|• Total||4.3 km2 (1.7 sq mi)|
|• Land||4.3 km2 (1.7 sq mi)|
|• Water||0 km2 (0 sq mi)|
|Elevation||8 m (26 ft)|
|• Density||152.6/km2 (395/sq mi)|
Gillis falls under the school district of Iowa, a town 20 miles (32 km) to the southeast, though most parents send their children to schools much closer to home. Students who live in the Gillis community may attend Gillis Elementary on Topsy Road and Moss Bluff Middle School and Sam Houston High School in Moss Bluff.
- "Geographic Identifiers: 2010 Demographic Profile Data (G001): Gillis CDP, Louisiana". U.S. Census Bureau, American Factfinder. Retrieved August 15, 2014.