Below is a list of Lamar AR zip codes. For your research we have also included Lamar Area Code, Time Zone, UTC and the local Johnson County FIPS Code. Each Lamar Arkansas zip code has a center Longitude / Latitude point (the Lamar center is -93.394 / 35.4359). For your convenience we have also indicated if that zip code in Lamar observes Daylight Savings time. For more information on Lamar Arkansas you will find helpful business links and searches.