Union City, CA Elevation & Topographic Map
Elevation
1,840 ft 560 m1,380 ft 420 m1,150 ft 350 m690 ft 210 m230 ft 70 m2 ft 1 m
Contours every 100 ft, bold every 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.
- City area
- Fades everything outside the official city limits (US Census).
Elevation Data
Union City sits at about 19 ft (6 m) above sea level, worked out from 2020 Census block heights on USGS 3DEP, weighted by residents.
Typical elevation
19 ft 6 m
most residents: 10–75 ft
Lowest
2 ft 1 m
on the west side
Highest
1,840 ft 560 m
on the northeast side
Average
480 ft 145 m
all land inside city limits
Union City spans about 1,838 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.
| Figure | Elevation |
|---|---|
| Typical Where people live: half of residents higher, half lower | 19 ft6 m |
| Highest point Inside city limits, on the northeast side | 1,840 ft560 m |
| Lowest point Inside city limits, on the west side | 2 ft1 m |
| Town center USGS map point for Union City | 67 ft20 m |
| Airport (OAK) FAA airport elevation, the highest point of its runways, 11 mi northwest of the city limits | 9 ft3 m |
| Average of all land | 480 ft145 m |
Elevation profile, west to east
7.6 mi west to east through the town center.
Topographic Map
- Location
- City in Alameda County, California, United States
- Population
- 66,196 2024 est.
- Land area
- 19.4 sq mi
- Density
- 3,413 per sq mi
- Coordinates
- 37.5958° N, 122.0192° W
- Time zone
- Pacific UTC−8 / −7
- Landform region
- Pacific Border
- Drains to
- Pacific Ocean
- Airport
- Oakland San Francisco Bay (OAK) 9 ft
- ZIP codes 2
- 94552 94587
⤓ Download this map
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Sources: U.S. Census Bureau, USGS, FAA
Nearby Places
Nearby towns by typical elevation
- Sunol600 ft
- Dublin380 ft
- Fairview370 ft
- Castro Valley270 ft
- Cherryland67 ft
- Fremont52 ft
- Hayward52 ft
- Ashland43 ft
- San Lorenzo31 ft
- Newark23 ft
- Union City19 ft
Rankings by typical elevation
- Towns in California1,562nd highest of 1,622
- Towns in Alameda County18th highest of 20
Peaks and hills nearest, by height
- Mount Diablo3,864 ft
- Discovery Peak3,830 ft
- Mount Allison2,664 ft
- Sunol Peak2,191 ft
- Rocky Ridge2,020 ft
How we measure
- Typical elevation: the population-weighted median: every 2020 Census block inside the city limits, 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 city limits (TIGER, Jan 1 2026).
- 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, 1 ft at 37.5838° N, 122.0893° W, is in such a hollow or patch and is not counted.
- 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.
- Sources: USGS 3DEP, GNIS, Watershed Boundary Dataset and physiographic provinces; U.S. Census Bureau (boundaries, 2020 blocks, 2024 population estimates, Gazetteer areas, ZIP code areas); FAA airport data; BTS time zones; NOAA NGS survey heights. All public domain.