Clay County, IL Elevation & Topographic Map

Elevation

640 ft 195 m580 ft 175 m550 ft 170 m490 ft 150 m430 ft 130 m400 ft 120 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

Clay County averages about 490 ft (150 m) above sea level across all its land. Its ground runs from 400 ft on the southeast side to 640 ft on the west side.

Average elevation

490 ft 150 m

all land inside the county

Highest

640 ft 195 m

on the west side

Lowest

400 ft 120 m

on the southeast side

Clay 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.

Figure	Elevation
Average of all land	490 ft150 m
Highest point Inside the county, on the west side	640 ft195 m
Lowest point Inside the county, on the southeast side	400 ft120 m

Elevation profile, west to east

23 mi west to east through Harter Township.

Topographic Map

Location: County in Illinois, United States
Population: 12,821 2024 est.
Land area: 468.4 sq mi + 1.2 sq mi water
Density: 27 per sq mi
Time zone: Central UTC−6 / −5
Landform region: Central Lowland
Drains to: Gulf of America

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WebP, 1200 × 900. Free to use: credit “ElevationOf.com” with a link to this page.

Sources: U.S. Census Bureau, USGS

Nearby Places

Neighboring counties sharing a border, by average

Effingham County580 ft
Fayette County550 ft
Marion County530 ft
Jasper County530 ft
Clay County490 ft
Richland County480 ft
Wayne County440 ft

Rankings by average elevation

Counties in Illinois81st highest of 102
Counties in the United States2,342nd highest of 3,151

Peaks and hills highest inside

Turkey Point500 ft
Indian Point490 ft

All 18 towns in Clay County by typical elevation

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.
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.