Below is a list of Geismar LA zip codes. For your research we have also included Geismar Area Code, Time Zone, UTC and the local Ascension County FIPS Code. Each Geismar Louisiana zip code has a center Longitude / Latitude point (the Geismar center is -91.022499084473 / 30.204200744629). For your convenience we have also indicated if that zip code in Geismar observes Daylight Savings time.