Below is a list of Hollis OK zip codes. For your research we have also included Hollis Area Code, Time Zone, UTC and the local Harmon County FIPS Code. Each Hollis Oklahoma zip code has a center Longitude / Latitude point (the Hollis center is -99.912200927734 / 34.687000274658). For your convenience we have also indicated if that zip code in Hollis observes Daylight Savings time.