California is the state with most zip codes in the list, San Francisco leads for cities. The Golden State is followed by New York, which features 19 zip codes in our ranking. Besides California, New York, and Florida, 8 other states managed to break into the top. Washington, Massachusetts, Connecticut, and New Jersey each have 2 zip codes featured while Colorado, Nevada, Maryland, and Hawaii rank with 1 zip code each.How do you look up a ZIP code?
Find the ZIP code of an exact address by visiting USPS.com and clicking on the Look Up a ZIP Code button under the Quick Tools main menu option. On this page, enter in the street address and unit or apartment number along with the city and state in which the address exists.