City
Union City
Union City is a city record. City or town offices may handle local rules inside their limits, while county offices still handle records, taxes, courts, and many services.
Starting point
Confirm the address is inside local limits first.
If the address is inside Union City, city or town offices may handle local permits, code, and services. If it is outside limits, county routing may be the better first stop.
A mailing city is not always the same as city government jurisdiction.
2025 population
65,282
Land area
19.398 sq mi
Water area
0 sq mi
Directory notes
Local layers to keep on the same page.
Confirm city or town limits.
A mailing address can use a nearby place name. If the address is outside limits, county offices may handle permits, code, and land-use routes.
County still matters.
Alameda County can still matter for assessor, tax collector, recorder, court, public health, social service, and election records.
Some layers are separate.
Water, sewer, fire, school, utilities, coast, earthquake maps, wildfire zones, parks, and trails may point outside city hall.
County layer
County shown for Union City
Practical notes
Office, map, permit, and paperwork notes for Union City
Place note · Rules and licenses · Reviewed July 5, 2026
Union City permits depend on what kind of work is happening
Union City separates building, fire, encroachment, grading, transportation, alarm, and City Clerk permits, so the permit type matters before applying.
Place note · History and culture · Reviewed July 5, 2026
Union City still has Alvarado and Decoto under the map
Union City was formed from older Alvarado and Decoto roots, with railroads, canneries, steel work, and historic district buildings still shaping the local story.
Place note · Rules and licenses · Reviewed July 4, 2026
Union City business licenses include a zoning review
Union City business license applications for locations inside city limits go through Planning for zoning compliance before Finance finishes the license side.
Place note · Cars and driving · Reviewed June 30, 2026
Union City BART is the local bus-and-rail hinge
Union City Station brings BART, Union City Transit, AC Transit, Dumbarton Express, and local fare rules together in one practical transfer point.
County layer · Cars and driving · Reviewed July 7, 2026
Fremont street sweeping is a monthly curb habit
Fremont sweeps residential streets on set monthly days, so the safest routine is to check the schedule, move the car, and leave the curb clear.
County layer · Home and property · Reviewed July 7, 2026
Hayward earthquake prep is a normal home habit
Hayward sits in Bay Area earthquake country, so local preparedness is mostly about small home steps: a plan, a kit, alert signups, and a few checks around the house.
Almanac notes
Stories and local context near Union City
Place note · Outdoors
Dry Creek and Garin give Union City a ranch-hills escape
Dry Creek Pioneer and Garin Regional Parks connect Union City to former ranch land, Bay Area views, rolling hills, gardens, barns, trails, and open space.
County layer · History and culture
Ardenwood keeps Fremont's farm layer alive
Ardenwood Historic Farm gives Fremont a living farm history stop, with the Patterson estate, old farm work, and open East Bay space in one place.
County layer · Outdoors
Joaquin Miller Park gives Oakland redwoods above the city
Joaquin Miller Park covers 500 acres of Oakland hills with redwood groves, oak woodlands, creeksides, wet meadows, trails, and picnic areas.
County layer · History and culture
Livermore has a science doorway at the LLNL Discovery Center
Lawrence Livermore National Laboratory's Discovery Center gives Livermore a public science stop with exhibits, hands-on displays, visitor rules, and a virtual tour.
County layer · Outdoors
The Wave gives Dublin a summer waterpark and a year-round pool
The Wave in Dublin combines a seasonal outdoor waterpark with a year-round natatorium, lap swimming, swim lessons, fitness classes, slides, splash play, picnic areas, and locker rooms.
County layer · History and culture
Alviso Adobe tells Pleasanton's valley story in layers
Alviso Adobe Community Park connects Pleasanton to Native history, Spanish ranchos, cattle, Meadowlark Dairy, and a public park in the Amador Valley.
County layer · History and culture
Casa Peralta gives San Leandro a painted-tile history house
Casa Peralta connects San Leandro to Rancho San Antonio, a Spanish-style remodel, hand-painted Don Quixote tiles, and the city's museum district near downtown.
County layer · History and culture
Newark's roots run through bay landings, salt, and rail
Newark's early story includes bay landings, Mayhew's Landing, Green Point Dairy, salt production, and railroad work before the city chose its own path to incorporation.