Mast tracks current federal flag orders and known District of Columbia local orders so residents, public buildings, schools, businesses, and local websites can quickly check whether flags should be at half-staff or full-staff today.
The District of Columbia source in Mast is DC Office of the Secretary / os.dc.gov, categorized as Official District Flag Status Page.
District of Columbia has an official source Mast can check for current flag status. Historical District of Columbia notices may be limited when the official source does not expose dated archives.
The DC Office of the Secretary publishes a current Flag Status page for the U.S. and DC flags. The District flag protocol manual documents that only the Mayor of the District of Columbia can order the District flag to half-staff, and that presidential U.S. flag orders are supplemented for the District flag.