Three of the Marines were from the Inland Empire and one was living in Orange County.
On Tuesday, the city of Murrieta plans to honor all 13 lives lost in last week's bombing at the Kabul airport, including Cpl. Hunter Lopez, 22, of Indio, Lance Cpl. Kareen Mae'Lee Grant Nikiui, 20, of Norco, and Lance Cpl. Dylan Merola, 20, of Rancho Cucamonga.
Marine Staff Sgt. Darin Taylor Hoover, 31, who lived in Aliso Viejo, was also killed in the bombing. He had served in the Marines for 11 years.
The "Remembrance Ceremony Honoring Fallen Service Members" is set for 6 p.m. at the Town Square Park Amphitheater.
Other tributes to the soldiers and online fundraisers for the families are being planned.
City officials in Indio are hoping to honor Lopez -- the son of Riverside County sheriff's Deputy Alicia Lopez and sheriff's Capt. Herman Lopez -- with a plaque on the Wall of Heroes and a soldier banner at Veterans Park, with the consent of his parents.
On Sunday morning, Nikoui was remembered during a "Memorial Hike to Pumpkin Rock" planned by the Norco High School Junior ROTC, the Corona-Norco Unified School District and the city of Norco. Nikoui graduated from Norco High School in 2019 and served in JROTC.
"Everybody wants to do everything and anything they can do to help. We're a small community and everybody knows everybody," said Natalie George with the Norco American Legion.
Merola, who was a graduate of Los Osos High School, was honored Friday during the school's first football game of the season by students wearing red, white and blue.
Gov. Gavin Newsom has ordered flags at all state buildings to be flown at half-staff in honor of all the fallen soldiers.
GoFundMe pages have been created in honor of Hoover, Merola, and Nikoui.
City News Service contributed to this report.