Johnson County, IA Elevation & Topographic Map
Elevation
910 ft 275 m820 ft 250 m780 ft 240 m700 ft 210 m610 ft 185 m570 ft 175 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
Johnson County averages about 740 ft (225 m) above sea level across all its land. Its ground runs from 570 ft on the northeast side to 910 ft on the northwest side.
Average elevation
740 ft 225 m
all land inside the county
Highest
910 ft 275 m
on the northwest side
Lowest
570 ft 175 m
on the northeast side
Johnson County spans about 340 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 | 740 ft225 m |
| Highest point Inside the county, on the northwest side | 910 ft275 m |
| Lowest point Inside the county, on the northeast side | 570 ft175 m |
Elevation profile, south to north
24 mi south to north through Iowa City.
Topographic Map
- Location
- County in Iowa, United States
- Population
- 160,080 2024 est.
- Land area
- 613.0 sq mi + 10.1 sq mi water
- Density
- 261 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
- Linn County850 ft
- Iowa County820 ft
- Cedar County780 ft
- Johnson County740 ft
- Washington County730 ft
- Muscatine County670 ft
- Louisa County640 ft
Rankings by average elevation
- Counties in Iowa89th highest of 99
- Counties in the United States1,938th highest of 3,151
Peaks and hills highest inside
- Sand Hill820 ft
All 13 towns in Johnson County by typical elevation
- Shueyville830 ft
- Frytown790 ft
- Swisher790 ft
- Solon790 ft
- North Liberty780 ft
- Oxford760 ft
- University Heights760 ft
- Tiffin760 ft
- West Branch partly740 ft
- Coralville740 ft
- Lone Tree720 ft
- Iowa City710 ft
- Hills630 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.
- Pits: the lowest point is the lowest ground outside closed hollows (quarry floors, mine pits, terrain-model artifacts): any hollow under 0.4 sq mi (1 km²), and any hollow under 2 sq mi (5 km²) whose floor is more than 100 ft (30 m) below its rim; and outside patches below sea level of under 0.4 sq mi (1 km²). The single lowest 3DEP cell, 530 ft at 41.6957° N, 91.5607° W, is in such a hollow or patch and is not counted.
- 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.