Our History 

Spinsters of San Francisco (SOSF) is a social nonprofit of young professional women making a positive difference in the Bay Area through volunteering and fundraising. We believe that when a diverse and close group of ambitious women come together, we can accomplish great things for our community.  




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SOSF aspires to unite remarkable women in the San Francisco Bay Area through an active social network where members develop meaningful friendships, support each other professionally and make a lasting positive impact on our community.


SOSF was founded on November 6, 1929. Patricia Tobin (Mrs. Sheldon Cooper) hosted the first meeting in the ballroom of her grandparents’ home, the de Young house, at 1919 California Street. The Bachelors of San Francisco had already been formed, and the young women wanted to develop a sister organization. The first president was Harriet Brownell, who presided over the original membership of 35 young women.


90 Years Later

Today, SOSF has evolved into a professional, philanthropic, and social organization of over 200 members.

The group is comprised of professional and college-educated women between the ages of 21 and 35 who are dedicated to providing an influential and positive impact on the local community. SOSF’s strong commitment to improving the community is achieved by promoting voluntarism, encouraging leadership, and collaborating with other community philanthropic organizations.