St. Clair County, IL Elevation & Topographic Map
Elevation
730 ft 225 m640 ft 195 m590 ft 180 m500 ft 155 m410 ft 125 m370 ft 110 m
Contours every 500 ft, bold every 2,500 ft
USGS 3DEP · U.S. Census Bureau
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
St. Clair County averages about 470 ft (145 m) above sea level across all its land. Its ground runs from 370 ft on the south side to 730 ft on the northwest side.
Average elevation
470 ft 145 m
all land inside the county
Highest
730 ft 225 m
on the northwest side
Lowest
370 ft 110 m
on the south side
St. Clair County spans about 360 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 | 470 ft145 m |
| Highest point Inside the county, on the northwest side | 730 ft225 m |
| Lowest point Inside the county, on the south side | 370 ft110 m |
Elevation profile, west to east
30 mi west to east through Belleville.
Topographic Map
- Location
- County in Illinois, United States
- Population
- 251,149 2024 est.
- Land area
- 657.7 sq mi + 16.1 sq mi water
- Density
- 382 per sq mi
- Time zone
- Central UTC−6 / −5
- Landform region
- Central Lowland
- Drains to
- Gulf of America
⤓ Download this map
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
- St. Louis County, MO550 ft
- Monroe County520 ft
- Madison County520 ft
- St. Louis city, MO490 ft
- Washington County480 ft
- St. Clair County470 ft
- Randolph County470 ft
- Clinton County450 ft
Rankings by average elevation
- Counties in Illinois85th highest of 102
- Counties in the United States2,368th highest of 3,151
Peaks and hills highest inside
- Clarks Mound677 ft
- Turkey Hill640 ft
- Winstanley Hill580 ft
- Berger Hill560 ft
- Haubers Hill550 ft
All 54 towns in St. Clair County by typical elevation
- Millstadt610 ft
- Millstadt Township600 ft
- Fairview Heights580 ft
- Swansea570 ft
- Caseyville Township560 ft
- St. Clair Township550 ft
- Shiloh550 ft
- Stookey Township550 ft
- O'Fallon550 ft
- O'Fallon Township540 ft
- Collinsville partly540 ft
- Belleville530 ft
- Floraville520 ft
- Freeburg Township510 ft
- Freeburg500 ft
- Columbia partly490 ft
- Paderborn480 ft
- Lebanon480 ft
- Lebanon Township480 ft
- Prairie Du Long Township480 ft
- Summerfield480 ft
- Smithton Township470 ft
- Smithton470 ft
- Shiloh Valley Township470 ft
- New Baden partly460 ft
- Marissa460 ft
- Marissa Township460 ft
- Rentchler450 ft
- Scott AFB440 ft
- Lenzburg440 ft
- Lenzburg Township430 ft
- Caseyville430 ft
- Mascoutah Township430 ft
- Mascoutah430 ft
- Darmstadt430 ft
- Washington Park420 ft
- New Athens Township420 ft
- New Athens420 ft
- St. Libory420 ft
- Engelmann Township420 ft
- Canteen Township420 ft
- Fairmont City420 ft
- East St. Louis420 ft
- Madison partly410 ft
- Sugar Loaf Township410 ft
- Fayetteville Township410 ft
- Fayetteville410 ft
- Dupo410 ft
- Centreville Township410 ft
- Brooklyn410 ft
- Stites Township410 ft
- Cahokia Heights410 ft
- Sauget410 ft
- East Carondelet400 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, 140 ft at 38.5421° N, 90.1612° 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.