Monroe County, IL Elevation & Topographic Map
Elevation
830 ft 255 m710 ft 215 m650 ft 200 m540 ft 165 m420 ft 130 m360 ft 110 m
Contours every 500 ft, bold every 2,500 ft
USGS 3DEP · U.S. Census Bureau
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
Monroe County averages about 520 ft (160 m) above sea level across all its land. Its ground runs from 360 ft on the south side to 830 ft on the west side.
Average elevation
520 ft 160 m
all land inside the county
Highest
830 ft 255 m
on the west side
Lowest
360 ft 110 m
on the south side
Monroe County spans about 470 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.
| Figure | Elevation |
|---|---|
| Average of all land | 520 ft160 m |
| Highest point Inside the county, on the west side | 830 ft255 m |
| Lowest point Inside the county, on the south side | 360 ft110 m |
Elevation profile, west to east
17 mi west to east through Waterloo.
Topographic Map
- Location
- County in Illinois, United States
- Population
- 34,969 2024 est.
- Land area
- 385.3 sq mi + 13.0 sq mi water
- Density
- 91 per sq mi
- Time zone
- Central UTC−6 / −5
- Landform region
- Central Lowland 99%
- Drains to
- Gulf of America
⤓ Download this map
WebP, 1200 × 900. Free to use: credit “ElevationOf.com” with a link to this page.
Sources: U.S. Census Bureau, USGS
Nearby Places
Neighboring counties sharing a border, by average
- Ste. Genevieve County, MO690 ft
- Jefferson County, MO630 ft
- St. Louis County, MO550 ft
- Monroe County520 ft
- St. Clair County470 ft
- Randolph County470 ft
Rankings by average elevation
- Counties in Illinois73rd highest of 102
- Counties in the United States2,301st highest of 3,151
Peaks and hills highest inside
- Potato Hill, Monroe County710 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.