The few incumbents in Boston who faced primary challengers fended them off in a rare election last Thursday as just over 10 percent of voters turned out to cast ballots.

Embattled state Rep. Carlos Henriquez, running in the Democratic primary, coasted to a win with 1,343 votes, according to an unofficial tally on the Boston Elections Department’s website. There were 134 write-in votes, the website said.

Frequent candidate Althea Garrison and Meetinghouse Hill Democrat Nanci Conklin Lawton waged last-minute write-in campaigns, with Garrison sending a letter to residents asking for their vote while slamming Henriquez over his arrest on kidnapping and assault charges. Garrison will be on the November ballot; she is running against Henriquez as an independent.

Henriquez has pleaded not guilty to the charges and is due back in court later this month. “I thought it was less about me and more about the residents,” Henriquez, who represents parts of Dorchester and Roxbury, said in a phone interview on election night. “And I think their vote today showed my commitment to community.”

District 1 City Councillor Sal LaMattina, who was looking to take the vacant job of Suffolk County Register of Probate, lost the Democratic primary to fellow East Bostonian Patty Campatelli by roughly 600 votes, despite extensive support from his colleagues on the City Council. LaMattina lost the city of Boston by 799 votes. Suffolk Criminal Clerk of Courts Maura Hennigan beat back a primary challenge from past opponent Robert Dello Russo by 7,500 votes.

No Republicans are on the ballot for Suffolk Register of Probate in November, or for most other races in Boston.

State Sen. Sonia Chang-Diaz, a Jamaica Plain Democrat who represents parts of Dorchester and Mattapan, picked up 8,875 votes to perennial candidate Roy Owens’s 1,771 votes.

Other members of the Dorchester delegation, which includes state Sen. Jack Hart and state Reps. Marty Walsh, Linda Dorcena Forry, and Russell Holmes, did not face opposition in the Democratic primary and are not expected to face opponents in the November election.

Congressman Stephen Lynch, a South Boston Democrat, will face Republican Joe Selvaggi in November. Selvaggi triumphed over Matt Temperley of Quincy in the Republican primary.

Most of Boston is represented by Congressman Michael Capuano, a Somerville Democrat. He did not have a Democratic opponent and is unlikely to confront a Republican challenger in November.