All federal, state and local county government offices in the Washington metropolitan area will be closed Friday in observance of the Independence Day holiday. Emergency and essential services will remain in operation.

Banks: In the District of Columbia, most financial institutions will be open Friday. Most Virginia institutions will be closed, but most in Maryland will be open. Some suburban institutions that usually are open Saturdays will be closed this Saturday, the Fourth of July.

Liquor stores: Liquor dispensaries in Virginia and Montgomery County will be open Friday but closed on Saturday. In Prince George's County and the District of Columbia, liquor stores are not required to close on holidays.

Libraries: Libraries in Fairfax County and Fairfax City will be closed Friday, Saturday and Sunday. Libraries in Alexandria and Prince George's County will be open Friday but closed Saturday. In the District of Columbia, Montgomery County and Falls Church, all facilities will be closed Friday and Saturday. In Arlington, all libraries will be closed Saturday. Only the central library in Arlington will be open Friday.

Courts: All courts will be closed Friday.

Mail: There will be regular postal service Friday. On Saturday, all area postal windows will be closed and delivery service will e limited to Express Mail and Special Delivery. Street letter box collections will be made at times specified for a holiday schedule.

Refuse: In Maryland and Virginia, all city and county trash collections will be made Friday on normal schedules, except in Falls Church where regular Friday pickups will be made today. In Falls Church, no pickups will be made Friday. In the District of Columbia, regular Friday trash cllections will be made today.

Transportation: Metrorail and Metrobus will run on a Saturday schedule and nonrush hour fares will be in effect all day Friday. Metrorail service will operate Friday from 8 a.m. to midnight. Buses and trains will run on a regular Saturday schedule on that day, with extra express bus service from the suburbs to downtown on some routes beginning at 4 p.m. Free shuttle bus service between the Pentagon North Parking Lot and the Arlington Cemetery Metro station will begin at 8 a.m. Fares will be 50 cents for any bus or rail trip, with free transfers between bus rides and between rail and bus when a rail transfer is used. There will be a 50-cent charge for Metro service after the fireworks display Saturday night.

Traffic and Parking: Friday, regular weekday rushhour traffic regulations will not be in effect. However, payment in parking meters will be required. Regular Saturday parking and traffic regulations will be in effect on that day. Free parking will be available at the Pentagon North Parking lot and at the South Capitol Street Bridge. There will be no charge for parking Friday and Saturday at all Metro-operated lots.