Union County, PA Elevation & Topographic Map

Topographic elevation map of Union County, Pennsylvania, shaded from 420 ft on the southeast side to 2,170 ft on Paddy Mountain
Elevation
2,170 ft 660 m1,730 ft 530 m1,510 ft 460 m1,080 ft 330 m640 ft 195 m420 ft 130 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 950 ft (290 m) above sea level across all its land. Its ground runs from 420 ft on the southeast side to 2,170 ft on Paddy Mountain.

Average elevation
950 ft 290 m
all land inside the county
Highest
2,170 ft 660 m
on Paddy Mountain
Lowest
420 ft 130 m
on the southeast side

Union County spans about 1,750 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 land950 ft290 m
Highest point
Inside the county, on Paddy Mountain
2,170 ft660 m
Lowest point
Inside the county, on the southeast side
420 ft130 m

Elevation profile, west to east

19 mi west to east through East Buffalo Township.

Topographic Map

Topographic elevation map of Union County, Pennsylvania, shaded from 420 ft on the southeast side to 2,170 ft on Paddy Mountain
County boundary (dashed) over shaded terrain, with contours every 100 ft (30 m).
Location
County in Pennsylvania, United States
Population
42,159 2024 est.
Land area
316.0 sq mi + 1.8 sq mi water
Density
133 per sq mi
Time zone
Eastern UTC−5 / −4
Landform region
Valley and Ridge
Drains to
Atlantic Ocean
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Sources: U.S. Census Bureau, USGS

Nearby Places

Neighboring counties sharing a border, by average

  1. Centre County1,490 ft
  2. Clinton County1,460 ft
  3. Lycoming County1,310 ft
  4. Mifflin County1,060 ft
  5. Union County950 ft
  6. Snyder County840 ft
  7. Northumberland County790 ft

Rankings by average elevation

Peaks and hills highest inside

  • Paddy Mountain2,170 ft
  • Jones Mountain2,170 ft
  • Branch Mountain2,140 ft
  • Naked Mountain2,120 ft
  • Buffalo Mountain, Union County2,070 ft
All 21 towns in Union County by typical elevation
  1. Hartley Township700 ft
  2. Lewis Township, Union County690 ft
  3. Laurelton680 ft
  4. Union Township, Union County670 ft
  5. Hartleton670 ft
  6. Limestone Township, Union County660 ft
  7. Winfield640 ft
  8. West Buffalo Township640 ft
  9. White Deer Township610 ft
  10. Gregg Township610 ft
  11. Mifflinburg570 ft
  12. Buffalo Township, Union County560 ft
  13. Vicksburg540 ft
  14. New Berlin540 ft
  15. West Milton540 ft
  16. Kelly Township530 ft
  17. East Buffalo Township520 ft
  18. New Columbia510 ft
  19. Allenwood490 ft
  20. Linntown490 ft
  21. Lewisburg460 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, 2,170 ft at 40.9301° N, 77.2610° 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.