Jefferson County, IL Elevation & Topographic Map

Topographic elevation map of Jefferson County, Illinois, shaded from 410 ft on the south side to 640 ft on the north side
Elevation
640 ft 195 m580 ft 180 m550 ft 170 m500 ft 150 m440 ft 135 m410 ft 125 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

Jefferson County averages about 490 ft (150 m) above sea level across all its land. Its ground runs from 410 ft on the south side to 640 ft on the north side.

Average elevation
490 ft 150 m
all land inside the county
Highest
640 ft 195 m
on the north side
Lowest
410 ft 125 m
on the south side

Jefferson County spans about 230 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 land490 ft150 m
Highest point
Inside the county, on the north side
640 ft195 m
Lowest point
Inside the county, on the south side
410 ft125 m

Elevation profile, west to east

24 mi west to east through Mount Vernon.

Topographic Map

Topographic elevation map of Jefferson County, Illinois, shaded from 410 ft on the south side to 640 ft on the north side
County boundary (dashed) over shaded terrain, with contours every 20 ft (6 m).
Location
County in Illinois, United States
Population
36,107 2024 est.
Land area
571.2 sq mi + 12.6 sq mi water
Density
63 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. Marion County530 ft
  2. Jefferson County490 ft
  3. Washington County480 ft
  4. Perry County460 ft
  5. Hamilton County440 ft
  6. Franklin County440 ft
  7. Wayne County440 ft

Rankings by average elevation

Peaks and hills highest inside

  • Lowry Hill590 ft
  • The Pinnacle520 ft
All 26 towns in Jefferson County by typical elevation
  1. Dix590 ft
  2. Field Township560 ft
  3. Rome Township550 ft
  4. Grand Prairie Township540 ft
  5. Shiloh Township520 ft
  6. Bluford520 ft
  7. Webber Township510 ft
  8. Opdyke510 ft
  9. Casner Township510 ft
  10. Mount Vernon500 ft
  11. Farrington Township490 ft
  12. Woodlawn490 ft
  13. Mount Vernon Township490 ft
  14. Pendleton Township490 ft
  15. Moores Prairie Township490 ft
  16. Blissville Township490 ft
  17. Bald Hill Township480 ft
  18. Belle Rive470 ft
  19. Dodds Township470 ft
  20. Waltonville460 ft
  21. McClellan Township460 ft
  22. Elk Prairie Township440 ft
  23. Nason430 ft
  24. Bonnie430 ft
  25. Ina420 ft
  26. Spring Garden Township420 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.