Warren County is set to pick up new representation in a Mississippi House redistricting plan unveiled at the state Capitol in Jackson Thursday night. A vote on the plan for the state’s 122 House districts was expected today.

The changes to the Warren County delegation are expected to come as the new lines make up for a population decrease in Issaquena and Washington counties, both in the Delta north of Warren.

Districts held by Democratic Reps. Willie Bailey and Rufus Straughter will be shifted to make up for lost population, said Warren County’s senior legislative delegate, Democratic Rep. George Flaggs.

Flaggs, a six-term legislator, said he will lose parts of his Vicksburg district, including the Kings area, and that Rep. Philip Gunn, R-Clinton, will lose the eastern part of the county. The net result of redistricting means Warren County will be served by five House members, instead of the current four, Flaggs said.

Rep. Alex Monsour, R-Vicksburg, is expected to pick up the territory in Yazoo County and that lost by Gunn.

A Democrat-led committee released the long-awaited map Thursday, and Republicans were studying it overnight.

The plan readjusts for population shifts revealed by the 2010 Census, including growth in the relatively affluent suburbs in DeSoto County, just south of Memphis, and population losses in the economically struggling Delta.

The Senate, which has 52 districts, plans to release its new map Monday.

Democratic Rep. Tommy Reynolds of Charleston, who led the House redistricting effort, said lawmakers tried to make as many groups happy as possible. He said Democrats and Republicans worked on reconfiguring the districts.

“Is this perfect?” Reynolds said in releasing the map. “Is anything human hands have to work on perfect? No. Is it an improvement? Yes.”

The House plan reduces the number of split precincts from 449 to fewer than 200. It goes from 39 majority-black districts to 44.

It adds two districts in DeSoto County, the Gulf Coast maintains its representation and the city of Madison gets its own House district, as it requested.

A district now represented by Republican Jim Ellington of Raymond is being absorbed into other Jackson-area districts. Ellington’s home has been put into a district represented by Democratic Rep. Walter Robinson of Bolton.

In the south Delta, two other lawmakers — Democrats Ferr Smith of Carthage and Mary Ann Stevens of West — were put into the same district. The largely rural Delta was among the areas with significant population loss between 2000 and 2010.

The district now represented by Greenville’s Bailey is expanded in the new plan, to include Issaquena County. Washington County was among the biggest population losers, so Bailey’s district had to take in more territory to gain residents.

Mississippi’s population is about 2.9 million, and Reynolds said the ideal population for a House district is 24,322. The districts don’t have to be exactly the same in population, but must be within 10 percent of each other — 5 percent above or below the ideal. Reynolds said the plan accomplishes that.

“What I’m anxious to discover is the overall impact of this map,” said Rep. Greg Snowden of Meridian, one of the many Republicans studying the map. “We’ve got some people doing that, giving us a better view of the big picture.”

The Joint Legislative Committee, which includes members of the House and Senate, unanimously approved the House plan soon after it was released Thursday.

Mississippi must submit its redistricting plans to the U.S. Justice Department, which will check to ensure that the plans don’t dilute minorities’ voting strength. Lawmakers say Justice approval can take up to 60 days.

Legislative candidates face a June 1 qualifying deadline for this year’s elections.