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“We should have been given more time to vet this map with people who are going to be directly affected,” Ms. Alston said. “The increase in African-American population warrants the same increase in representation.”

Mr. Busch, who served on a five-member redistricting commission that held hearings this summer throughout the state, said the map was based largely on residents’ wishes. Mr. O'Malley’s map was almost identical to one recommended by the commission.

Mr. Busch said many Western Maryland residents who work in Montgomery County or used to live there asked for a larger portion of the county to be included in the 6th District. He added that changes to Miss Edwards‘ district were made to satisfy Prince George’s residents who asked that they not share a representative with Montgomery County.

State Senate Majority Leader Robert J. Garagiola, Montgomery Democrat, has been widely speculated as a Bartlett challenger and has said he is considering a run. The 39-year-old senator’s Germantown home is in Democratic Rep. Chris Van Hollen’s district but would be moved into Mr. Bartlett’s under the plan.

The 85-year-old Mr. Bartlett said Wednesday that he still intends to run for re-election next year.