New Mexico became the most recent state to join the Compact in pledging to give its 5 electoral votes to the winner of the national popular vote in April 2019.
Colorado joined the compact in February 2019, and will give its 9 electoral votes to the popular vote winner.
Delaware, home to potential 2020 contender Joe Biden, also joined the compact earlier in 2019. It has three Electoral College votes.
California, which has 55 electoral votes, has been in the compact since 2011.
next slide will load in 15 secondsSkip AdSkip AdIllinois, which has 20 Electoral College votes, was the third state to join the compact in 2008.
Hawaii and its four electoral votes are in the compact.
Massachusetts, which has 11 Electoral College votes, joined the compact in 2010.
Massachusetts' next-door-neighbor Rhode Island, which has four Electoral College votes, is also in the compact.
Connecticut, which has seven electoral votes, joined the compact in 2018.
next slide will load in 15 secondsSkip AdSkip AdWashington, which has 12 Electoral College votes, became a member in 2009.
And Washington, DC, which has no voting representatives in Congress but three Electoral College votes, joined in 2010.
New Jersey, which has 14 Electoral College votes, became part of the compact in 2007.
Its neighbor New York, which has 29 Electoral College votes, joined the compact in 2014.
Maryland, which has 10 Electoral College votes, has been in the compact since 2007.
next slide will load in 15 secondsSkip AdSkip AdVermont, which has just three Electoral College votes, became part of the compact in 2011.