Union Mill, VA Elevation & Topographic Map
Elevation
440 ft 135 m370 ft 115 m340 ft 105 m280 ft 85 m210 ft 65 m180 ft 55 m
Contours every 100 ft, bold every 500 ft
USGS 3DEP · U.S. Census Bureau
How to use this mapviews, tools and data
- Elevation
- Ground colored by height from green (lowest) to white (highest), with contour lines every 40–500 ft (USGS data).
- Satellite
- A 2016 satellite photo at 33 ft (10 m) detail; contours off.
- 3D
- Tilt and turn the terrain; hills are raised 1.5×, or set ×1 for true height.
- Click or tap anywhere
- The exact elevation of that spot in ft and m.
- Measure
- Pick two points for the climb, descent and grade along a straight line.
- Area
- Fades everything outside the official CDP boundary (US Census).
Elevation Data
Union Mill sits at about 370 ft (110 m) above sea level, worked out from 2020 Census block heights on USGS 3DEP, weighted by residents.
Typical elevation
370 ft 110 m
most residents: 300–410 ft
Lowest
180 ft 55 m
on the south side
Highest
440 ft 135 m
on the north side
Average
330 ft 100 m
all land inside the CDP boundary
Union Mill spans about 260 ft of height, so no single spot tells the whole story. The ruler shows where its people live, and where the other numbers you'll see come from.
| Figure | Elevation |
|---|---|
| Typical Where people live: half of residents higher, half lower | 370 ft110 m |
| Highest point Inside the CDP boundary, on the north side | 440 ft135 m |
| Lowest point Inside the CDP boundary, on the south side | 180 ft55 m |
| Airport (IAD) FAA airport elevation, the highest point of its runways, 7.9 mi northwest of the CDP boundary | 312 ft95 m |
| Average of all land | 330 ft100 m |
Elevation profile, south to north
2.9 mi south to north through the middle of Union Mill.
Topographic Map
- Location
- Unincorporated community (census-designated place) in Fairfax County, Virginia, United States
- Population
- 4,997 2020 Census
- Land area
- 10.0 sq mi + 0.1 sq mi water
- Density
- 500 per sq mi
- Coordinates
- 38.8081° N, 77.3797° W
- Time zone
- Eastern UTC−5 / −4
- Landform region
- Piedmont
- Drains to
- Potomac River → Atlantic Ocean
- Airport
- Washington Dulles International (IAD) 312 ft
- ZIP codes 3
- 20124 22030 22039
⤓ Download this map
WebP, 1200 × 900. Free to use: credit “ElevationOf.com” with a link to this page.
Sources: U.S. Census Bureau, USGS, FAA
Nearby Places
Nearby towns by typical elevation
- Fair Oaks440 ft
- Fair Lakes410 ft
- Braddock410 ft
- George Mason410 ft
- Burke Centre370 ft
- Union Mill370 ft
- Kings Park West370 ft
- Fairfax Station370 ft
- Centreville290 ft
- Clifton260 ft
- Yorkshire210 ft
Rankings by typical elevation
- Towns in Virginia391st highest of 700
- Towns in Fairfax County19th highest of 69
Peaks and hills nearest, by height
- Stony Man4,011 ft
- Sugarloaf3,450 ft
- Old Rag Mountain3,285 ft
- Third Hill Mountain2,170 ft
- Quirauk Mountain2,140 ft
How we measure
- Typical elevation: the population-weighted median: every 2020 Census block inside the CDP boundary, at its USGS 3DEP height, weighted by the people who live there. Half of residents live higher, half lower.
- Lowest, highest, average: USGS 3DEP bare-earth heights on a 1 arc-second (≈100 ft, 30 m) grid, land only, inside the Census CDP boundary (TIGER, Jan 1 2026).
- Nearby Places: nearby towns and rankings use each town's typical elevation, so every town is compared like for like. Rankings count every city, town, township and census-designated place, including places inside a town. Peaks and hills: the nearest summits with at least 980 ft (300 m) of prominence within 62 mi (100 km), then federal (GNIS) summits within 16 mi (25 km) when there are fewer than 5; each is the 3DEP top on a ~7 ft (2 m) window, or the NGS published height when a usable survey mark sits within 160 ft (50 m) of it (shown as published).
- Rounding: computed heights are rounded to 10 ft (5 m), or to 1 ft (1 m) under 100 ft; 3DEP is good to about a meter, not a foot. Published figures (FAA airport elevation, NGS survey heights) are shown as their publisher gives them.
- Datum: North American Vertical Datum of 1988 (NAVD 88). NGS plans to replace NAVD 88 with a new datum (NAPGD2022); heights will then shift slightly.
- Union Mill is an unincorporated community; figures cover the census-designated place, a statistical area.
- Sources: USGS 3DEP, GNIS, Watershed Boundary Dataset and physiographic provinces; U.S. Census Bureau (boundaries, 2020 blocks, Gazetteer areas, ZIP code areas); FAA airport data; BTS time zones; NOAA NGS survey heights. All public domain.