Democratic presidential candidate Pete Buttigieg has hired 30 additional staffers in Iowa, the latest sign the South Bend, Indiana, mayor is building up his organization in the first-in-the-nation caucus state.

Buttigieg's campaign told the Des Moines Register on Thursday that the new staff includes a political director, an organizing director, a data director, an operations director and two dozen organizers. The staff will all be in Iowa by the end of June.

The announcement is a significant increase for Buttigieg's Iowa operations. In early May, the campaign announced it had four paid staffers in the state. Several other 2020 hopefuls have aggressively staffed up in Iowa, a sign of the importance of on-the-ground organizing.

Buttigieg's hiring move comes as his political profile in the state and around the country has risen dramatically. He was relatively unknown in Iowa when he visited in February. Several Iowa campaign visits later, a new Des Moines Register/Mediacom/CNN Iowa Poll shows Buttigieg near the top of a crowded Democratic presidential field.

Buttigieg trails former Vice President Joe Biden, who leads more than 20 Democratic candidates, according to the poll, which was conducted in early June. Vermont Sen. Bernie Sanders, Massachusetts Sen. Elizabeth Warren and Buttigieg are in close competition for second place. The poll had a 4% margin of error on its question of which Democratic candidate was the first choice for likely caucusgoers.

Kevin Groh will lead the organizing team in Iowa. He most recently served as a get-out-the-vote director for Stacey Abrams, the Democratic nominee for Georgia governor in the 2018 election.

Among the other new Iowa hires to Buttigieg's campaign is political director Julie Stauch, deputy political director Bailey Romans, data director Lala Xu, and operations director Matt Harrison.

Previous Iowa Caucuses staffing coverage:

According to the campaign, Stauch has decades of campaign experience in Iowa, including as Iowa press secretary for President Bill Clinton. Romans' experience includes serving as a caucus organizer in Des Moines for Hillary Clinton's presidential campaign in 2015.

Xu served as the deputy data director in 2018 for now-Illinois Gov. J.B. Pritzker; Harrison served recently as operations director at NextGen America.

Brendan McPhillips, Buttigieg's Iowa state director, said in a statement that the latest hiring reflects that the campaign is "fully investing in organizing efforts."

"We plan to engage Iowans where they are, in every precinct across the state," McPhillips said.

Buttigieg's campaign said it will hire additional staff in Iowa "in the coming weeks."