District 3 will get a new city councillor this year. Whoever it is will also get new district boundaries, and the voters and constituents within them

The City Council passed, and Mayor Wu last week signed off on a redistricting map that features redrawn borders of the nine districts, including Dorchester-based District 3. If the map holds up to legal scrutiny, the new borders will remain in place over the next decade.

This latest redistricting process was largely driven by population numbers supplied by the 2020 US Census – while neighboring South Boston-based District 2 had too many residents and needed to lose precincts, District 3 needed to gain people and add precincts.

That largely meant that District 3 had to expand to the north. The district already had the area around the South Bay Shopping Plaza and the Boston University medical campus, and now will pick up more of the South End, including most of Widett Circle up to the Mass. Turnpike and Herald Street.

In its middle, District 3 gains Ward 16’s Precincts 1 and 3, known as “Little Saigon” in Fields Corner, while losing Ward 15 Precinct 1, part of the Quincy Street corridor, to District 4, which includes Dorchester and Mattapan.

At its southern end, the border remains the same, and Ward 17-Precinct 13, with its polling location at the Lower Mills Library, stays inside the district along its southwest border.

Most of Dorchester Avenue is kept within District 3’s lines, all the way up to where the major thoroughfare meets Southampton and Preble streets.

Savin Hill’s Frank Baker, who first won the District 3 seat in 2011, succeeding Maureen Feeney, isn’t running for reelection, a decision that has led to at least seven people indicating their interest in becoming the next councillor.

There are a couple of caveats to note: The signature-gathering process was thrown into disarray when a federal judge ordered a do-over of last fall’s redistricting map. Councillors handled that late last week, but deadlines had to be pushed back through a bill that Gov. Maura Healey signed on Tuesday. The last date for nomination signatures that candidates have to gather shifts to June 23, from May 23.

Barring a legal challenge to the new map, or more complications with redistricting, the preliminary is slated for Sept. 12 and the general election is scheduled for Nov. 7.

Here’s a look at who might be on the Sept. 12 ballot, if they have been residents of the district for a year before the election, clear the signature threshold (200 names), and get up and running.

John FitzGerald of Oakton Avenue (Adams Village)
A veteran of Mayor Marty Walsh’s administration and the Boston Planning and Development Agency (BPDA), FitzGerald is currently the BPDA’s deputy director of operations for real estate. The father of three is the son of the late Kevin Fitzgerald, the Mission Hill state lawmaker who passed away from cancer in 2007.

Jennifer A. Johnson of Mount Ida Road (Meetinghouse Hill)
Johnson, who has served as president of the Meetinghouse Hill Civic Association and on the board of Bowdoin Geneva Main Streets, was one of two candidates who jumped into the race early, when it was still unclear what Baker’s plans were. The owner of a small business focused on employee benefits insurance, she previously ran for the Fifth Suffolk House seat.

Barry Lawton of Willis Street (Uphams Corner/Savin Hill)
Lawton has worked as a schoolteacher and as a government aide inside City Hall (Councillor Gareth Saunders) and the State House (State Rep. Royal Bolling Jr.). The father of two has also mounted runs for the Fifth Suffolk House seat. This is his first run for a City Hall seat.

Pat O’Brien of Franconia Street (Adams Village)
O’Brien, an Army veteran, has experience at the State House and inside the Registry of Motor Vehicles. He worked as an aide for former state Sen. Linda Dorcena Forry of Dorchester and her successor, Nick Collins of South Boston.

Matt Patton of Savin Hill Avenue (Savin Hill)
The labor attorney, a father of two, works for the law firm co-founded by Shannon Liss-Riordan, who ran for state attorney general in 2022. Aside from working on her campaign, Patton’s jobs in politics have included time on John Barros’ 2013 mayoral campaign and on Elizabeth Warren’s first run for US Senate in 2012.

Joel Richards of Parkman Place (Fields Corner)
A teacher at the South End’s Blackstone Elementary School, Richards previously served as president of Fields Corner Main Street and helped create and plan Dorchester’s Juneteenth celebration. Richards, a self-described socialist, unsuccessfully ran for the District 4 seat in 2021. This year’s redistricting process flipped him and his home precinct into District 3, and he was one of two candidates to jump into the race earlier this year.

Rosalind Wornum of Bruce Street (Ashmont)
Wornum, a single parent of four, is the parent-liaison for enrollment at the Davis Leadership Academy in Fields Corner. She is also a housing activist who works closely with City Life/Vida Urbana, a community organization.