About Geismar, LAGeismar is located in Louisiana. Geismar, Louisiana has a population of 8,615. Geismar is more family-centric than the surrounding county with 43% households with children. The county percentage for households with children is 39%. The median household income in Geismar, Louisiana is $83,947. The median household income for the surrounding county is $72,137 compared to the national median of $57,525. The median age of people living in Geismar is 34.6 years. Geismar WeatherThe average high temperature in July is 90.99 degrees, with an average low temperature in January of 41.21 degrees. The annual precipitation is 62.92. Geismar MapGeismar real estate officesReal estate near GeismarNearby CitiesNearby Cities Homes for Sale |