Randolph County, IL Elevation & Topographic Map

Topographic elevation map of Randolph County, Illinois, shaded from 340 ft on the southeast side to 740 ft on the southeast side
Elevation
740 ft 225 m640 ft 195 m590 ft 180 m490 ft 150 m390 ft 120 m340 ft 105 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

Randolph County averages about 470 ft (145 m) above sea level across all its land. Its ground runs from 340 ft on the southeast side to 740 ft on the southeast side.

Average elevation
470 ft 145 m
all land inside the county
Highest
740 ft 225 m
on the southeast side
Lowest
340 ft 105 m
on the southeast side

Randolph County spans about 400 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 land470 ft145 m
Highest point
Inside the county, on the southeast side
740 ft225 m
Lowest point
Inside the county, on the southeast side
340 ft105 m

Elevation profile, south to north

23 mi south to north through Chester.

Topographic Map

Topographic elevation map of Randolph County, Illinois, shaded from 340 ft on the southeast side to 740 ft on the southeast side
County boundary (dashed) over shaded terrain, with contours every 40 ft (12 m).
Location
County in Illinois, United States
Population
29,903 2024 est.
Land area
575.4 sq mi + 21.7 sq mi water
Density
52 per sq mi
Time zone
Central UTC−6 / −5
Landform region
Central Lowland 96%
Drains to
Gulf of America 92%
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Sources: U.S. Census Bureau, USGS

Nearby Places

Neighboring counties sharing a border, by average

  1. Ste. Genevieve County, MO690 ft
  2. Perry County, MO550 ft
  3. Monroe County520 ft
  4. Washington County480 ft
  5. St. Clair County470 ft
  6. Randolph County470 ft
  7. Perry County460 ft
  8. Jackson County460 ft

Rankings by average elevation

All 14 towns in Randolph County by typical elevation
  1. Coulterville550 ft
  2. Ellis Grove550 ft
  3. Chester550 ft
  4. Sparta530 ft
  5. Tilden510 ft
  6. Percy470 ft
  7. Red Bud470 ft
  8. Baldwin460 ft
  9. Ruma450 ft
  10. Evansville440 ft
  11. Steeleville430 ft
  12. Prairie du Rocher390 ft
  13. Rockwood390 ft
  14. Kaskaskia370 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.