Maryland Gov. Larry Hogan (R) talks at a news conference Monday in Annapolis. To his left are Rep. Donna Edwards, Sen. Barbara Mikulski, Rep. Elijah E. Cummings and Rep. Chris Van Hollen — all Democrats. (Brian Witte/AP)

Maryland and Prince George’s County are willing to guarantee hundreds of millions of dollars on road improvements to try to lure the FBI to Prince George’s, instead of suburban Virginia, when the agency relocates from downtown Washington.

Key members of the state’s congressional delegation joined Gov. Larry Hogan (R) and Prince George’s County Executive Rushern L. Baker III (D) in Annapolis on Monday to say they are united in the effort to bring the FBI headquarters to either Greenbelt or Landover.

The Maryland locations are engaged in an intense competition with Springfield, in Fairfax County, to win the headquarters and an estimated 11,000 FBI jobs that will be consolidated from 20 sites across the region.

The General Services Administration is expected to make a decision early next year.

“We are fully committed to the FBI coming to Maryland,” Hogan said during a news conference inside the State House.

He was surrounded by members of Maryland’s congressional delegation, including House Minority Whip Steny H. Hoyer (D) and Baker.

Hoyer and others in the group referred to themselves as “Team Maryland,” and they said the absence of former governor Martin O’Malley (D) and his preferred successor — former lieutenant governor Anthony G. Brown, who lost to Hogan last fall — “didn’t change a single bit of our unity of purpose.”

“We welcome Governor Hogan to the team,” Baker said, adding that Maryland has worked to attract the FBI to the state for the past four years. “His support will be a tremendous asset in our quest to bring the FBI to Prince George’s County.”

Erin Henson, a spokesman for the Department of Transportation, said the state would allocate money to build a highway interchange and associated road improvements to increase access to the headquarters site.

In Greenbelt, the estimated cost of engineering and constructing such a project is between $190 million and $210 million, Transportation Secretary Pete Rahn said.

The funding would include federal transportation revenues allocated to Maryland, as well as some state and local resources.

Maryland is waiting for information from GSA to determine the cost of the same type of work in Landover, Rahn said.

“We’re showing that we’ve got the politics, we’ve got the muscle,” said Sen. Barbara A. Mikulski (D-Md.).

Rahn insisted that providing the money would not be an issue, despite budget constraints facing the state.

“If the transportation is what is dependent upon the FBI to locate here, we will find the money,” Rahn said.

Hogan met with the congressional delegation Monday before the news conference, discussing the FBI headquarters but also other priorities that the state is seeking help from the federal government. Those include funding and other assistance in dealing with transportation projects and affordable housing.

In addition to Hoyer and Mikulski, who recently announced that she would retire after 2016, the gathering included two members of Congress who have launched candidacies to succeed her in the Senate: Chris Van Hollen (D) and Donna F. Edwards (D).

They stood at the news conference on either side of Rep. Elijah E. Cummings (D), who is also weighing a bid. Sen. Benjamin L. Cardin (D) was there as well, along with Lt. Gov. Boyd K. Rutherford (R).