Gilliam is a community located in the U.S. state of Louisiana. It is within Caddo County included in the Shreveport–Bossier City Metropolitan Statistical Area. It has a total area of 2.00 square miles at 32°49′39″N 93°50′40″W. The elevation is 190 feet above sea level. As of the 2010 census data, it had a total population of 164. The population density was 78.80/sq mi. Estimated per capita income in 2016 was $32,606. It has Zip code 71029.