Cronin served as town commissioner of Aberdeen. He served as president of the board of commissioners of Aberdeen from 1950 to 1952 and 1955 to 1956. He served as counsel to the town board of commissioners for over 20 years. He served as counsel to Harford County's board of commissioners and counsel for Harford County's planning commission for 15 years. In 1951, Cronin was president of the Harford County Bar Association.
