Jabarkan Parti Demokrat dari Kaukus Iowa dalam bahasa melayu

1976 (19 Januari): Gerald Ford (45%), dan Ronald Reagan (43%)

1980 (Januari 21): George HW Bush (32%), Ronald Reagan (30%), Howard Baker (15%), John Connally (9%), Phil Crane (7%), John B. Anderson (4%), dan Bob Dole (2%)

1984 (20 Februari): Ronald Reagan (menang tanpa bertanding)

1988 (8 Februari): Bob Dole (37%), Pat Robertson (25%), George HW Bush (19%), Jack Kemp (11%), dan Pete DuPont (7%)

1992 (10 Februari): George HW Bush (menang tanpa bertanding)

1996 (Februari 12): Bob Dole (26%), Pat Buchanan (23%), Lamar Alexander (18%), Steve Forbes (10%), Phil Gramm (9%), Alan Keyes (7%), Richard Lugar (4%), dan Morry Taylor (1%)

2000 (Januari 24): George W. Bush (41%), Steve Forbes (31%), Alan Keyes (14%), Gary Bauer (9%), John McCain (5%), dan Orrin Hatch (1%)

2004 (19 Januari): George W. Bush (menang tanpa bertanding)

2008 (Januari 3): Mike Huckabee (34%), Mitt Romney (25%), Fred Thompson (13%), John McCain (13%), Ron Paul (10%), Rudy Giuliani (4%), dan Duncan Hunter (1%)

2012 (Januari 3): Rick Santorum (25%), Mitt Romney (25%), Ron Paul (21%), Newt Gingrich (13%), Rick Perry (10%), Michele Bachmann (5%), dan Jon Huntsman (0.6%)

2016 (Februari 1): Ted Cruz (27.7%), Donald Trump (24.3%), Marco Rubio (23.1%), Ben Carson (9.3%), Rand Paul (4.5%), Jeb Bush (2.8%), Carly Fiorina (1.9%), dan lain-lain (7.3%)