Summary: The data table and chart below provide comparisons with other cities in Alameda County as it pertains to household size of its citizens. When compared to other cities within Alameda County, Union City is at the top of the list when it comes to household size. This means that Union City has many family residents and this is further evidenced by the data table and chart displaying Percentage (%) of Family Households. By and large, Union City is a bedroom community where many families have chosen to reside.