Undated (AP) _ On the Cincinnati street where Gary Weber lived until he donned a uniform, neighbors flew U.S. flags in patriotic sympathy for the young Marine corporal shot to death with five other Americans at an outdoor cafe in El Salvador.

''This is a very patriotic street,'' neighbor Loretta Schlosser said Monday. ''And this is a way to bring the neighborhood together in sympathy.''

Jean Kromme, who remembers driving Weber to high school with her sons, unfurled the American flag she received when her husband died.

''This was the first time I ever unfolded it,'' she said. ''It really had an effect on me in more than one way, but I think it was a good thing to do.''

The bodies of Weber, 22, and three other Marine guards at the U.S. Embassy in San Salvador were returned to their homes Monday.

They died Wednesday along with two American businessmen and seven Salvadorans as gunmen dressed as Salvadoran soldiers sprayed the cafe with bullets. The Marines were in civilian clothes.

The funeral for Sgt. Billy Joe Dickson, 27, was scheduled today at Sunset Funeral Chapel in the Tuscaloosa, Ala. suburb of Northport, where he lived. Burial will be in Sunset Memorial Park Cemetery.

For Weber, a funeral Mass is scheduled Wednesday at St. Antoninus Roman Catholic Church in Cincinnati, with burial to follow in St. Joseph Cemetery.

In the Dayton, Ohio suburb of Beavercreek, the family of Sgt. Thomas T. Handwork, 24, prepared for his funeral Wednesday, with visitation scheduled for tonight at Tobias Funeral Home. Burial will be at Mount Zion Shoup Cemetery.

The funeral of the fourth Marine, Cpl. Patrick Robert Kwiatkowski, who would have been 21 last Friday, is also scheduled for Wednesday, at St. Mary's Roman Catholic Church, in Wausau, Wis., where he was an altar boy. Burial is planned at Restlawn Memorial Park.

At weekend ceremonies at Andrews Air Force Base in Maryland, President Reagan tried to console the families of the four Marines.

Thomas and Trudy Handwork said the ceremonies and condolences of dignitaries such as Reagan, Sen. John Glenn, D.-Ohio, and Secretary of State George Shultz helped ease the pain.

''It made you feel good that you know people care. It helps a lot,'' said Mrs. Handwork, whose son had been a Marine for six years. ''We're grieving now, but he died doing something he loved.''

John Handwork said he told Reagan Saturday how much his son respected the president. ''I told him, well, we do also. We consider him the greatest president who ever lived and Tom did also,'' Handwork said.

In Wausau, meanwhile, Kwiatowski's sister, Bobette Ambriz, gave birth Monday to a 7-pound, 4-ounce boy she named after her brother.

Mrs. Ambriz, 29, had been hoping her baby would be born on her brother's birthday. ''He was going to call us on his birthday to see if the baby had been born,'' she said.

In Miami, the family of George Viney, 48, one of the American businessmen killed in the San Salvador attack, held a funeral Mass for him Monday at St. Louis Roman Catholic Church, with a eulogy read by his only son, George Jr.

A naturalized American born in Venezuela, Viney was in El Salvador for his employer, Wang Laboratories, teaching a local distributor about new computer software. His body was flown to Miami last Thursday. Burial will be in Venezuela, family members said.

A service for Robert Alvidrez, 47, who also worked for Wang, was tentatively scheduled for today at Rose Hills Memorial Park in Whittier, Calif. The body was returned to Southern California on Sunday.

A longtime resident of Burbank, Calif., Alvidrez and his wife, Sherrie, had lived for several years in Lexington, Mass., near Wang headquarters.