Carroll County, IL Elevation & Topographic Map

Topographic elevation map of Carroll County, Illinois, shaded from 580 ft on the southwest side to 1,070 ft on the east side
Elevation
1,070 ft 325 m940 ft 290 m880 ft 270 m760 ft 230 m640 ft 195 m580 ft 175 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

Carroll County averages about 780 ft (235 m) above sea level across all its land. Its ground runs from 580 ft on the southwest side to 1,070 ft on the east side.

Average elevation
780 ft 235 m
all land inside the county
Highest
1,070 ft 325 m
on the east side
Lowest
580 ft 175 m
on the southwest side

Carroll County spans about 490 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 land780 ft235 m
Highest point
Inside the county, on the east side
1,070 ft325 m
Lowest point
Inside the county, on the southwest side
580 ft175 m

Elevation profile, west to east

24 mi west to east through Savanna Township.

Topographic Map

Topographic elevation map of Carroll County, Illinois, shaded from 580 ft on the southwest side to 1,070 ft on the east side
County boundary (dashed) over shaded terrain, with contours every 40 ft (12 m).
Location
County in Illinois, United States
Population
15,444 2024 est.
Land area
445.4 sq mi + 21.6 sq mi water
Density
35 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. Stephenson County870 ft
  2. Jo Daviess County840 ft
  3. Ogle County810 ft
  4. Jackson County, IA810 ft
  5. Carroll County780 ft
  6. Clinton County, IA720 ft
  7. Whiteside County660 ft

Rankings by average elevation

All 20 towns in Carroll County by typical elevation
  1. Shannon930 ft
  2. Cherry Grove-Shannon Township920 ft
  3. Lanark860 ft
  4. Rock Creek-Lima Township860 ft
  5. Lake Carroll820 ft
  6. Freedom Township810 ft
  7. Salem Township, Carroll County800 ft
  8. Fairhaven Township790 ft
  9. Chadwick790 ft
  10. Elkhorn Grove Township790 ft
  11. Mount Carroll790 ft
  12. Mount Carroll Township780 ft
  13. Woodland Township, Carroll County760 ft
  14. Milledgeville760 ft
  15. Wysox Township760 ft
  16. Washington Township, Carroll County690 ft
  17. Savanna630 ft
  18. Savanna Township620 ft
  19. York Township, Carroll County610 ft
  20. Thomson610 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, 550 ft at 42.0724° N, 90.0893° 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.