The Loudoun County Board of Library Trustees agreed last week on a plan to cut 35 percent from the libraries' budget.
The reduction will affect "all public services and internal operations," said Sally Hunt, director of library services.
Service at all five libraries and audio-visual and bookmobile services will be trimmed.
The plan calls for the Sterling library and the Thomas Balch library in Leesburg to close for two days a week, and the Lovettsville, Middleburg and Purcellville libraries to close for 1 1/2 days a week.
Programs such as the Saturday family films at Sterling, the local history or children's programs at Thomas Balch and children's programs in Lovettsville and Middleburg may be canceled, according to the board resolution.
The audio-visual service will be closed two days a week and the bookmobile will cancel residential stops, restricting service to weekly visits to nursing homes.
The plan is being sent to the county budget office, which then will send a 26 percent reduction package to the Board of Supervisors.
"This is the proposal that we're taking before the county administrator . . . . The last say will be his," said Joan Alsop, who heads the library board.
The plan does not affect the construction of new libraries in Leesburg and eastern Loudoun or the building of an addition to the Purcellville library.
In an unrelated development, the Purcellville Board of Library Trustees will donate up to $50,000 for renovation of the old part of the Purcellville library after the addition is completed.