McNair, VA Elevation & Topographic Map

Topographic elevation map of McNair, Virginia, shaded from 280 ft on the northwest side to 410 ft on the east side
Elevation
410 ft 125 m380 ft 115 m360 ft 110 m330 ft 100 m300 ft 90 m280 ft 85 m
Contours every 40 ft, bold every 200 ft
USGS 3DEP · U.S. Census Bureau
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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

McNair sits at about 350 ft (105 m) above sea level, worked out from 2020 Census block heights on USGS 3DEP, weighted by residents.

Typical elevation
350 ft 105 m
most residents: 320–410 ft
Lowest
280 ft 85 m
on the northwest side
Highest
410 ft 125 m
on the east side
Average
350 ft 105 m
all land inside the CDP boundary

McNair spans about 130 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.

FigureElevation
Typical
Where people live: half of residents higher, half lower
350 ft105 m
Highest point
Inside the CDP boundary, on the east side
410 ft125 m
Lowest point
Inside the CDP boundary, on the northwest side
280 ft85 m
Airport (IAD)
FAA airport elevation, the highest point of its runways, 1.7 mi west of the CDP boundary
312 ft95 m
Average of all land350 ft105 m

Elevation profile, west to east

2.0 mi west to east through the middle of McNair.

Topographic Map

Topographic elevation map of McNair, Virginia, shaded from 280 ft on the northwest side to 410 ft on the east side
CDP boundary (dashed) over shaded terrain, with contours every 10 ft (3 m).
Location
Unincorporated community (census-designated place) in Fairfax County, Virginia, United States
Population
21,598 2020 Census
Land area
2.0 sq mi
Density
10,577 per sq mi
Coordinates
38.9486° N, 77.4109° 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 1
20171
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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

  1. Navy400 ft
  2. Herndon390 ft
  3. Reston380 ft
  4. Hutchison380 ft
  5. Franklin Farm370 ft
  6. Oak Grove370 ft
  7. Floris360 ft
  8. Sully Square350 ft
  9. McNair350 ft
  10. Chantilly330 ft
  11. Sterling320 ft

Rankings by typical elevation

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.
  • McNair 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.