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By the numbers: Same-sex marriage

Story highlights

  • Twenty-nine states have anti-marriage laws
  • One state allows civil unions between same-sex couples, but not marriage
  • Nineteen states and the District of Columbia allow same-sex marriage
  • The U.S. Census showed 646,000 same-sex couple households in 2010

The Supreme Court gave proponents of same-sex marriage two major victories in 2013 -- striking down parts of the Defense of Marriage Act that denied the same benefits provided to heterosexual spouses to legally married same-sex couples, and allowing same-sex marriages to resume in California. Since then, a lot has has happened, legally, for supporters, including the right for same-sex couples to marry in five more states.

Here's a look at same-sex marriage in the United States, by the numbers:

29 -- The number of U.S. states with "laws or statutes that prohibit same-sex marriage."

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1 -- U.S. states that allow civil unions between same-sex couples, but not marriage: Colorado.

19 -- U.S. states that allow same-sex marriage, along with the District of Columbia: California, Connecticut, Delaware, Hawaii, Illinois, Iowa, Maine, Maryland, Massachusetts, Minnesota, New Hampshire, New Jersey, New Mexico, New York, Oregon, Pennsylvania, Rhode Island, Vermont and Washington.

44% -- Percentage of the U.S. population living in a state that allows same-sex marriage.

1,138 -- The number of federal benefits to marriage.

2001 -- The year the Netherlands made same-sex marriage legal. It was the first country in the world to so.

2003 -- The year that the U.S. Supreme Court ruled that it is unconstitutional to criminalize sodomy.

2004 -- The year that same-sex marriage became legal in Massachusetts, the first U.S. state to do so.

17 -- Countries worldwide where same-sex marriage has been approved in the entire country: Argentina, Belgium, Brazil, Canada, Denmark, France, Iceland, Luxembourg, the Netherlands, New Zealand, Norway, Portugal, South Africa, Spain, Sweden, the United Kingdom (England, Scotland, Wales), and Uruguay.

2 -- The number of countries where same-sex marriage is legal in some areas: Mexico and the United States.

27% -- Americans who thought same-sex marriage should be legal in 1996, according to a May 2014 Gallup Poll.

55% -- Americans who think it should be legal in 2014, according to the same poll.

3.5% -- The approximate percentage of Americans who identify as lesbian, gay or bisexual, according to 2011 research by the Williams Institute at UCLA, which is the same number reported as the national average in a 2012 Gallup Poll.

10% -- People identifying as LGBT living in the District of Columbia, according to a 2012 Gallup Poll. This is the highest percentage in the country.

1.7% -- People identifying as LGBT living in North Dakota, according to a 2012 Gallup Poll, the lowest percentage in the country.

646,464 -- Same-sex-couple households in the United States in 2010, according to the Census Bureau.

80.4% -- Percentage growth of same-sex couple households in the U.S. between 2000 and 2010, according to the Census Bureau.

25.3 -- Percentage of same-sex couple households in the United States in 2012 with children living with them, according to the Census Bureau.