Is it possible for someone to give me an approximate area covered by the DC zip code of 20010. The SSDI lists my father's death (William Buckley) as December 1967, zip code 20010. No other info. Have written to vital records 3 times for death certificate, but nothing available; also have written the majority of funeral homes and cemeteries in the area with no success. Having the zip code area might give me some small clue. Thanks. Marianne