Below is a list of Hammon OK zip codes. For your research we have also included Hammon Area Code, Time Zone, UTC and the local Roger Mills County FIPS Code. Each Hammon Oklahoma zip code has a center Longitude / Latitude point (the Hammon center is -99.376899719238 / 35.631801605225). For your convenience we have also indicated if that zip code in Hammon observes Daylight Savings time.