Map of Union City, California, United States

Union City is a city in California, United States, with a population of about 74,494. It lies at 37.5958°N, 122.0191°W, about 21 m above sea level. Union City is about 3,891 km (2,418 mi) west of Washington, D.C., the capital. The nearest city on our map is Fremont, 6 km to the southeast.

Union City at a glance

Where is Union City?

• Located in the Northern and Western hemispheres.
• Daylight ranges from about 9 h 34 min on the shortest day to 14 h 46 min on the longest day (around 21 December and 21 June).

Cities near Union City

• Fremont — 6 km southeast
• Newark — 8 km south
• Hayward — 10 km northwest
• Castro Valley — 12 km northwest
• Dublin — 14 km northeast
• Pleasanton — 15 km northeast
• San Leandro — 19 km northwest
• Palo Alto — 20 km southwest
• San Ramon — 21 km north
• Milpitas — 21 km southeast

Largest cities in California

• Los Angeles — 3,820,914
• San Diego — 1,404,452
• San Jose — 997,368
• San Francisco — 827,526
• Fresno — 542,107
• Sacramento — 524,943
• Long Beach — 474,140
• Oakland — 419,267
• Bakersfield — 373,640
• Anaheim — 350,742

Largest cities in United States

• New York City — 8,804,190
• Los Angeles — 3,820,914
• Brooklyn — 2,736,074
• Chicago — 2,664,452
• Queens — 2,316,841
• Houston — 2,314,157
• Phoenix — 1,650,070
• Philadelphia — 1,573,916
• San Antonio — 1,526,656
• Manhattan — 1,487,536

Map of United States and all its cities →

Other places named Union City

• Union City — New Jersey, United States

Sources: place names, coordinates, populations and time zones from GeoNames (CC BY 4.0, data retrieved October 2026). Population figures are the latest values recorded in GeoNames; depending on the country they refer to the city proper, a municipality or a wider urban area, so they can differ from census or metro-area figures. Map © OpenStreetMap contributors.