OK this list is old but interesting.
https://www.senioradvice.com/articles/top-20-cities-for-lgbt-retirement-2018
A little surprising to me are Providence and Baltimore.
'The growing senior population includes a demographic often difficult to calculate: seniors who identify as Lesbian, Gay, Bisexual or Transgender (LGBT). Older members of the LGBT community have to be even more selective about choosing where to retire. Not all cities in the US are welcoming to those living "non-traditional" lifestyles.
According to the national nonprofit Services and Advocacy for Gay, Lesbian, Bisexual & Transgender Elders (SAGE), today there are 3 million LGBT people age 55+ living in the United States. With that number increasing each year, the need to discover locations that are welcoming to LGBT elders also increases."