The designation YP originally meant a yard patrol craft. The Navy created its initial fleet of YPs from about sixty Coast Guard boats no longer needed after the end of prohibition. This fleet grew to about 650 for WWII, mostly by the acquisition and conversion of private yachts and fishing vessels. After the war, all these boats were sold off and the YP became a training craft, primarily at the U.S. Naval Academy. The table below is more comprehensive, I think, than any you will find anywhere else, but it still has some gaps. If anyone can add to it or otherwise improve it, please send your info to timcolton@aol.com
| Type | # | Shipbuilder | Location | Ft. | Tons | Built | Disposition |
| YP | 1 | ||||||
| YP | 2 | Yarmouth ME | 35 | 10 | 1910 | Acquired 1917 as USS Relief, sold 1921 | |
| YP | 3 | W. E. Huff | New York NY | 36 | 9 | 1917 | Acquired 1917 as USS Sanda, destroyed 1942 |
| YP | 4 | 66 | Ex-Stephanotis, seized by USCG, CG 975, to USN 1933, sold 1946 | ||||
| YP | 5 | Mathis Yachts | Camden NJ | 75 | 37 | 1924 | Ex-CG 102, to USN 1933, accidentally torpedoed 1938 |
| YP | 6 | Kingston DD | Kingston NY | 75 | 37 | 1925 | Ex-CG 109, to USN 1933, to MARAD 1946 |
| YP | 7 | Lake Union DD | Seattle WA | 75 | 37 | 1925 | Ex-CG 272, to USN 1933, transferred 1947 |
| YP | 8 | Portsmouth NSY | Kittery ME | 75 | 37 | 1925 | Ex-CG 191, to USN 1933, sold 1947 |
| YP | 9 | Mathis Yachts | Camden NJ | 75 | 37 | 1925 | Ex-CG 105, to USN 1933, to MARAD 1946 |
| YP | 10 | Chance Marine | Annapolis MD | 75 | 37 | 1925 | Ex-CG 194, to USN 1933, sold 1941 |
| YP | 11 | Chance Marine | Annapolis MD | 75 | 37 | 1925 | Ex-CG 196, to USN 1933, sold 1944 |
| YP | 12 | Kingston DD | Kingston NY | 75 | 37 | 1925 | Ex-CG 204, to USN 1933, sold 1947 |
| YP | 13 | Defoe BW | Bay City MI | 75 | 37 | 1925 | Ex-CG 123, to USN 1933, sold 1941 |
| YP | 14 | Southern SY | Newport News VA | 75 | 37 | 1925 | Ex-CG 181, to USN 1933, to MARAD 1946 |
| YP | 15 | Dachel-Carter BW | Benton Harbor MI | 75 | 37 | 1925 | Ex-CG 149, to USN 1933, to MARAD 1946 |
| YP | 16 | Lake Union DD | Seattle WA | 75 | 37 | 1925 | Ex-CG 267, to USN 1933, burnt in Guam 1942 |
| YP | 17 | Lake Union DD | Seattle WA | 75 | 37 | 1925 | Ex-CG 275, to USN 1933, to MARAD 1946 |
| YP | 18 | Lake Union DD | Seattle WA | 75 | 37 | 1925 | Ex-CG 263, to USN 1933. disposed of 1938 |
| YP | 19 | Rice Bros. | East Boothbay ME | 75 | 37 | 1925 | Ex-CG 177, to USN 1933, to MARAD 1946 |
| YP | 20 | New York S L & E | Morris Heights NY | 75 | 37 | 1925 | Ex-CG 163, to USN 1933, to MARAD 1946 |
