Union County, OH Elevation & Topographic Map

Topographic elevation map of Union County, Ohio, shaded from 900 ft on the southeast side to 1,140 ft on the west side
Elevation
1,140 ft 350 m1,080 ft 330 m1,050 ft 320 m990 ft 300 m930 ft 285 m900 ft 275 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

Union County averages about 1,000 ft (305 m) above sea level across all its land. Its ground runs from 900 ft on the southeast side to 1,140 ft on the west side.

Average elevation
1,000 ft 305 m
all land inside the county
Highest
1,140 ft 350 m
on the west side
Lowest
900 ft 275 m
on the southeast side

Union County spans about 240 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 land1,000 ft305 m
Highest point
Inside the county, on the west side
1,140 ft350 m
Lowest point
Inside the county, on the southeast side
900 ft275 m

Elevation profile, west to east

20 mi west to east through Paris Township.

Topographic Map

Topographic elevation map of Union County, Ohio, shaded from 900 ft on the southeast side to 1,140 ft on the west side
County boundary (dashed) over shaded terrain, with contours every 40 ft (12 m).
Location
County in Ohio, United States
Population
71,721 2024 est.
Land area
431.7 sq mi + 5.2 sq mi water
Density
166 per sq mi
Time zone
Eastern UTC−5 / −4
Landform region
Central Lowland
Drains to
Gulf of America
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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

  1. Logan County1,130 ft
  2. Champaign County1,130 ft
  3. Madison County1,010 ft
  4. Union County1,000 ft
  5. Hardin County980 ft
  6. Delaware County960 ft
  7. Marion County950 ft
  8. Franklin County850 ft

Rankings by average elevation

  • Counties in Ohio31st highest of 88
  • Counties in the United States1,401st highest of 3,151
All 23 towns in Union County by typical elevation
  1. Liberty Township, Union County1,070 ft
  2. Allen Township, Union County1,060 ft
  3. Raymond1,050 ft
  4. Washington Township, Union County1,030 ft
  5. York Township, Union County1,020 ft
  6. Taylor Township1,020 ft
  7. Paris Township1,010 ft
  8. Marysville1,010 ft
  9. Union Township, Union County990 ft
  10. Milford Center990 ft
  11. Darby Township, Union County980 ft
  12. New California980 ft
  13. Jerome Township970 ft
  14. Unionville Center970 ft
  15. Dover Township, Union County970 ft
  16. Jackson Township, Union County960 ft
  17. Millcreek Township950 ft
  18. Leesburg Township950 ft
  19. Claibourne Township940 ft
  20. Richwood940 ft
  21. Plain City partly940 ft
  22. Magnetic Springs930 ft
  23. Dublin partly910 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, 890 ft at 40.2190° N, 83.1924° 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.