Clam is a commune with 418 residents in the French department of Charente-Maritime in the Poitou-Charentes region. Clam is located i…Clam is a commune with 418 residents in the French department of Charente-Maritime in the Poitou-Charentes region. Clam is located in the arrondissement as well as in the canton of Jonzac. The residents are called Clamais.