Below is a list of Newcastle OK zip codes. For your research we have also included Newcastle Area Code, Time Zone, UTC and the local Mcclain County FIPS Code. Each Newcastle Oklahoma zip code has a center Longitude / Latitude point (the Newcastle center is -97.6244 / 35.2506). For your convenience we have also indicated if that zip code in Newcastle observes Daylight Savings time. For more information on Newcastle Oklahoma you will find helpful business links and searches.