The U.S. Coast and Geodetic Survey determined the latitude, longitude and elevation of the Zero Milestone. Authorized by Act of Congress, June 5, 1920. Dedicated June 4, 1923.
Point for the measurement of distances from Washington on . . . — — Map (db m32486) HM
The stone marking the Washington Meridian was formerly located 52 feet, nine inches west of this tablet which was presented by the Army and Navy Chapter, Daughters of the American Revolution. — — Map (db m82518) HM