By the time she was completed, the war for which Demologos had been built had ended. She saw only one day of active service, when she carried President James Monroe on a tour of New York Harbor. A two-masted lateen rig was added by the orders of her first commander, Captain David Porter. In 1821 her armament and machinery were removed. The remainder of her career was spent laid up in reserve; after 1825 she served as the floating barracks for Brooklyn Navy Yard. She came to an end on 4 June 1829 in a gunpowder explosion.