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Purchase Union City, CA 559 area code phone numbers for your business


Spanning an area of 19.469 square miles and containing a population of 71,763, Union City, California, is a city in Alameda County. Although some Union City phone numbers have a 559 area code, Union City is primarily in the 510 area code region. Union City's total population includes approximately 20,433 households, 44.4% of which feature children under the age of 18, and 4.9% of which feature persons 65 years of age or older. With a median age of 36.2 years, a population density of 3,700 people per square mile, and a male-to-female ratio of 100 females for every 98.9 males, Union City is a combined community of Alvarado and Decoto, incorporated in 1959. In terms of business, Union City contains 4,820 companies, which give the city a specialization in industries such as computer and electronic products manufacturing, professional and business services, construction, administrative services, waste management services, social services, and accommodation and food services. Union City also serves as a home for many other manufacturing companies interested in the city, due to its proximity to San Francisco and the Silicon Valley.

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Cities in the 559 area code are Madera and Visalia.

Nearby area codes include 209831661, and 805.