Iroquois County, IL Elevation & Topographic Map

Topographic elevation map of Iroquois County, Illinois, shaded from 580 ft on the northwest side to 820 ft on the southeast side
Elevation
820 ft 250 m760 ft 230 m730 ft 220 m670 ft 205 m610 ft 185 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

Iroquois County averages about 670 ft (205 m) above sea level across all its land. Its ground runs from 580 ft on the northwest side to 820 ft on the southeast side.

Average elevation
670 ft 205 m
all land inside the county
Highest
820 ft 250 m
on the southeast side
Lowest
580 ft 175 m
on the northwest side

Iroquois County spans about 240 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 land670 ft205 m
Highest point
Inside the county, on the southeast side
820 ft250 m
Lowest point
Inside the county, on the northwest side
580 ft175 m

Elevation profile, south to north

36 mi south to north through Watseka.

Topographic Map

Topographic elevation map of Iroquois County, Illinois, shaded from 580 ft on the northwest side to 820 ft on the southeast side
County boundary (dashed) over shaded terrain, with contours every 20 ft (6 m).
Location
County in Illinois, United States
Population
26,067 2024 est.
Land area
1,117.4 sq mi + 1.6 sq mi water
Density
23 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. Benton County, IN760 ft
  2. Ford County750 ft
  3. Vermilion County680 ft
  4. Newton County, IN670 ft
  5. Iroquois County670 ft
  6. Kankakee County650 ft

Rankings by average elevation

All 47 towns in Iroquois County by typical elevation
  1. Loda780 ft
  2. Loda Township770 ft
  3. Prairie Green Township750 ft
  4. Wellington700 ft
  5. Lovejoy Township700 ft
  6. Buckley700 ft
  7. Artesia Township700 ft
  8. Stockland Township690 ft
  9. Thawville690 ft
  10. Ridgeland Township680 ft
  11. Sheldon680 ft
  12. Sheldon Township680 ft
  13. Milks Grove Township680 ft
  14. Donovan670 ft
  15. Beaver Township670 ft
  16. Fountain Creek Township670 ft
  17. Beaverville670 ft
  18. Onarga670 ft
  19. Onarga Township670 ft
  20. Chebanse660 ft
  21. Beaverville Township660 ft
  22. Pigeon Grove Township660 ft
  23. Cissna Park660 ft
  24. Ashkum660 ft
  25. Ash Grove Township660 ft
  26. Milford660 ft
  27. Concord Township, Iroquois County660 ft
  28. Milford Township660 ft
  29. Clifton660 ft
  30. Ashkum Township660 ft
  31. Iroquois660 ft
  32. Chebanse Township660 ft
  33. Danforth650 ft
  34. Danforth Township650 ft
  35. Gilman650 ft
  36. Douglas Township, Iroquois County650 ft
  37. Crescent Township640 ft
  38. Crescent City640 ft
  39. Woodland640 ft
  40. Iroquois Township640 ft
  41. Belmont Township640 ft
  42. Papineau630 ft
  43. Watseka630 ft
  44. Papineau Township630 ft
  45. Middleport Township630 ft
  46. Martinton Township620 ft
  47. Martinton620 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, 540 ft at 40.9040° N, 88.0882° 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.