The federal shutdown, now in its fourth week, is causing confusion and concern among landlords and tenants who depend on rental assistance.

The Department of Housing and Urban Development is still paying for individual housing vouchers used by low-income families. But some contracts that subsidize entire developments for low-income, disabled and elderly people have expired, affecting 2,306 households across the state, according to a list compiled by the National Low Income Housing Coalition. It’s unclear whether payments for those units are continuing.

“The longer this shutdown goes on, the more dire the situation becomes,” said Elizabeth Rohlfing, spokeswoman for the city’s Housing and Preservation Development, which administers some of HUD’s programs. “We need HUD back up and running. New Yorkers are counting on them.”

Mitchell Posilkin, general counsel at the Rent Stabilization Association, said property owners are experiencing a lot of uncertainty.

“They are unable to contact anyone at HUD to give them guidance as to whether their payments from HUD are going to be continuing or not,” he said.

HUD didn’t respond to a request for comment.