Upon returning to the United States in December 1918, "Conyngham" underwent repairs at the Boston Navy Yard. She remained there in reduced commission through 1921, with only brief episodes of activity. After returning to active service for about a year, she was decommissioned in June 1922. In June 1924, "Conyngham" was transferred to the United States Coast Guard to help enforce Prohibition as a part of the "Rum Patrol". She operated under the name USCGC "Conyngham" (CG-2) until 1933, when she was returned to the Navy. Later that year, the ship was renamed "DD-58" to free the name "Conyngham" for another destroyer. She was sold for scrap in August 1934.