CHEYENNE, Wyo. (AP) — Former Massachusetts Gov. Mitt Romney picked up four delegates in the first round of Wyoming's Republican presidential caucuses — a county-run affair that runs through this week.

Texas Rep. Ron Paul won the fifth delegate up for grabs on Tuesday. Seven more delegates to the Republican National Convention will be chosen at county caucuses on Wednesday and on Saturday.

Romney won 56 percent of Tuesday's caucus vote in six counties. Former Pennsylvania Sen. Rick Santorum won 30 percent, Paul 2 percent and former House Speaker Newt Gingrich 0 percent. Eleven percent of the 528 caucus votes were uncommitted, according to unofficial results.

In Laramie County, Wyoming's most populous, Romney edged Santorum by just two votes to pick up his first Wyoming delegate.

Niobrara County holds its Republican caucus on Wednesday evening.