Jersey County, IL Elevation & Topographic Map
Elevation
890 ft 270 m770 ft 235 m710 ft 215 m590 ft 180 m470 ft 145 m410 ft 125 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
Jersey County averages about 580 ft (175 m) above sea level across all its land. Its ground runs from 410 ft on the west side to 890 ft on Tucker Knob.
Average elevation
580 ft 175 m
all land inside the county
Highest
890 ft 270 m
on Tucker Knob
Lowest
410 ft 125 m
on the west side
Jersey County spans about 480 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 | 580 ft175 m |
| Highest point Inside the county, on Tucker Knob | 890 ft270 m |
| Lowest point Inside the county, on the west side | 410 ft125 m |
Elevation profile, south to north
17 mi south to north through Jersey Township.
Topographic Map
- Location
- County in Illinois, United States
- Population
- 21,150 2024 est.
- Land area
- 369.6 sq mi + 7.9 sq mi water
- Density
- 57 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
- Macoupin County630 ft
- Jersey County580 ft
- Calhoun County570 ft
- Greene County540 ft
- St. Charles County, MO540 ft
- Madison County520 ft
Rankings by average elevation
- Counties in Illinois62nd highest of 102
- Counties in the United States2,234th highest of 3,151
Peaks and hills highest inside
- Tucker Knob890 ft
- McAdams Peak850 ft
- McCoy Hill800 ft
- Dug Hill740 ft
All 19 towns in Jersey County by typical elevation
- Fieldon690 ft
- Grafton680 ft
- Quarry Township670 ft
- Brighton partly660 ft
- Richwood Township640 ft
- Jerseyville640 ft
- Jersey Township630 ft
- Fidelity630 ft
- Mississippi Township620 ft
- Otterville620 ft
- Piasa Township620 ft
- Otter Creek Township, Jersey County610 ft
- Elsah610 ft
- Elsah Township610 ft
- Medora partly610 ft
- English Township600 ft
- Fidelity Township590 ft
- Ruyle Township540 ft
- Rosedale Township540 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.
- Highest ground: the single highest 3DEP cell, 890 ft at 38.9937° N, 90.4785° W, has no federal (GNIS) summit name within 980 ft (300 m), so the high point shown is the highest of the 25 highest cells with a GNIS summit within 1,640 ft (500 m).
- 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.