Gilliam is a village in Caddo Parish, Louisiana, United States. The population was 164 at the 2010 census. It is part of the Shreveport–Bossier City Metropolitan Statistical Area. On May 13, 1908, a tornado struck the community around dinnertime, killing 34 people and devastating the town, leaving only two homes standing. Fifteen other…Gilliam is a village in Caddo Parish, Louisiana, United States. The population was 164 at the 2010 census. It is part of the Shreveport–Bossier City Metropolitan Statistical Area. On May 13, 1908, a tornado struck the community around dinnertime, killing 34 people and devastating the town, leaving only two homes standing. Fifteen others were killed in nearby communities.