| YP | 21 | Chance Marine | Annapolis MD | 75 | 37 | 1925 | Ex-CG 199, to USN 1933, to MARAD 1946 |
| YP | 22 | Vinyard SB | Milford DE | 75 | 37 | 1925 | Ex-CG 221, to USN 1933, to MARAD 1946 |
| YP | 23 | Mathis Yachts | Camden NJ | 75 | 37 | 1925 | Ex-CG 286, to USN 1933, to MARAD 1946 |
| YP | 24 | Mathis Yachts | Camden NJ | 75 | 37 | 1925 | Ex-CG 106, to USN 1933, to MARAD 1946 |
| YP | 25 | Dachel-Carter BW | Benton Harbor MI | 75 | 37 | 1925 | Ex-CG 142, to USN 1933, to MARAD 1946 |
| YP | 26 | Gibbs Gas Engine | Jacksonville FL | 75 | 37 | 1925 | Ex-CG 252, to USN 1934, lost 1942 |
| YP | 27 | Gibbs Gas Engine | Jacksonville FL | 75 | 37 | 1925 | Ex-CG 301, to USN 1934, to MARAD 1946 |
| YP | 28 | Colonna's SY | Norfolk VA | 75 | 37 | 1925 | Ex-CG 225, to USN 1933, sold 1946 |
| YP | 29 | Rice Bros. | East Boothbay ME | 75 | 37 | 1925 | Ex-CG 116, to USN 1933, to MARAD 1946 |
| YP | 30 | Gibbs Gas Engine | Jacksonville FL | 75 | 37 | 1925 | Ex-CG 251, to USN 1934, destroyed 1937 |
| YP | 31 | New York S L & E | Morris Heights NY | 75 | 37 | 1925 | Ex-CG 167, to USN 1933, sold 1947 |
| YP | 32 | Kingston DD | Kingston NY | 75 | 37 | 1925 | Ex-CG 208, to USN 1933, to MARAD 1946 |
| YP | 33 | A. W. DeYoung | Alameda CA | 75 | 37 | 1925 | Ex-CG 253, to USN 1934, transferred 1945 |
| YP | 34 | A. W. DeYoung | Alameda CA | 75 | 37 | 1925 | Ex-CG 258, to USN 1934, to MARAD 1946 |
| YP | 35 | Vinyard SB | Milton DE | 75 | 37 | 1925 | Ex-CG 222, to USN 1934, to MARAD 1946 |
| YP | 36 | Mathis Yachts | Camden NJ | 75 | 37 | 1925 | Ex-CG 280, to USN 1934, to MARAD 1946 |
| YP | 37 | Lake Union DD | Seattle WA | 75 | 37 | 1925 | Ex-CG 273, to USN 1934, transferred 1945 |
| YP | 38 | Lake Union DD | Seattle WA | 75 | 37 | 1925 | Ex-CG 269, to USN 1934, to MARAD 1946 |
| YP | 39 | Lake Union DD | Seattle WA | 75 | 37 | 1925 | Ex-CG 276, to USN 1934, transferred 1945 |
| YP | 40 | Rice Bros. | East Boothbay ME | 75 | 37 | 1925 | Ex-CG 175, to USN 1934, to MARAD 1946 |
| YP | 41 | Defoe BW | Bay City MI | 100 | 210 | 1942 | Ex-USCGC Mahoning, to USN 1935, to MARAD 1946 |
| YP | 42 | Defoe BW | Bay City MI | 100 | 210 | 1942 | Ex-USCGC Gallatin, to USN 1935, sold 1946 as Orca, later Exploration |
| YP | 43 | Camden Anchor | Rockland ME | 1915 | Ex-Daraga, acquired 1917 as SP 43, sold 1921 | ||
| YP | 44 | 65 | Ex-CG 9267 (Winnie), to USN 1934, small boat 1946 | ||||
| YP | 45 | Crowninshield SB | Fall River MA | 75 | 37 | 1925 | Ex-CG 133, to USN 1934, to MARAD 1946 |
