List of lightships of the United States

This is a list of lightships of the United States, listing lightships operated by the United States government. The first US lightship was put in place off of Willoughby Spit in Chesapeake Bay, Virginia, in 1820. Lightships remained in service in the United States until March 29, 1985, when the last ship, the "Nantucket I", was decommissioned. During that period, lightships were operated by several branches of the government: by the Lighthouse Establishment from 1820 to 1852, the Lighthouse Board from 1852 to 1910, the Lighthouse Service from 1910 to 1939, and the Coast Guard from 1939 to 1985.
The naming conventions used for lightships are not consistent. Until 1867, there was no uniform method to refer to individual lightships. Lightships in that period generally took the name of the station that they served, but occasionally other names. These names were not permanently assigned to an individual vessel. Rather, whenever a lightship was moved to a new station she took on that name. That made identifying individual ships nearly impossible. Beginning in 1867, lightship numbers (hull numbers) were assigned to ships still in service. These numbers are the primary means of identifying individual lightships across her various stations. In 1938, the Lighthouse Service retroactively allocated letter codes to the unnumbered lightships based on their research of available records, although some ships may have been lost or misidentified. Even with the hull numbers, it is common to refer to a lightship by the name of the station it serves (or "Relief", if it is a relief ship) and a few, such as the "Nantucket I" and "Nantucket II" have been given individual names.