At least three Washington-area residents, including a young Marine, an official with the Agency for International Development and the CIA's top Middle East intelligence officer, have been listed among the dead or missing in Monday's bombing of the U.S. Embassy in Beirut.

The rubble of the embassy was being searched yesterday for about a dozen persons listed as missing and presumed dead, but whose names have not been released.

Among the known dead were seven Americans, three of them from Virginia.

A fourth resident of Virginia, Marine Cpl. Robert McMaugh of Manassas, had been guarding the front door of the embassy and was one of nine Americans listed as missing and presumed dead.

Among those confirmed as having died in the terrorist bombing were Robert Clayton Ames, 49, a Reston resident for the past dozen years, who was described by a CIA spokesman yesterday as "the top Middle East analyst in the entire intelligence community," and William R. McIntyre, 52, deputy director of the AID mission in Lebanon, a resident of McLean.

An Appomattox resident, Army Staff Sgt. Ben. H. Maxwell, also was listed as dead.

The CIA, which traditionally is reluctant to provide information about its employes, confirmed Ames' death "because he is well known," a CIA spokesman said. Ames was the director of the office of Near East and South Asian Analysis and had been on "an orientation trip" to Beirut, the agency said.

Reston residents said that Ames and his wife, Yvonne, had lived in Reston for about 12 years and had six children, four of whom attend Fairfax County public schools.

Former associates of Ames said yesterday that he was one of the government's leading Arab intelligence experts and had been stationed in Beirut in 1970 and in Iran when Richard Helms, former head of the CIA, was the ambassador there.

A retired high-level CIA official, who asked not to be named, remembered Ames as "a hard-driving type, fluent in Arabic."

McIntyre, one of three AID officials killed, was praised yesterday by AID Administrator Peter McPherson, who said: "I have never known anyone who cared more about his work than Bill. He gave his all, every day, to everything he did."

McIntyre's wife, Mary Lee, who had accompanied her husband to Lebanon, was injured in the bomb blast and was listed in stable condition in a Beirut hospital.

Earl McMaugh said yesterday that his son had "died doing what he wanted to do."

"He joined the marines after graduating in 1980, from Osbourn High School in Manassas to help him decide what direction to go in," the father added. "And he called us Saturday to say he thought he'd found something, that he wanted to make a career in the Marines and possibly go to officer candidate school."

Maxwell, a former teacher, had been sent to Beirut to help train Lebanese soldiers in maintaining armored personnel carriers. His mother said yesterday that Maxwell had written recently to say that people in Beirut "were crazy . . . walking around the streets with guns and everything else."