Here is a list of gasoline stations in the District of Columbia that a city energy official said will sell gasoline between 7 p.m. and 9 p.m. today, Tuesday, Thursday and Friday:

Pennsylvania Avenue Gulf, 2300 Pennsylvania Ave., Se; Hillcrest Servicenter, 5120 Georgia Ave., Nw; Jamison's Sunoco, 1253 9th St., Nw; Melby's Gulf, 3124 Mount Pleasant St., Nw; MacArthur's Service Center Amoco Station, 5101 MacArthur Blvd., NW; Parkwat Shell, 1944 Bladensuburg Rd., Ne; and Webb's Exxon Servicenter, 4100 Hunt Pl., NE.

The following stations in the District will be open from 8 a.m. to noon Wednesday, the Fourth of July:

Jack's Exxon, 801 H St., Nw; Citadel Mobil, 1631 Kalorama Rd., Nw; Key Bridge Mobil, 3601 M St., Nw; Connecticut Avenue Amoco, 5001 Connecticut Ave., NW; Davis Exxon, 4501 14th St., NW; Fort Dupont Shell, 4107 Alabama Ave., SE; Pennsylvania Ave., Amoco, 2500 Pennsylvania Ave., SE; Scott's Mobil, 4501 Bowen Rd., SE; Mason Brothers Exxon, 4854 Deane [Burroughs] Ave., NE; and Ward's Amoco, 400 Rhode Island Ave., NE.

TELEPHONE HELP

Following are telephone number of aagencies providing information to deal with gasoline emergencies:

District of Columbia "hot line": 628-3181. An official said it will be staffed from 9 a.m. to 8 p.m.

Prince George's County "hot line": 779-1151. An official said it will be staffed around the clock.

American Automobile Association: 222-5000. Officials said AAA members may obtain small quantities of gas or be towed to a nearby station if they are stranded.

NEW FLAG SYSTEM

Washington area service stations have been asked to begin displaying special flags today, noting the availability of gasoline.

A green flag means leaded and unleaded gasoline are available.

A yellow flag means only leaded gasoline can be purchased.

A red flag means a station's pumps are closed.

Gas station owners in the District can pick up flags at the Munsey Building, 1329 E.St., NW, Room 1258.