Below is a list of Williamsville NY zip codes. For your research we have also included Williamsville Area Code, Time Zone, UTC and the local Erie County FIPS Code. Each Williamsville New York zip code has a center Longitude / Latitude point (the Williamsville center is -78.877899169922 / 42.886901855469). For your convenience we have also indicated if that zip code in Williamsville observes Daylight Savings time.