Two candidates with well-known names, H. R. Crawford and Goldie Johnson, have announced their entries into the increasingly crowded field of Democrats seeking an at-large seat on the D.C. City Council.

Crawford was an assistant secretary of the U.S. Department of Housing and Urban Development during the Nixon and early Ford administrations. He is a property manager. Johnson is a president of the Metropolitan Washington Police Wives Association and a cosmetician.

In another development of citywide interest, Council Member David A. Clarke (D-Ward 1) took himself out of consideration for council chairman, a post in which he had expressed strong interest. He announced his candidacy for re-election to his ward seat, for which he already is opposed by Frank Smith Jr.

As candidates for at-large council seat, Crawford and Johnson joined two others - Betty Ann Kane and Lee S. Manor - who already have announced that they are seeking the post.

Although two at-large seats will be filled in the November general election, the city charter permits only one to go to a Democrat, which means the Sept. 12 primary will be decisive in that race.

Under the charter, the other at-large seat must go to a member of a minority party. Incumbent Hilda H. Mason of the Statehood Party is expected to announce her candidacy for re-election soon.

In Ward 6, which includes Capitol Hill, George Gurley announced his candidacy, challenging incumbent Democrat Nadine Winter.

One potentially strong challenger to Winter, John Warren, decided to keep his Ward 6 seat of the School Board, which has two [WORD ILLEGIBLE] run. Warren said he now plans to attempt to make an increased school budget and a replacement for old Eastern High School issues in the council campaign.