Hamilton County, IL Elevation & Topographic Map

Topographic elevation map of Hamilton County, Illinois, shaded from 350 ft on the southeast side to 630 ft on the northwest side
Elevation
630 ft 190 m560 ft 170 m520 ft 160 m450 ft 140 m380 ft 115 m350 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

Hamilton County averages about 440 ft (135 m) above sea level across all its land. Its ground runs from 350 ft on the southeast side to 630 ft on the northwest side.

Average elevation
440 ft 135 m
all land inside the county
Highest
630 ft 190 m
on the northwest side
Lowest
350 ft 105 m
on the southeast side

Hamilton County spans about 280 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 land440 ft135 m
Highest point
Inside the county, on the northwest side
630 ft190 m
Lowest point
Inside the county, on the southeast side
350 ft105 m

Elevation profile, south to north

24 mi south to north through McLeansboro Township.

Topographic Map

Topographic elevation map of Hamilton County, Illinois, shaded from 350 ft on the southeast side to 630 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
7,818 2024 est.
Land area
434.7 sq mi + 1.2 sq mi water
Density
18 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. Jefferson County490 ft
  2. Hamilton County440 ft
  3. Franklin County440 ft
  4. Wayne County440 ft
  5. Saline County420 ft
  6. White County400 ft
  7. Gallatin County390 ft

Rankings by average elevation

Peaks and hills highest inside

  • Radio Hill560 ft
  • Bunker Hill, Hamilton County560 ft
All 17 towns in Hamilton County by typical elevation
  1. Flannigan Township530 ft
  2. South Flannigan Township520 ft
  3. Dahlgren500 ft
  4. Macedonia500 ft
  5. Dahlgren Township500 ft
  6. Knight Prairie Township490 ft
  7. McLeansboro460 ft
  8. McLeansboro Township460 ft
  9. Belle Prairie City450 ft
  10. Crook Township440 ft
  11. South Twigg Township430 ft
  12. South Crouch Township430 ft
  13. Crouch Township420 ft
  14. Beaver Creek Township420 ft
  15. Twigg Township420 ft
  16. Mayberry Township380 ft
  17. Broughton380 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, 350 ft at 37.9093° N, 88.4163° 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.