Alameda County – 94587 – Union City – CA – 18/46
Alameda County – 94587 – Union City – CA – 18/46
Cities: Union City, CA (97.24%), Hayward, CA (2.76%)
County: Alameda County, CA
Estimated zip code population in 2011: 68,830
Zip code population in 2010: 69,516
Zip code population in 2000: 66,457