| YP | 46 | Dachel-Carter BW | Benton Harbor MI | 75 | 37 | 1925 | Ex-CG 146, to USN 1934, disposed of 1946 |
| YP | 47 | Soule Steel | Freeport ME | 75 | 37 | 1925 | Ex-CG 152, to USN 1934, in collision and sank 1943 |
| YP | 48 | Mathis Yachts | Camden NJ | 75 | 37 | 1925 | Ex-CG 103, to USN 1934, disposed of 1946 |
| YP | 49 | Southern SY | Newport News VA | 75 | 37 | 1925 | Ex-CG 182, to USN 1934, scrapped 1943 |
| YP | 50 | Mathis Yachts | Camden NJ | 75 | 37 | 1925 | Ex-CG 278, to USN 1934, sold 1940 |
| YP | 51 | A. W. DeYoung | Alameda CA | 75 | 37 | 1925 | Ex-CG 261, to USN 1934, disposed of 1938 |
| YP | 52 | New York S L & E | Morris Heights NY | 75 | 37 | 1925 | Ex-CG 160, to USN 1935, sold 1946 |
| YP | 53 | Mathis Yachts | Camden NJ | 75 | 37 | 1925 | Ex-CG 101, to USN 1934, disposed of 1936 |
| YP | 54 | New York S L & E | Morris Heights NY | 75 | 37 | 1925 | Ex-CG 168, to USN 1934, to MARAD 1946 |
| YP | 55 | New York S L & E | Morris Heights NY | 75 | 37 | 1925 | Ex-CG 169, to USN 1934, transferred 1945 |
| YP | 56 | Defoe BW | Bay City MI | 100 | 210 | 1942 | Ex-USCGC Naugatuck, to USN 1935, sold 1947 as Shamrock, later E. D. Smith, Sea Eagle |
| YP | 57 | Mathis Yachts | Camden NJ | 75 | 37 | 1925 | Ex-CG 112, to USN 1934, to MARAD 1946 |
| YP | 58 | Southern SY | Newport News VA | 75 | 37 | 1925 | Ex-CG 183, to USN 1934, transferred 1946 |
| YP | 59 | Kingston DD | Kingston NY | 75 | 37 | 1925 | Ex-CG 203, to USN 1934, to MARAD 1946 |
| YP | 60 | Kingston DD | Kingston NY | 75 | 37 | 1925 | Ex-CG 207, to USN 1934, to MARAD 1946 |
| YP | 61 | Defoe BW | Bay City MI | 100 | 210 | 1942 | Ex-USCGC Dallas, to USN 1935, sold 1946 |
| YP | 62 | Defoe BW | Bay City MI | 100 | 210 | 1942 | Ex-USCGC Corwin, to USN 1935, sold 1946 |
| YP | 63 | Defoe BW | Bay City MI | 100 | 210 | 1942 | Ex-USCGC Dexter, to USN 1935, sold 1947 as Kingfisher, later Jamaica, Trinidad, Buccaneer, reefed 2010 |
| YP | 64 | Defoe BW | Bay City MI | 100 | 210 | 1942 | Ex-USCGC Eagle, to USN 1935, sold 1946 |
| YP | 65 | 71 | Ex-USCGC Pronto, to USN 1936, sold 1941 | ||||
| YP | 66 | Luders Marine | Stamford CT | 67 | 1917 | Ex-C 252, to MARAD 1946 | |
| YP | 67 | Mathis Yachts | Camden NJ | 75 | 37 | 1925 | Ex-CG 100, to USN 1934, to MARAD 1946 |
| YP | 68 | Nock | E. Greenwich RI | 65 | 1911 | Ex-Psyche V, acquired 1936 as SP 9, transferred 1941 | |
| YP | 69 | Defoe BW | Bay City MI | 100 | 210 | 1942 | Ex-USCGC Patriot, to USN 1935, to MARAD 1946 |
| YP | 70 | George S. Lawley | Neponset MA | 101 | 1928 | Ex-Gypsy, acquired 1940, to MARAD 1945 | |
