Washington County, IL Elevation & Topographic Map

Topographic elevation map of Washington County, Illinois, shaded from 380 ft on the west side to 600 ft on the east side
Elevation
600 ft 185 m550 ft 165 m520 ft 160 m460 ft 140 m410 ft 125 m380 ft 115 m
Contours every 500 ft, bold every 2,500 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.
County area
Fades everything outside the official county boundary (US Census).

Elevation Data

Washington County averages about 480 ft (150 m) above sea level across all its land. Its ground runs from 380 ft on the west side to 600 ft on the east side.

Average elevation
480 ft 150 m
all land inside the county
Highest
600 ft 185 m
on the east side
Lowest
380 ft 115 m
on the west side

Washington County spans about 220 ft of height, so no single spot tells the whole story. The ruler shows where most of its land lies, and where the other numbers you'll see come from.

FigureElevation
Average of all land480 ft150 m
Highest point
Inside the county, on the east side
600 ft185 m
Lowest point
Inside the county, on the west side
380 ft115 m

Elevation profile, west to east

30 mi west to east through Nashville Township.

Topographic Map

Topographic elevation map of Washington County, Illinois, shaded from 380 ft on the west side to 600 ft on the east side
County boundary (dashed) over shaded terrain, with contours every 10 ft (3 m).
Location
County in Illinois, United States
Population
13,535 2024 est.
Land area
562.6 sq mi + 1.3 sq mi water
Density
24 per sq mi
Time zone
Central UTC−6 / −5
Landform region
Central Lowland
Drains to
Gulf of America
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Sources: U.S. Census Bureau, USGS

Nearby Places

Neighboring counties sharing a border, by average

  1. Marion County530 ft
  2. Jefferson County490 ft
  3. Washington County480 ft
  4. St. Clair County470 ft
  5. Randolph County470 ft
  6. Perry County460 ft
  7. Clinton County450 ft

Rankings by average elevation

All 30 towns in Washington County by typical elevation
  1. Ashley550 ft
  2. Ashley Township550 ft
  3. Irvington550 ft
  4. Richview Township540 ft
  5. Richview540 ft
  6. Irvington Township540 ft
  7. Radom530 ft
  8. Du Bois Township530 ft
  9. Du Bois530 ft
  10. Beaucoup Township520 ft
  11. Hoyleton520 ft
  12. Oakdale520 ft
  13. Nashville Township510 ft
  14. Nashville510 ft
  15. Oakdale Township510 ft
  16. Hoyleton Township510 ft
  17. Pilot Knob Township500 ft
  18. Centralia partly500 ft
  19. Wamac partly500 ft
  20. Bolo Township490 ft
  21. Lively Grove Township480 ft
  22. Addieville470 ft
  23. Plum Hill Township470 ft
  24. New Minden460 ft
  25. Covington Township450 ft
  26. Venedy450 ft
  27. Johannisburg Township450 ft
  28. Okawville Township440 ft
  29. Okawville440 ft
  30. Venedy Township420 ft
How we measure
  • Average: every USGS 3DEP bare-earth cell of land inside the Census county boundary (TIGER/Line, Jan 1 2026), weighted equally, on a 1 arc-second (≈100 ft, 30 m) grid. Land means the boundary minus Census area water.
  • Highest and lowest: the highest land cell. Lowest: the lowest land cell; coastal ground within 3 ft (1 m) of named tidal water counts as sea level.
  • Nearby Places: neighboring counties and rankings use each one's average elevation, on its own grid, the same figure its page shows. Peaks and hills: the highest summits inside the county with at least 980 ft (300 m) of prominence, then the highest federal (GNIS) summits inside it 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).
  • Towns: each town's typical elevation (population-weighted median of its own 2020 blocks at 1 arc-second); a town is listed when any of its 2020 residents live in the county.
  • 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 (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.
  • Sources: USGS 3DEP, GNIS, Watershed Boundary Dataset and physiographic provinces; U.S. Census Bureau (TIGER boundaries and water, 2020 blocks, 2024 population estimates, county adjacency); NOAA NGS survey heights; BTS time zones. All public domain.