Republican Mitt Romney has won the Nevada presidential caucus with 50 per cent of the vote, more than twice his nearest rival Newt Gingrich on 21.1 per cent.
Texas Representative Ron Paul was a couple of points behind Gingrich on 18.7 per cent, followed by religious conservative Rick Santorum, a former US senator from Pennsylvania, with 9.9 per cent.
"The Nevada Republican Party congratulates Governor Mitt Romney on his victory as well as the entire field for their participation in the caucuses," said the state's acting party chairman James Smack on Monday.
"Republicans in Nevada are moving in the right direction, we continue to register more voters than the Democratic Party, and we are enthusiastic to move forward after our caucuses to beat Barack Obama and build on our GOP victories in 2010," he added in a statement on the state party's Twitter feed.
The win -- with slightly less than the 51.1 per cent he earned in 2008 -- was widely expected due to a combination of his well-oiled campaign machine in the western battleground state, and the large Mormon community sharing his faith.
Four years ago, Paul won 13.7 per cent in the state, while John McCain -- who went on to become the Republican presidential nominee, but lost to Barack Obama -- came third with 12.7 per cent.
The four remaining candidates have been campaigning for the last few days ahead of Tuesday's polls in Colorado, Minnesota and Missouri.
