The signs, which will be unveiled at a ceremony Thursday, honor 207 fallen officers. For those killed outside the city or county, the signs will be put up near the officer's police station, the downtown administration building or the Elysian Park Academy grounds.
Each sign will have a number that the public will be able to use on a memorial website to learn more about how the officer died. People will also be able to leave video tributes, letter, poems and photographs to commemorate the officer's sacrifice.
The signs will be created and installed over the next six months, said LAPD Commander Richard Webb.
"Each day, we as Angelenos walk past certain locations, and we may not know there were sacrifices made there by people who represent them," Webb said.
The signs are to show people where officers made the "ultimate sacrifice," he said.
The first L.A. police officer killed was Clyde May in February 1907.