The Guardian Angels say 40 members for New York, New Jersey and Pennsylvania will arrive in Camden on Sunday.
Facing a budget crunch, the city expects deep layoffs in the government work force, effective Tuesday. About half the 370-member police force could be laid off, though the exact number will depend on whether police unions accept concessions.
Police Chief Scott Thomson has said he will reconfigure the force to maintain patrols.
Guardian Angels founder Curtis Sliwa said in a release Thursday that the patrols in Camden will run from 11 a.m. until midnight.
The group went into Newark in November when there were police layoffs there.