Below is a list of Monroe OR zip codes. For your research we have also included Monroe Area Code, Time Zone, UTC and the local Benton County FIPS Code. Each Monroe Oregon zip code has a center Longitude / Latitude point (the Monroe center is -123.319 / 44.3243). For your convenience we have also indicated if that zip code in Monroe observes Daylight Savings time. For more information on Monroe Oregon you will find helpful business links and searches.