St. Charles County, MO Elevation & Topographic Map

Topographic elevation map of St. Charles County, Missouri, shaded from 400 ft on the east side to 900 ft on the southwest side
Elevation
900 ft 275 m780 ft 235 m710 ft 220 m590 ft 180 m470 ft 140 m400 ft 125 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

St. Charles County averages about 540 ft (165 m) above sea level across all its land. Its ground runs from 400 ft on the east side to 900 ft on the southwest side.

Average elevation
540 ft 165 m
all land inside the county
Highest
900 ft 275 m
on the southwest side
Lowest
400 ft 125 m
on the east side

St. Charles County spans about 500 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 land540 ft165 m
Highest point
Inside the county, on the southwest side
900 ft275 m
Lowest point
Inside the county, on the east side
400 ft125 m

Elevation profile, west to east

46 mi west to east through O'Fallon.

Topographic Map

Topographic elevation map of St. Charles County, Missouri, shaded from 400 ft on the east side to 900 ft on the southwest side
County boundary (dashed) over shaded terrain, with contours every 40 ft (12 m).
Location
County in Missouri, United States
Population
423,726 2024 est.
Land area
560.3 sq mi + 32.1 sq mi water
Density
756 per sq mi
Time zone
Central UTC−6 / −5
Landform regions
Central Lowland 73%, Ozark Plateaus 27%
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. Warren County720 ft
  2. Franklin County670 ft
  3. Lincoln County610 ft
  4. Jersey County, IL580 ft
  5. Calhoun County, IL570 ft
  6. St. Louis County550 ft
  7. St. Charles County540 ft
  8. Madison County, IL520 ft

Rankings by average elevation

All 18 towns in St. Charles County by typical elevation
  1. New Melle710 ft
  2. Foristell670 ft
  3. Weldon Spring Heights610 ft
  4. Wentzville590 ft
  5. Josephville590 ft
  6. Lake St. Louis570 ft
  7. Dardenne Prairie570 ft
  8. Weldon Spring570 ft
  9. O'Fallon550 ft
  10. Flint Hill530 ft
  11. St. Charles530 ft
  12. St. Peters530 ft
  13. Augusta520 ft
  14. Defiance520 ft
  15. St. Paul520 ft
  16. Cottleville500 ft
  17. Portage Des Sioux440 ft
  18. West Alton430 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, 310 ft at 38.7532° N, 90.5138° 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.