Trump won the state with 42 percent of the vote. Texas Sen. Ted Cruz was second with 33 percent. Florida Sen. Marco Rubio came in third with 13 percent of the vote, and Ohio Gov. John Kasich came in fourth with 11 percent.
There are just over 2,000 provisional votes that have to be counted yet this week. The Hawaii Republican Party will allocate delegates after that count is completed.
9:35 p.m.
Donald Trump has won Hawaii's Republican presidential caucus.
The Hawaii Republican Party ran Tuesday's caucus in a style similar to a primary election, meaning people cast their votes privately. The party set up polling stations on every island, for a total of 45 polling places at 44 locations.
Six candidates appeared on the ballot, including Ted Cruz, John Kasich, Marco Rubio and Donald Trump. Jeb Bush and Ben Carson also appeared, despite having dropped out of the race, since they did so after Hawaii's ballot deadline.
Hawaii will send 19 delegates to the Republican National Convention. Only Vermont and Delaware have fewer delegates, with 16 each, compared with Texas' 155.