The smaller city portion of her district includes the Bolton Hill home of freshman Del. Keiffer Mitchell, a Democrat who may launch a run for a seat in the other chamber. In addition, the homes of the other two delegates currently representing the district, Keith Haynes and Melvin Stukes, would be moved to the 40th and 41st, respectively. That sets up two House races in 2014 where incumbents would be forced to run against each other.

Pushing part of Jones-Rodwell's district into the county sets off a wave of changes. Sen. Delores G. Kelley, the county's only African-American senator, would have a district that's still majority black, but less so.

Sen. Robert Zirkin picks up Democrats from Pikesville, a municipality that is reunited under him under the plan.

Most dramatic is the change to the district represented by Democratic Sen. James Brochin, who has opposed O'Malley on several issues, including his 2007 tax package. Brochin's seat would have a majority of Republican voters under the new map. Four delegates — three of them Republican — live in that new district.

Brochin's new geographic area starts in Towson and runs north, nearly hitting the Pennsylvania border. "They certainly did everything they could do to make my political life difficult," he said.

Other significant shifts come around the Washington suburbs, particularly in Prince George's County, which did not grow as fast as the rest of the state.

The district represented by Miller shifts more into Calvert County, where Miller lives. Also, the new version of his district pulls in a small portion of Charles County, giving the powerful Senate president a vote in three county delegations.

In 2002, a proposed map was drawn to give Miller a district that included four counties: Charles, Calvert, Prince George's and Anne Arundel. But the map was redone by a judge who left him with only part of Prince George's and Calvert.

In a surprising move, the district held by Vallario, a Democrat who now represents Calvert and Prince George's counties, is moved north into a new area. "I'm very much going to miss my old district," Vallario said. "I'm not happy about that at all."

The district held by Busch also would change. He would lose some Republicans from the Broadneck peninsula.

Baltimore Sun reporter Michael Dresser contributed to this article.

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