Below is a list of O Neill NE zip codes. For your research we have also included O Neill Area Code, Time Zone, UTC and the local Holt County FIPS Code. Each O Neill Nebraska zip code has a center Longitude / Latitude point (the O Neill center is -98.648880004883 / 42.456401824951). For your convenience we have also indicated if that zip code in O Neill observes Daylight Savings time.