PT-20 Class – PTs 20-68 – Built by Elco in Bayonne, New Jersey. The boats of this class were based on the PT-10 Class, but had their hulls lengthened to seventy-seven feet. They were completed from June of 1941 to January 1942. This class was separated into two sub-series, PTs 20-44 and PTs 45-68. Not all of this class was used by the USN, some were modified for service for the British Royal Navy.
PT-71 Class – PTs 71-94 – Built by Higgins Industries in New Orleans, Louisiana. They were seventy-eight feet long. These boats were completed from July 1942 to December 1942. This design had several sub-classes in the 200 numbered series, 300 series, 400 series, 500 series, 600 series and 700 series (the 600 and 700 series did not see action). Not all of this class was used by the USN. Some of the Higgins designed PTs were used by the British and Soviet Navies.
PT-95 Class – PTs 95-102 – Built by the Huckins Yacht Company in Jacksonville, Florida. They were seventy-eight feet long. They were completed from July 1942 to November 1942. A second and final batch of this design was built from February 1943 to September 1943. This second batch consisted of PTs 255-264. None of the Huckins designed boats ever saw combat. They served as training boats and also patrolled the waters of the Hawaiian Sea Frontier and the Panamanian Sea Frontier.
PT-103 Class – PTs 103-196 – Built by Elco in Bayonne, New Jersey. They were eighty feet long. The class and all of its sub-classes were built from July 1942 until the end of the Second World War. Like the Higgins boats, the eighty foot Elco had series runs in the 200, 300, 400, 500, 600 and 700 series. Some of the 600 and all of the 700 series boats did not see combat. Some of the 700 series boats were completed for the Soviet Navy.
Four foreign-built PT boats saw action with the USN. These were the seventy foot Scott-Paine MTBs built in Canada for the Dutch Navy, but when the Dutch fell, the order was taken over by the USN in a reverse lend-lease agreement. These were PTs 368-371. Three of these boats were destroyed in action.
U.S. boat yards built a number of Vosper designed MTBs for the British Royal Navy, Royal Indian Navy and the Soviet Navy.