The states with the highest concentrations of same-sex married couples were along the West Coast of the United States, in the Northeast, plus Delaware, the District of Columbia, Florida, Hawaii and New Mexico (Figure 1c).
Several states with relatively low percentages of same-sex couples were concentrated in the West North Central Midwest, including Iowa, Kansas, Nebraska, North Dakota and South Dakota. Idaho, Montana and Wyoming in the West also had relatively low percentages of same-sex couples.
Unlike the inverse pattern seen for opposite-sex married and unmarried couples, the geographic pattern for same-sex unmarried couples mirrored that of same-sex married couples.
The West Coast and Northeast again contained some of the states with the highest percentages of same-sex unmarried couples, along with the Southwest, District of Columbia, Florida, Hawaii and Puerto Rico (Figure 1d).
Similar to same-sex married couples, states in the West North Central Midwest were among those with the lowest percentage of same-sex unmarried couples.