Union, LA Elevation & Topographic Map

Topographic elevation map of Union, Louisiana, shaded from 1 ft on the northeast side to 56 ft on the east side
Elevation
56 ft 17 m42 ft 13 m35 ft 11 m22 ft 7 m8 ft 2 m1 ft 0 m
Contours every 100 ft, bold every 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.
Area
Fades everything outside the official CDP boundary (US Census).

Elevation Data

Union sits at about 18 ft (5 m) above sea level, worked out from 2020 Census block heights on USGS 3DEP, weighted by residents.

Typical elevation
18 ft 5 m
most residents: 14–19 ft
Lowest
1 ft 0 m
on the northeast side
Highest
56 ft 17 m
on the east side
Average
12 ft 4 m
all land inside the CDP boundary

Union spans about 55 ft of height, so no single spot tells the whole story. The ruler shows where its people live, and where the other numbers you'll see come from.

Under 1% of Union's land lies below the average daily high tide (MHHW, NOAA), and 8% lies less than 3 ft above it. Check flood zones on FEMA's map

FigureElevation
Typical
Where people live: half of residents higher, half lower
18 ft5 m
Highest point
Inside the CDP boundary, on the east side
56 ft17 m
Lowest point
Inside the CDP boundary, on the northeast side
1 ft0 m
Town center
USGS map point for Union
21 ft6 m
Airport (REG)
FAA airport elevation, the highest point of its runways, 4.3 mi north of the CDP boundary
14 ft4 m
Average of all land12 ft4 m

Topographic Map

Topographic elevation map of Union, Louisiana, shaded from 1 ft on the northeast side to 56 ft on the east side
CDP boundary (dashed) over shaded terrain, with contours every 10 ft (3 m).
Location
Unincorporated community (census-designated place) in St. James Parish, Louisiana, United States
Population
735 2020 Census
Land area
9.5 sq mi + 1.1 sq mi water
Density
77 per sq mi
Coordinates
30.0871° N, 90.9048° W
Time zone
Central UTC−6 / −5
Landform region
Coastal Plain
Drains to
Gulf of America
Airport
Louisiana Regional (REG) 14 ft
ZIP codes 1
70723
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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, FAA

Nearby Places

Nearby towns by typical elevation

  1. Darrow19 ft
  2. Donaldsonville19 ft
  3. Union18 ft
  4. Convent15 ft
  5. Lemannville14 ft
  6. Belle Rose14 ft
  7. St. James10 ft
  8. Welcome7 ft
  9. Romeville5 ft
  10. Hester5 ft
  11. Sorrento4 ft

Rankings by typical elevation

Peaks and hills nearest, by height

  • Indian Mound, Livingston Parish14 ft
How we measure
  • Typical elevation: the population-weighted median: every 2020 Census block inside the CDP boundary, at its USGS 3DEP height, weighted by the people who live there. Half of residents live higher, half lower.
  • Lowest, highest, average: USGS 3DEP bare-earth heights on a 1 arc-second (≈100 ft, 30 m) grid, land only, inside the Census CDP boundary (TIGER, Jan 1 2026).
  • Nearby Places: nearby towns and rankings use each town's typical elevation, so every town is compared like for like. Rankings count every city, town, township and census-designated place, including places inside a town. Peaks and hills: the nearest summits with at least 980 ft (300 m) of prominence within 62 mi (100 km), then federal (GNIS) summits within 16 mi (25 km) 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).
  • 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 (FAA airport elevation, 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.
  • Union is an unincorporated community; figures cover the census-designated place, a statistical area.
  • Sources: USGS 3DEP, GNIS, Watershed Boundary Dataset and physiographic provinces; U.S. Census Bureau (boundaries, 2020 blocks, Gazetteer areas, ZIP code areas); FAA airport data; BTS time zones; NOAA tidal surfaces (MHHW). All public domain.