The Williams Institute studied 2010 U.S. Census data and concluded that gays and lesbians live in 99% of the counties of the United-States, which represents 901.997 couples.
There would be 60% lesbian couples, 40% couples of gay men and 22% raise children.
Williams Institute demographer Gary Gates said in a press release that the "Child-rearing among same-sex couples is most common in the Deep South and Mountain West regions".
"In these socially conservative areas, LGBT people likely come out later in life and are more likely to have a child from a relationship with a different-sex partner when they were younger."
The big gay cities are San Francisco; Seattle; Oakland, CA ; Minneaoplis and Atlanta.
Then in the cities a little less large, there are Fort Lauderdale, FL; Berkeley, CA; Salt Lake City; Cambridge, MA and Orlando, FL.
Lastly, in the towns of less than 100.000 residents, the gay cities are Provincetown, MA; Manors of Wilton, FL; Palm Springs, CA; Rehoboth Beach, DE and Guerneville, CA.