Rock County, WI Elevation & Topographic Map

Topographic elevation map of Rock County, Wisconsin, shaded from 740 ft on the southwest side to 1,080 ft on the west side
Elevation
1,080 ft 330 m1,000 ft 305 m950 ft 290 m870 ft 265 m780 ft 240 m740 ft 225 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

Rock County averages about 880 ft (270 m) above sea level across all its land. Its ground runs from 740 ft on the southwest side to 1,080 ft on the west side.

Average elevation
880 ft 270 m
all land inside the county
Highest
1,080 ft 330 m
on the west side
Lowest
740 ft 225 m
on the southwest side

Rock County spans about 340 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 land880 ft270 m
Highest point
Inside the county, on the west side
1,080 ft330 m
Lowest point
Inside the county, on the southwest side
740 ft225 m

Elevation profile, west to east

30 mi west to east through Janesville.

Topographic Map

Topographic elevation map of Rock County, Wisconsin, shaded from 740 ft on the southwest side to 1,080 ft on the west side
County boundary (dashed) over shaded terrain, with contours every 20 ft (6 m).
Location
County in Wisconsin, United States
Population
165,461 2024 est.
Land area
718.2 sq mi + 8.0 sq mi water
Density
230 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. Dane County950 ft
  2. Green County930 ft
  3. Walworth County920 ft
  4. Rock County880 ft
  5. Boone County, IL860 ft
  6. Jefferson County840 ft
  7. Winnebago County, IL800 ft

Rankings by average elevation

Peaks and hills highest inside

  • Mount Zion1,050 ft
All 32 towns in Rock County by typical elevation
  1. Clinton970 ft
  2. Union, Rock County950 ft
  3. Town of Clinton950 ft
  4. Johnstown950 ft
  5. Harmony920 ft
  6. Magnolia920 ft
  7. Evansville920 ft
  8. Bradford920 ft
  9. Center, Rock County900 ft
  10. Orfordville900 ft
  11. Porter900 ft
  12. Lima, Rock County890 ft
  13. Town of Spring Valley890 ft
  14. Town of Janesville890 ft
  15. Milton880 ft
  16. Shopiere870 ft
  17. Janesville860 ft
  18. Town of Plymouth850 ft
  19. Fulton850 ft
  20. La Prairie850 ft
  21. Town of Milton850 ft
  22. Edgerton840 ft
  23. Newark840 ft
  24. Footville830 ft
  25. Turtle820 ft
  26. Fulton, Rock County800 ft
  27. Hanover800 ft
  28. Avon800 ft
  29. Town of Beloit790 ft
  30. Brodhead partly790 ft
  31. Beloit790 ft
  32. Rock780 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.