Ogle County, IL Elevation & Topographic Map

Topographic elevation map of Ogle County, Illinois, shaded from 650 ft on the southwest side to 1,020 ft on the northwest side
Elevation
1,020 ft 310 m930 ft 285 m880 ft 270 m790 ft 240 m690 ft 210 m650 ft 200 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

Ogle County averages about 810 ft (250 m) above sea level across all its land. Its ground runs from 650 ft on the southwest side to 1,020 ft on the northwest side.

Average elevation
810 ft 250 m
all land inside the county
Highest
1,020 ft 310 m
on the northwest side
Lowest
650 ft 200 m
on the southwest side

Ogle County spans about 370 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 land810 ft250 m
Highest point
Inside the county, on the northwest side
1,020 ft310 m
Lowest point
Inside the county, on the southwest side
650 ft200 m

Elevation profile, west to east

25 mi west to east through Flagg Township.

Topographic Map

Topographic elevation map of Ogle County, Illinois, shaded from 650 ft on the southwest side to 1,020 ft on the northwest side
County boundary (dashed) over shaded terrain, with contours every 20 ft (6 m).
Location
County in Illinois, United States
Population
51,345 2024 est.
Land area
758.7 sq mi + 4.8 sq mi water
Density
68 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. Stephenson County870 ft
  2. DeKalb County830 ft
  3. Ogle County810 ft
  4. Winnebago County800 ft
  5. Lee County790 ft
  6. Carroll County780 ft
  7. Whiteside County660 ft

Rankings by average elevation

Peaks and hills highest inside

  • Coffman Bluff950 ft
All 43 towns in Ogle County by typical elevation
  1. Forreston940 ft
  2. Forreston Township940 ft
  3. Baileyville940 ft
  4. Mount Morris910 ft
  5. Mount Morris Township910 ft
  6. Creston910 ft
  7. Dement Township900 ft
  8. Lincoln Township890 ft
  9. Kings890 ft
  10. Eagle Point Township860 ft
  11. Polo860 ft
  12. Buffalo Township860 ft
  13. Monroe Center850 ft
  14. White Rock Township850 ft
  15. Holcomb840 ft
  16. Woosung Township820 ft
  17. Brookville Township820 ft
  18. Maryland Township820 ft
  19. Pine Creek Township810 ft
  20. Hillcrest810 ft
  21. Adeline800 ft
  22. Scott Township800 ft
  23. Davis Junction800 ft
  24. Monroe Township800 ft
  25. Flagg Township800 ft
  26. Rochelle800 ft
  27. Lafayette Township, Ogle County790 ft
  28. Rockford partly790 ft
  29. Lynnville Township770 ft
  30. Rockvale Township770 ft
  31. Pine Rock Township760 ft
  32. Leaf River Township760 ft
  33. Marion Township740 ft
  34. Taylor Township730 ft
  35. Stillman Valley730 ft
  36. Byron Township720 ft
  37. Lost Nation720 ft
  38. Byron720 ft
  39. Leaf River720 ft
  40. Oregon-Nashua Township700 ft
  41. Oregon700 ft
  42. Grand Detour Township690 ft
  43. Grand Detour680 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, 640 ft at 41.9829° N, 89.3882° 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.