Our new analysis of the 2020 decennial Census finds that same-sex couples live in every state. At the time of the Census, Washington, D.C. had the highest concentration of same-sex couples, with 26 couples per 1,000 households, followed by Delaware (13). North Dakota (4) and South Dakota (4) had the lowest rates.

Over half of cohabitating same-sex couples in nearly every state were married. The proportion of same-sex couples who were married was highest in Delaware (66%). Fewer than half of same-sex couples were married in only three states—Louisiana (49%), North Dakota (48%), and West Virginia (47%)—and Puerto Rico (33%).

States and territories with the highest and lowest percentage of same-sex couples who are married

Explore our new interactive tool featuring 2020 Census data on same-sex couples with detailed information on gender, race/ethnicity, and relationship status at the national, state, and county levels. The tool also identifies the top 25 large, medium, and small cities with the highest proportions of same-sex couples.

On September 29, the American Academy of Pediatrics will award Nanette Gartrell, M.D., Williams Institute Distinguished Visiting Scholar, with the 2025 Elle Perrin Award for Excellence in LGBTQ+ Health and Wellness. The award honors Dr. Gartrell for her significant research contributions in the field of LGBTQ youth and families. The award will be presented at the 2025 AAP National Conference & Exhibition in Denver, Colorado. 

We are conducting a study to improve services for LGBTQ individuals affected by the Los Angeles fires. If you were directly impacted, join us for a community listening session at the Altadena Library. Lunch will be provided, and the first 60 attendees will receive a free air purifier.

Join us at Bar Flores in Los Angeles for the launch of two groundbreaking reports on LBTQ Latinas in Los Angeles and discover how the findings can inspire activism, art, community, and change. 

Join us for an event in Palm Springs with Williams Institute scholars. The afternoon will include a discussion on upcoming research about LGBTQ older adults and what's at stake for all LGBTQ people in the current legal and policy landscape. Hosted by Henry Jung, Mark DeAngelis, and Ryan Leaderman.

The Williams Institute at UCLA School of Law is an academic research institute dedicated to conducting rigorous, independent research on sexual orientation and gender identity law and public policy.