More than 591,000 same-sex couples tied the knot in the decade since the Obergefell v. Hodges decision made marriage equality the law of the land.

That’s according to recently published research from the Williams Institute at UCLA School of Law that looks at the impact of the June 26, 2015, Supreme Court ruling. The academic institution figures that there are roughly 823,000 queer married couples in the U.S. today, double the number at the end of 2014, the last full year when states could bar same-sex unions.

Before the court decision made clear that same-sex couples in every state had a constitutional right to wed a partner regardless of gender, many states, particularly in the South, prohibited such marriages. Thanks to that, the percentage of cohabitating same-sex couples who were married in the South jumped by 21 percent after the ruling, compared to a 16 percent leap in the West, a 15 percent jump in the Midwest and just an 11 percent spike in the Northeast, where many states allowed gay couples to marry before the ruling.

As a demonstration of the significance of the court decision, about 59 percent of all cohabiting same-sex couples in the country are now married, according to the Williams Institute. Wedded couples made up a majority of cohabiting same-sex couples every year since 2016, the first full year when the decision was in effect nationwide.

The decision also significantly impacted the makeup of modern families. Over 300,000 U.S. children are now being raised by married same-sex couples.

But the data also shows the number of families under threat as a growing number of right-wing politicians push to reverse marriage protection. Indeed, Supreme Court Justice Clarence Thomas made clear he’d be willing to overturnObergefell if given the chance when a conservative majority tossed the 50-year-old Roe v. Wade decision.

The Williams Institute noted that 433,000 married couples — and 305,000 unmarried ones — still live in states with laws banning marriage equality on the books. Those bans cannot be enforced because of Obergefell, but would immediately go into effect if the conservative majority brushed the decade-old decision aside.

A survey found 80 percent of same-sex couples were concerned about an overturning of the decision, with 41 percent “very concerned.” About 25 percent of couples have already taken steps to preserve their family, whether that means speeding up marriage, securing second-parent adoptions, or relocating to a state without laws on the books.

But for the moment, love remains the chief reason 93 percent of same-sex couples wed, while 74 percent list companionship and 75 percent cite legal protections. Wedded bliss brings mental health rewards as well, with 83 percent saying it improves a sense of safety and security, 75 percent proclaiming it boosts life satisfaction, and 67 percent saying it helps relationship stability.

All these gay weddings also brought a financial boon to states, whether they have bans on the books or not. Spending on same-sex weddings provides a $5.9 billion boost to economies across the country, generating $432.2 million in state and local taxes.