In suits commenced after June 20, 1874, against the District of Columbia, process may be served on the Mayor of the District of Columbia, until otherwise provided by law.
D.C. Code § 2-401
Service of process
June 20, 1874, 18 Stat. 117, ch. 337, § 2
Official source: D.C. Law Library (Council of the District of Columbia). Reproduced from public-domain District of Columbia statutes; confirm against the official source for the current text. Not legal advice.