Alton, IL Elevation & Topographic Map
Elevation
650 ft 200 m580 ft 175 m540 ft 165 m470 ft 140 m390 ft 120 m350 ft 110 m
Contours every 100 ft, bold every 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.
- City area
- Fades everything outside the official city limits (US Census).
Elevation Data
Alton sits at about 530 ft (160 m) above sea level, worked out from 2020 Census block heights on USGS 3DEP, weighted by residents.
Typical elevation
530 ft 160 m
most residents: 470–610 ft
Lowest
360 ft 110 m
on the east side
Highest
650 ft 200 m
on the north side
Average
510 ft 155 m
all land inside city limits
Alton spans about 290 ft of height, so no single spot tells the whole story. The ruler shows where its people live, and where the other numbers you'll see come from.
| Figure | Elevation |
|---|---|
| Typical Where people live: half of residents higher, half lower | 530 ft160 m |
| Highest point Inside city limits, on the north side | 650 ft200 m |
| Lowest point Inside city limits, on the east side | 360 ft110 m |
| Town center USGS map point for Alton | 490 ft150 m |
| Airport (STL) FAA airport elevation, the highest point of its runways, 13 mi southwest of the city limits | 617 ft188 m |
| Average of all land | 510 ft155 m |
Elevation profile, south to north
3.4 mi south to north through the town center.
Topographic Map
- Location
- City in Madison County, Illinois, United States
- Population
- 24,967 2024 est.
- Land area
- 15.6 sq mi + 1.3 sq mi water
- Density
- 1,598 per sq mi
- Coordinates
- 38.8906° N, 90.1843° W
- Time zone
- Central UTC−6 / −5
- Landform region
- Central Lowland
- Drains to
- Mississippi River → Gulf of America
- Airport
- St Louis Lambert International (STL) 617 ft
- ZIP codes 2
- 62002 62018
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Sources: U.S. Census Bureau, USGS, FAA
Nearby Places
Nearby towns by typical elevation
- Godfrey590 ft
- Foster Township530 ft
- Rosewood Heights530 ft
- Alton530 ft
- Old Jamestown, MO520 ft
- Wood River Township450 ft
- Roxana440 ft
- Wood River440 ft
- East Alton440 ft
- Hartford430 ft
- West Alton, MO430 ft
Rankings by typical elevation
- Towns in Illinois2,338th highest of 2,872
- Towns in Madison County31st highest of 54
Peaks and hills nearest, by height
- Fox Hill600 ft
- Monks Mound520 ft
How we measure
- Typical elevation: the population-weighted median: every 2020 Census block inside the city limits, at its USGS 3DEP height, weighted by the people who live there. Half of residents live higher, half lower.
- Lowest, highest, average: USGS 3DEP bare-earth heights on a 1 arc-second (≈100 ft, 30 m) grid, land only, inside the Census city limits (TIGER, Jan 1 2026).
- 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, 300 ft at 38.9046° N, 90.1804° W, is in such a hollow or patch and is not counted.
- Nearby Places: nearby towns and rankings use each town's typical elevation, so every town is compared like for like. Rankings count every city, town, township and census-designated place, including places inside a town. Peaks and hills: the nearest summits with at least 980 ft (300 m) of prominence within 62 mi (100 km), then federal (GNIS) summits within 16 mi (25 km) 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).
- 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 (FAA airport elevation, 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 (boundaries, 2020 blocks, 2024 population estimates, Gazetteer areas, ZIP code areas); FAA airport data; BTS time zones. All public domain.