Service organizations and churches in the District are providing free Thanksgiving dinners for the needy and homeless today at more than a dozen places around the city. Several groups such as the Salvation Army and Martha's Table, which sponsors mobile soup kitchens, served their holiday meals earlier this week.

Today's largest single Thanksgiving dinner, with more than 1,000 meals, is expected to be served across from the White House in Lafayette Square by the Community for Creative Non-Violence.

The Council of Churches, which helps organize meals for the homeless and needy year-round, is providing U.S. Department of Agriculture staple foods and donations to help 11 local churches prepare Thanksgiving dinners. Church volunteers will be providing major portions of the meals, including home-baked pies, as well as serving them.

Free transportation is being provided by the D.C. Department of Human Services from homeless shelters and from other places for groups of five or more. For further information on church meals and transportation, call Rev. Rodney L. Young of the Council of Churches at 544-1201 or 544-1202. Community for Creative Non-Violence (CCNV), Lafayette Square, 3-5 p.m. Call 332-4332. So Others Might Eat (SOME), 71 O St. NW, 11:30 a.m. to 1 p.m. Call 797-8806.

Thanksgiving meals at the following locations will be served between noon and 3 p.m. Allen Chapel AME Church, 2495 Alabama Ave. SE. Calvary Baptist Church, 755 Eighth St. NW. Canaan Baptist Church, 16th and Newton streets NW. House of Imagene, 214 P St. NW. Mount Lebanon Baptist Church, 1219 New Jersey Ave. NW. Mount Olive Baptist Church, 1146 Sixth St. NE. Peoples United Church of Christ, 4704 13th St. NW. Progressive Baptist Church, 1201 F St. NE. Purity Baptist Church, 1325 Maryland Ave. NE. St. Stephen's and the Incarnation Church, 16th and Newton streets NW. Third Street Church of God, 1204 Third St. NW.