List of patrol vessels of the United States Navy

This is a list of patrol vessels of the United States Navy.
PC, submarine chaser.
These submarine chasers were 173 feet long and used the PC designation. The large missing sections of numbers in designation for the most part come from sharing the same number set as the other much smaller 110-foot submarine chasers that used the SC designation.
"497-507 used by SC submarine chasers"
"511 to 522 used by SC submarine chasers"
"524-539 used by SC submarine chasers"
PE, Eagle-class patrol craft.
Of 112 Eagle class patrol craft planned 60 of these World War I era ships were completed, being given numbers from 1 to 60. Only three were commissioned prior to the Armistice which ended World War I and only eight saw service in World War II of which "PE-56" was sunk by a U-boat.
PE-61 through PE-112 were cancelled on November 30, 1918.
PE-5, PE-15, PE-25, PE-45, PE-65, PE-75, PE-86, PE-95, PE-105, and PE-112 were allotted for transfer to Italy, though this plan was cancelled and none were ever delivered.
PR, river gunboat.
All built in Shanghai to serve on the Yangtze Patrol.
SC, submarine chaser.
These submarine chasers were 110 feet long and used the SC designation. The large missing sections of numbers in designation for the most part come from sharing the same number set as the other bigger 173 foot subchasers that used the PC designation.
SC 497 class.
Mainly SC-497 to 775, SC-977 to 1076, SC-1267 to 1367, SC-1474 to 1626. Also several were modified to be SCC's a command versions.
"509 and 510 used by PC submarine chasers"
"523 used by PC submarine chaser"
"776-976 used by PC submarine chasers"
"1077-1265 used by PC submarine chasers"
SC-1466 to SC-1473.
These were British design Fairmile B motor launches built in Canada and loaned to US.
SC-1474 to SC-1626.
"(incomplete listing)"
World War I section patrol (SP) and identification number (ID) series.
Incomplete listing of civilian boats and ships commissioned during World War I for use as section patrol (SP) craft and civilian cargo ships, tankers, transports, etc., commissioned for U.S. Navy use during World War and given non-"SP" identification numbers (ID) in the "SP" numbering series.