Franklin County, IL Elevation & Topographic Map

Topographic elevation map of Franklin County, Illinois, shaded from 360 ft on the southwest side to 610 ft on the east side
Elevation
600 ft 185 m540 ft 165 m510 ft 155 m450 ft 135 m390 ft 120 m360 ft 110 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

Franklin County averages about 440 ft (135 m) above sea level across all its land. Its ground runs from 360 ft on the southwest side to 610 ft on the east side.

Average elevation
440 ft 135 m
all land inside the county
Highest
610 ft 185 m
on the east side
Lowest
360 ft 110 m
on the southwest side

Franklin County spans about 250 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 land440 ft135 m
Highest point
Inside the county, on the east side
610 ft185 m
Lowest point
Inside the county, on the southwest side
360 ft110 m

Elevation profile, west to east

24 mi west to east through Benton Township, Franklin County.

Topographic Map

Topographic elevation map of Franklin County, Illinois, shaded from 360 ft on the southwest side to 610 ft on the east side
County boundary (dashed) over shaded terrain, with contours every 20 ft (6 m).
Location
County in Illinois, United States
Population
37,033 2024 est.
Land area
408.9 sq mi + 22.5 sq mi water
Density
91 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. Jefferson County490 ft
  2. Williamson County470 ft
  3. Perry County460 ft
  4. Jackson County460 ft
  5. Hamilton County440 ft
  6. Franklin County440 ft
  7. Saline County420 ft

Rankings by average elevation

Peaks and hills highest inside

  • Grammer Hill570 ft
  • Moores Hill540 ft
  • Webbs Hill500 ft
  • Turkey Knob490 ft
  • Browning Hill450 ft
All 29 towns in Franklin County by typical elevation
  1. Macedonia partly500 ft
  2. Thompsonville490 ft
  3. Cave Township480 ft
  4. Ewing470 ft
  5. Hanaford470 ft
  6. Sesser470 ft
  7. Goode Township470 ft
  8. Eastern Township470 ft
  9. Northern Township460 ft
  10. North City460 ft
  11. Barren Township450 ft
  12. Ewing Township450 ft
  13. Benton450 ft
  14. Benton Township, Franklin County450 ft
  15. West City450 ft
  16. Mulkeytown440 ft
  17. Tyrone Township440 ft
  18. Christopher440 ft
  19. Browning Township430 ft
  20. Valier430 ft
  21. Orient420 ft
  22. Zeigler410 ft
  23. Frankfort Township, Franklin County410 ft
  24. Six Mile Township400 ft
  25. Buckner400 ft
  26. West Frankfort400 ft
  27. Denning Township400 ft
  28. Royalton390 ft
  29. Freeman Spur partly390 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.