Below is a list of Longmont CO zip codes. For your research we have also included Longmont Area Code, Time Zone, UTC and the local Boulder County FIPS Code. Each Longmont Colorado zip code has a center Longitude / Latitude point (the Longmont center is -105.137 / 40.1657). For your convenience we have also indicated if that zip code in Longmont observes Daylight Savings time. For more information on Longmont Colorado you will find helpful business links and searches.