Below is a list of Adelphi MD zip codes. For your research we have also included Adelphi Area Code, Time Zone, UTC and the local Prince Georges County FIPS Code. Each Adelphi Maryland zip code has a center Longitude / Latitude point (the Adelphi center is -76.956100463867 / 38.960300445557). For your convenience we have also indicated if that zip code in Adelphi observes Daylight Savings time.