines between central points, not driving distances.
Other magisterial districts in Fairfax County, largest first
- Providence District132,006 people
- Hunter Mill District129,501 people
- Springfield District128,686 people
- Dranesville District128,130 people
- Franconia District128,060 people
- Sully District127,667 people
- Mount Vernon District126,560 people
- Braddock District125,302 people
People counts are American Community Survey 2020–2024 5-year estimates. See Fairfax County for its cities, ZIP Code areas and county seat.
Sunrise and sunset in Mason District
- Longest day
- 14 hours 54 minutes around June 21
- Shortest day
- 9 hours 27 minutes around December 21
- Earliest sunrise
- 5:42 AM around June 14
- Latest sunrise
- 7:41 AM the day before clocks go back in November
- Earliest sunset
- 4:46 PM around December 7
- Latest sunset
- 8:37 PM around June 28
Clocks go forward an hour on the second Sunday in March and back on the first Sunday in November, so sunrise and sunset jump an hour later in March and an hour earlier in November.
| Day | Sunrise | Sunset | Daylight |
|---|---|---|---|
| Jan 15 | 7:25 AM | 5:10 PM | 9 h 45 min |
| Feb 15 | 7:00 AM | 5:46 PM | 10 h 46 min |
| Mar 15 | 7:20 AM | 7:15 PM | 11 h 55 min |
| Apr 15 | 6:32 AM | 7:45 PM | 13 h 13 min |
| May 15 | 5:56 AM | 8:14 PM | 14 h 18 min |
| Jun 15 | 5:42 AM | 8:35 PM | 14 h 53 min |
| Jul 15 | 5:55 AM | 8:33 PM | 14 h 38 min |
| Aug 15 | 6:22 AM | 8:03 PM | 13 h 41 min |
| Sep 15 | 6:50 AM | 7:17 PM | 12 h 27 min |
| Oct 15 | 7:17 AM | 6:30 PM | 11 h 13 min |
| Nov 15 | 6:51 AM | 4:55 PM | 10 h 4 min |
| Dec 15 | 7:19 AM | 4:47 PM | 9 h 28 min |
Approximate times for a flat horizon at the central point; the days move by a day or so from year to year. Hills and weather can change what you see.
Before using this answer on a form
A magisterial district line is not always the line on your mail: a mailing address can name another town or post office, and school districts, ZIP Codes and tax districts follow their own lines. For taxes, voting or permits, check the full address with Fairfax County or the local office.
Find the township or town where you are now or find your county.