Voters who are most impacted have already been notified by mail, said Washington County Election Board Director Dorothy Kaetzel.
Later, the election board will send out cards to 25,000 of the 74,000 registered voters to tell them they now live in a different election district.
The boundaries are reconfigured once every decade to account for population shifts.
The primary election is Sept. 10 and the general election is Nov. 5.
Maxey undecided on future of campaign
Fred Maxey of Keedysville filed to run for House of Delegates in December, but he's still not sure if he's going to run.
Based on an early election redistricting proposal, Maxey, 38, thought he could run as a Republican in District 3B, which covers southern Frederick and Washington counties.
But when the final maps were released, Maxey's house was in District 2B, where Republican incumbents Del. Christopher B. Shank and Del. Robert A. McKee are going to duke it out.
Maxey said he has toyed with the idea of moving into 3B, but has had trouble finding a house to rent, he said.
He has until July 1 to decide, according to the Maryland State Elections Board.
Challenger attacks incumbent Bartlett
Don DeArmon tried to take the gloves off last week in his third attempt to unseat U.S. Rep. Roscoe Bartlett, R-Md.
In a prepared statement, DeArmon accused Bartlett of taking credit for a shadow bill that contained $16 million to complete a new barracks complex at Fort Detrick. The bill has not been introduced, he said.
"Tomorrow I fully expect a release saying, 'Sun rises in the east due to Bartlett efforts!'" DeArmon said.
Funny story, if it was true.
The Web site for Congress confirms that the Defense Appropriations bill was approved by the Armed Services Committee on Wednesday, two days after DeArmon's press release.
"It is kind and thoughtful for my opponent to make an issue of my leadership and indispensable role as a senior member of the House Armed Services Committee in securing the funding for three major construction projects at Fort Detrick," Bartlett said.