A new analysis of party identification, based on more than 10,000 interviews of registered voters conducted by Pew Research Center in 2017, finds that 37% of registered voters identify as independents, 33% are Democrats, and 26% are Republicans. For decades, women have been more likely than men to identify as Democrats or lean Democratic. But today, a 56% majority of women identify as Democrats or lean Democratic, while 37% affiliate with or lean toward the GOP. The share of women identifying as Democrats or leaning Democratic is up 4 percentage points since 2015 and is at one of its highest points since 1994. Voters who have completed college make up a third of all registered voters. And a majority of all voters with at least a four-year college degree (58%) now identify as Democrats or lean Democratic, the highest share dating back to 1994. Just 36% affiliate with the Republican Party or lean toward the GOP. The much larger group of voters who do not have a four-year degree is more evenly divided in partisan affiliation. About half of white voters (51%) identify with the GOP or lean Republican, while 43% identify as Democrats or lean Democratic. These figures are little changed from recent years. By contrast, African American voters continue to affiliate with the Democratic Party or lean Democratic by an overwhelming margin (84% Democrat to 8% Republican). Hispanic voters align with the Democrats by greater than two-to-one (63% to 28%), while Asian American voters also largely identify as Democrats or lean Democratic (65% Democrat, 27% Republican). Most white voters with at least a four-year college degree (53%) affiliate with the Democratic Party or lean Democratic; 42% identify as Republicans or lean Republican. Millennial voters are more likely than older generations to affiliate with the Democratic Party or lean Democratic. Nearly six-in-ten Millennials (59%) affiliate with the Democratic Party or lean Democratic, compared with about half of Gen Xers and Boomers (48% each) and 43% of voters in the Silent Generation. In this report, the analysis of changes in party identification over time is based on a compilation of 257 surveys and nearly 350,000 interviews among registered voters conducted by the Pew Research Center from January 1994 to December 2017.