Duncan Township, IL Elevation & Topographic Map

Topographic elevation map of Duncan Township, Illinois, shaded from 590 ft on the south side to 790 ft on the east side
Elevation
790 ft 240 m740 ft 225 m720 ft 220 m670 ft 205 m620 ft 190 m590 ft 180 m
Contours every 200 ft, bold every 1,000 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.
Township area
Fades everything outside the official township boundaries (US Census).

Elevation Data

Duncan Township sits at about 720 ft (220 m) above sea level, worked out from 2020 Census block heights on USGS 3DEP, weighted by residents.

Typical elevation
720 ft 220 m
most residents: 680–780 ft
Lowest
590 ft 180 m
on the south side
Highest
790 ft 240 m
on the east side
Average
720 ft 220 m
all land inside township boundaries

Duncan Township spans about 200 ft of height, so no single spot tells the whole story. The ruler shows where its people live, and where the other numbers you'll see come from.

FigureElevation
Typical
Where people live: half of residents higher, half lower
720 ft220 m
Highest point
Inside township boundaries, on the east side
790 ft240 m
Lowest point
Inside township boundaries, on the south side
590 ft180 m
Average of all land720 ft220 m

Elevation profile, south to north

6.1 mi south to north through the middle of Duncan Township.

Topographic Map

Topographic elevation map of Duncan Township, Illinois, shaded from 590 ft on the south side to 790 ft on the east side
Township boundaries (dashed) over shaded terrain, with contours every 10 ft (3 m).
Location
Township in Mercer County, Illinois, United States
Population
257 2024 est.
Land area
36.6 sq mi
Density
7.0 per sq mi
Coordinates
41.2990° N, 90.8495° W
Time zone
Central UTC−6 / −5
Landform region
Central Lowland
Drains to
Mississippi River → Gulf of America
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Sources: U.S. Census Bureau, USGS

Nearby Places

Nearby towns by typical elevation

  1. Hamlet810 ft
  2. Perryton Township770 ft
  3. Illinois City760 ft
  4. Buffalo Prairie760 ft
  5. Millersburg740 ft
  6. Buffalo Prairie Township720 ft
  7. Duncan Township720 ft
  8. Eliza690 ft
  9. Joy690 ft
  10. Millersburg Township690 ft
  11. Eliza Township680 ft

Rankings by typical elevation

Peaks and hills nearest, by height

  • Army Ridge Bluffs740 ft
How we measure
  • Typical elevation: the population-weighted median: every 2020 Census block inside the township boundaries, at its USGS 3DEP height, weighted by the people who live there. Half of residents live higher, half lower.
  • Lowest, highest, average: USGS 3DEP bare-earth heights on a 1 arc-second (≈100 ft, 30 m) grid, land only, inside the Census township boundaries (TIGER, Jan 1 2026).
  • Nearby Places: nearby towns and rankings use each town's typical elevation, so every town is compared like for like. Rankings count every city, town, township and census-designated place, including places inside a town. Peaks and hills: the nearest summits with at least 980 ft (300 m) of prominence within 62 mi (100 km), then federal (GNIS) summits within 16 mi (25 km) 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).
  • 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 (FAA airport elevation, 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 (boundaries, 2020 blocks, 2024 population estimates, Gazetteer areas); BTS time zones. All public domain.