Grundy County, IL Elevation & Topographic Map

Topographic elevation map of Grundy County, Illinois, shaded from 480 ft on the north side to 710 ft on the northwest side
Elevation
710 ft 215 m650 ft 200 m620 ft 190 m570 ft 175 m510 ft 155 m480 ft 145 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

Grundy County averages about 590 ft (180 m) above sea level across all its land. Its ground runs from 480 ft on the north side to 710 ft on the northwest side.

Average elevation
590 ft 180 m
all land inside the county
Highest
710 ft 215 m
on the northwest side
Lowest
480 ft 145 m
on the north side

Grundy County spans about 230 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 land590 ft180 m
Highest point
Inside the county, on the northwest side
710 ft215 m
Lowest point
Inside the county, on the north side
480 ft145 m

Elevation profile, west to east

18 mi west to east through Aux Sable Township.

Topographic Map

Topographic elevation map of Grundy County, Illinois, shaded from 480 ft on the north side to 710 ft on the northwest side
County boundary (dashed) over shaded terrain, with contours every 20 ft (6 m).
Location
County in Illinois, United States
Population
53,835 2024 est.
Land area
418.1 sq mi + 12.4 sq mi water
Density
129 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. Livingston County680 ft
  2. Will County660 ft
  3. LaSalle County660 ft
  4. Kendall County650 ft
  5. Kankakee County650 ft
  6. Grundy County590 ft

Rankings by average elevation

All 34 towns in Grundy County by typical elevation
  1. Kinsman660 ft
  2. Highland Township650 ft
  3. Dwight partly630 ft
  4. Vienna Township630 ft
  5. Verona630 ft
  6. Goodfarm Township610 ft
  7. Aux Sable Township610 ft
  8. Minooka610 ft
  9. Nettle Creek Township610 ft
  10. Norman Township600 ft
  11. Channahon partly590 ft
  12. Mazon590 ft
  13. Godley partly590 ft
  14. Mazon Township590 ft
  15. Garfield Township590 ft
  16. Gardner590 ft
  17. South Wilmington590 ft
  18. Greenfield Township590 ft
  19. East Brooklyn580 ft
  20. Braceville580 ft
  21. Braidwood partly570 ft
  22. Braceville Township570 ft
  23. Coal City570 ft
  24. Diamond560 ft
  25. Felix Township560 ft
  26. Maine Township, Grundy County560 ft
  27. Carbon Hill560 ft
  28. Saratoga Township550 ft
  29. Goose Lake Township540 ft
  30. Erienna Township530 ft
  31. Morris530 ft
  32. Wauponsee Township530 ft
  33. Morris Township520 ft
  34. Seneca partly510 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, 380 ft at 41.3896° N, 88.3593° 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.