Rock Island County, IL Elevation & Topographic Map

Topographic elevation map of Rock Island County, Illinois, shaded from 480 ft on the southeast side to 830 ft on the south side
Elevation
830 ft 250 m740 ft 225 m690 ft 210 m610 ft 185 m520 ft 160 m480 ft 145 m
Contours every 500 ft, bold every 2,500 ft
USGS 3DEP · U.S. Census Bureau
⤓ Download this map
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

Rock Island County averages about 670 ft (205 m) above sea level across all its land. Its ground runs from 480 ft on the southeast side to 830 ft on the south side.

Average elevation
670 ft 205 m
all land inside the county
Highest
830 ft 250 m
on the south side
Lowest
480 ft 145 m
on the southeast side

Rock Island County spans about 350 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 land670 ft205 m
Highest point
Inside the county, on the south side
830 ft250 m
Lowest point
Inside the county, on the southeast side
480 ft145 m

Elevation profile, south to north

13 mi south to north through Moline.

Topographic Map

Topographic elevation map of Rock Island County, Illinois, shaded from 480 ft on the southeast side to 830 ft on the south side
County boundary (dashed) over shaded terrain, with contours every 40 ft (12 m).
Location
County in Illinois, United States
Population
142,731 2024 est.
Land area
427.5 sq mi + 23.8 sq mi water
Density
334 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

  1. Clinton County, IA720 ft
  2. Scott County, IA710 ft
  3. Henry County710 ft
  4. Mercer County680 ft
  5. Muscatine County, IA670 ft
  6. Rock Island County670 ft
  7. Whiteside County660 ft
  8. Louisa County, IA640 ft

Rankings by average elevation

Peaks and hills highest inside

  • Army Ridge Bluffs740 ft
All 42 towns in Rock Island County by typical elevation
  1. Reynolds800 ft
  2. Edgington780 ft
  3. Edgington Township780 ft
  4. Taylor Ridge770 ft
  5. Illinois City760 ft
  6. Buffalo Prairie760 ft
  7. Coyne Center740 ft
  8. Bowling Township740 ft
  9. Rural Township730 ft
  10. Oak Grove730 ft
  11. Buffalo Prairie Township720 ft
  12. Rapids City700 ft
  13. Coe Township690 ft
  14. Coal Valley690 ft
  15. Moline Township690 ft
  16. Drury Township680 ft
  17. Silvis680 ft
  18. Moline680 ft
  19. South Moline Township680 ft
  20. Coal Valley Township680 ft
  21. East Moline670 ft
  22. South Rock Island Township670 ft
  23. Hampton Township670 ft
  24. Port Byron670 ft
  25. Hampton670 ft
  26. Rock Island670 ft
  27. Blackhawk Township640 ft
  28. Carbon Cliff640 ft
  29. Milan640 ft
  30. Zuma Township630 ft
  31. Port Byron Township620 ft
  32. Cordova Township600 ft
  33. Rock Island Township590 ft
  34. Cordova590 ft
  35. Andalusia Township580 ft
  36. Canoe Creek Township580 ft
  37. Hillsdale580 ft
  38. Rock Island Arsenal580 ft
  39. Joslin580 ft
  40. Barstow570 ft
  41. Campbell's Island570 ft
  42. Andalusia570 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 41.4604° N, 90.5651° 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.