Mercer County, IL Elevation & Topographic Map

Topographic elevation map of Mercer County, Illinois, shaded from 520 ft on the west side to 820 ft on the northeast side
Elevation
820 ft 250 m750 ft 230 m710 ft 215 m630 ft 195 m560 ft 170 m520 ft 160 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

Mercer County averages about 680 ft (210 m) above sea level across all its land. Its ground runs from 520 ft on the west side to 820 ft on the northeast side.

Average elevation
680 ft 210 m
all land inside the county
Highest
820 ft 250 m
on the northeast side
Lowest
520 ft 160 m
on the west side

Mercer County spans about 300 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 land680 ft210 m
Highest point
Inside the county, on the northeast side
820 ft250 m
Lowest point
Inside the county, on the west side
520 ft160 m

Elevation profile, west to east

33 mi west to east through Mercer Township.

Topographic Map

Topographic elevation map of Mercer County, Illinois, shaded from 520 ft on the west side to 820 ft on the northeast side
County boundary (dashed) over shaded terrain, with contours every 20 ft (6 m).
Location
County in Illinois, United States
Population
15,292 2024 est.
Land area
561.2 sq mi + 7.5 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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Sources: U.S. Census Bureau, USGS

Nearby Places

Neighboring counties sharing a border, by average

  1. Knox County720 ft
  2. Warren County720 ft
  3. Henry County710 ft
  4. Mercer County680 ft
  5. Des Moines County, IA680 ft
  6. Rock Island County670 ft
  7. Henderson County650 ft
  8. Louisa County, IA640 ft

Rankings by average elevation

All 33 towns in Mercer County by typical elevation
  1. Hamlet810 ft
  2. Preemption800 ft
  3. Reynolds partly800 ft
  4. Village of Windsor800 ft
  5. Rivoli Township800 ft
  6. Sherrard800 ft
  7. Viola780 ft
  8. Greene Township780 ft
  9. Perryton Township770 ft
  10. North Henderson770 ft
  11. Richland Grove Township760 ft
  12. North Henderson Township760 ft
  13. Preemption Township750 ft
  14. Millersburg740 ft
  15. Matherville730 ft
  16. Aledo730 ft
  17. Mercer Township730 ft
  18. Swedona720 ft
  19. Cable720 ft
  20. Duncan Township720 ft
  21. Suez Township700 ft
  22. Alexis partly700 ft
  23. Eliza690 ft
  24. Joy690 ft
  25. Millersburg Township690 ft
  26. Eliza Township680 ft
  27. Ohio Grove Township640 ft
  28. Seaton610 ft
  29. Abington Township610 ft
  30. New Boston Township570 ft
  31. New Boston570 ft
  32. Keithsburg Township550 ft
  33. Keithsburg550 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.
  • 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.