Cass County, IL Elevation & Topographic Map

Topographic elevation map of Cass County, Illinois, shaded from 420 ft on the west side to 680 ft near the middle
Elevation
680 ft 205 m610 ft 185 m580 ft 175 m520 ft 155 m450 ft 135 m420 ft 130 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

Cass County averages about 540 ft (165 m) above sea level across all its land. Its ground runs from 420 ft on the west side to 680 ft near the middle.

Average elevation
540 ft 165 m
all land inside the county
Highest
680 ft 205 m
near the middle
Lowest
420 ft 125 m
on the west side

Cass County spans about 260 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 land540 ft165 m
Highest point
Inside the county, near the middle
680 ft205 m
Lowest point
Inside the county, on the west side
420 ft125 m

Elevation profile, west to east

24 mi west to east through Beardstown Township.

Topographic Map

Topographic elevation map of Cass County, Illinois, shaded from 420 ft on the west side to 680 ft near the middle
County boundary (dashed) over shaded terrain, with contours every 20 ft (6 m).
Location
County in Illinois, United States
Population
12,713 2024 est.
Land area
375.8 sq mi + 7.9 sq mi water
Density
34 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. Brown County630 ft
  2. Morgan County620 ft
  3. Sangamon County600 ft
  4. Schuyler County590 ft
  5. Menard County580 ft
  6. Cass County540 ft
  7. Mason County510 ft

Rankings by average elevation

Peaks and hills highest inside

  • Shick Shack Hill620 ft
All 16 towns in Cass County by typical elevation
  1. Ashland Township630 ft
  2. Ashland630 ft
  3. Philadelphia Township620 ft
  4. Virginia610 ft
  5. Virginia Township610 ft
  6. Sangamon Valley Township610 ft
  7. Newmansville Township590 ft
  8. Arenzville Township520 ft
  9. Arenzville510 ft
  10. Panther Creek Township490 ft
  11. Bluff Springs Township470 ft
  12. Chandlerville470 ft
  13. Chandlerville Township460 ft
  14. Hagener Township450 ft
  15. Beardstown440 ft
  16. Beardstown Township440 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.
  • Pits: the lowest point is the lowest ground outside closed hollows (quarry floors, mine pits, terrain-model artifacts): any hollow under 0.4 sq mi (1 km²), and any hollow under 2 sq mi (5 km²) whose floor is more than 100 ft (30 m) below its rim; and outside patches below sea level of under 0.4 sq mi (1 km²). The single lowest 3DEP cell, 420 ft at 39.9432° N, 90.5115° W, is in such a hollow or patch and is not counted.
  • 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.