A Post graphic focuses on cuts at large national parks, as well as D.C. monuments and museums.
Polling data shows that 56 percent of Americans disapprove of the government-wide spending cuts.
Which agencies have placed employees on unpaid leave? How many reduced their furlough days?
The Office of Personnel Management cut overtime for workers handling pension claims, an area where the agency has struggled to keep up in recent years.
The spending bill Congress approved last month has allowed some agencies to eliminate or reduce the number of days they expect to furlough employees under the sequester.
The legislation would allow the FAA to shift funds between accounts to end the furloughs that started Monday for air-traffic controllers.
Furloughs for U.S. Park Police employees began Sunday. The agency increased its presence at parks in response to the Boston Marathon bombings last week.
The agency's acting commissioner sent a memo informing employees of five dates for sequester furloughs.
The National Oceanic and Atmospheric Administration on Monday proposed furloughing employees across the agency for four days.
Pentagon officials are trying to eliminate some or all furloughs that the Defense Department initially expected as a result of recent government-wide spending cuts, the AP reports.