The Petaluma Council was founded in 1921 .
The Petaluma Council was became the Sonoma - Mendocino Council ( # 041 ) when the Scouting districts of northern Sonoma County and Mendocino County were separated from Silverado Area Council in 1942 .
The Petaluma Council was founded in 1921 , and became the Sonoma - Mendocino Council ( # 041 ) when the Scouting districts of northern Sonoma County and Mendocino County were separated from Silverado Area Council in 1942 .