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. In 1992, the Sonoma-Mendocino Council merged with the Redwood Area Council (#044), to form the Redwood Empire Council. The Redwood Area Council was founded in 1923. In early 2012, Scouting in Humboldt are Del Norte Counties were reassigned to Crater Lake Council (Oregon), while Redwood Empire Council retained the Scouting programs in Sonoma and Mendocino Counties.