Stephenson County, IL Elevation & Topographic Map

Topographic elevation map of Stephenson County, Illinois, shaded from 680 ft on the southwest side to 1,160 ft on the northwest side
Elevation
1,160 ft 350 m1,040 ft 315 m980 ft 300 m860 ft 260 m740 ft 225 m680 ft 210 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

Stephenson County averages about 870 ft (265 m) above sea level across all its land. Its ground runs from 680 ft on the southwest side to 1,160 ft on the northwest side.

Average elevation
870 ft 265 m
all land inside the county
Highest
1,160 ft 350 m
on the northwest side
Lowest
680 ft 210 m
on the southwest side

Stephenson County spans about 480 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 land870 ft265 m
Highest point
Inside the county, on the northwest side
1,160 ft350 m
Lowest point
Inside the county, on the southwest side
680 ft210 m

Elevation profile, west to east

27 mi west to east through Freeport.

Topographic Map

Topographic elevation map of Stephenson County, Illinois, shaded from 680 ft on the southwest side to 1,160 ft on the northwest side
County boundary (dashed) over shaded terrain, with contours every 40 ft (12 m).
Location
County in Illinois, United States
Population
43,088 2024 est.
Land area
564.2 sq mi + 0.5 sq mi water
Density
76 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. Lafayette County, WI960 ft
  2. Green County, WI930 ft
  3. Stephenson County870 ft
  4. Jo Daviess County840 ft
  5. Ogle County810 ft
  6. Winnebago County800 ft
  7. Carroll County780 ft

Rankings by average elevation

Peaks and hills highest inside

  • Bunker Hill, Stephenson County960 ft
All 31 towns in Stephenson County by typical elevation
  1. West Point Township950 ft
  2. Lena950 ft
  3. Baileyville partly940 ft
  4. Dakota Township930 ft
  5. Dakota930 ft
  6. Erin Township930 ft
  7. Jefferson Township920 ft
  8. Rock City920 ft
  9. Davis910 ft
  10. Rock Run Township900 ft
  11. Kent Township890 ft
  12. Rock Grove Township880 ft
  13. Lake Summerset870 ft
  14. Oneco Township860 ft
  15. Orangeville840 ft
  16. Loran Township840 ft
  17. Buckeye Township840 ft
  18. Pearl City840 ft
  19. Lancaster Township840 ft
  20. Silver Creek Township840 ft
  21. Cedarville840 ft
  22. Florence Township840 ft
  23. German Valley830 ft
  24. Waddams Township830 ft
  25. Ridott Township830 ft
  26. Willow Lake820 ft
  27. Harlem Township, Stephenson County820 ft
  28. Freeport820 ft
  29. Winslow Township820 ft
  30. Winslow790 ft
  31. Ridott760 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, 670 ft at 42.2746° N, 89.5790° 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.