| YP | 71 | George S. Lawley | Neponset MA | 1929 | Ex-Intrepid, acquired 1940, PY 12 1940 | ||
| YP | 72 | Tacoma WA | 87 | 152 | 1940 | Ex-Cavalcade, acquired 1940, wrecked in Alaska 1943 | |
| YP | 73 | 90 | 78 | 1937 | Ex-Corsair, acquired 1940, wrecked in Alaska 1945 | ||
| YP | 74 | 78 | 69 | 1937 | Ex-Endeavor, acquired 1940, lost 1942 | ||
| YP | 75 | Consolidated SB | Morris Heights NY | 75 | 28 | 1929 | Ex-Kooyong III, acquired 1940, to MARAD 1946 |
| YP | 76 | 44 | 1926 | Ex-Now Listen, acquired 1940, small boat 1944 | |||
| YP | 77 | Consolidated SB | Morris Heights NY | 79 | 1931 | Ex-Pamnorm, acquired 1940 as PC 523, in collision and sank 1942 | |
| YP | 78 | Hutchison BW | Alexandria Bay NY | 75 | 51 | 1941 | |
| YP | 79 | Hutchison BW | Alexandria Bay NY | 75 | 51 | 1941 | |
| YP | 80 | Elscot Boat | City Island NY | 75 | 51 | 1941 | |
| YP | 81 | Elscot Boat | City Island NY | 75 | 51 | 1941 | |
| YP | 82 | Elscot Boat | City Island NY | 75 | 51 | 1941 | |
| YP | 83 | Tacoma WA | 78 | 130 | 1939 | Ex-Rio del Mar, acquired 1941, to MARAD 1944 | |
| YP | 84 | 77 | 130 | 1939 | Ex-Ketchikan, acquired 1941, to MARAD 1944 | ||
| YP | 85 | Western BB | Tacoma WA | 78 | 130 | 1939 | Ex-Nick C II, acquired 1941, to MARAD 1946 |
| YP | 86 | Martinolich SB | Tacoma WA | 80 | 130 | 1937 | Ex-Pacific Fisher, acquired 1941, to MARAD 1944 |
| YP | 87 | Seattle WA | 75 | 130 | 1937 | Ex-Valiant, acquired 1941, to MARAD 1946 | |
| YP | 88 | 78 | 130 | 1937 | Ex-Adventure, acquired 1941, wrecked in Alaska 1943 | ||
| YP | 89 | Seattle WA | 74 | 130 | 1937 | Ex-Challenger, acquired 1941, to MARAD 1946 | |
| YP | 90 | 74 | 1937 | Ex-Montara, acquired 1941, YF 1080 1944 | |||
| YP | 91 | George S. Lawley | Neponset MA | 75 | 1928 | Ex-Lucivee, acquired 1941, to MARAD 1946 | |
| YP | 92 | Tacoma WA | 78 | 130 | 1938 | Ex-Helen B, acquired 1941, to MARAD 1946 | |
| YP | 93 (I) | Matthews Boats | Port Clinton OH | 70 | 1914 | Ex-Zumbrota, acquired 1917 as SP 93, YP 1920, sold 1927 | |
| YP | 93 (II) | Seattle WA | 76 | 130 | 1937 | Ex-Margaret F, acquired 1941, to MARAD 1946 | |
| YP | 94 | Western BB | Tacoma WA | 82 | 130 | 1937 | Ex-Western Chief, acquired 1941, wrecked 1945 |
| YP | 95 | 80 | 130 | 1937 | Ex-Nordic Pride, acquired 1941, wrecked 1944 | ||
| YP | 96 | Tacoma BB | Tacoma WA | 78 | 107 | 1922 | Ex-Midnight Sun, acquired 1922, to USC+GS as John F. Pratt 1941, to MARAD 1945 |
| YP | 97 | 66 | 1941 | Lost in the Phillipines 1942 | |||
| YP | 98 | 112 | 1929 | Ex-Caroline, acquired 1941, sold 1943 | |||
| YP | 99 | Elscot Boat | City Island NY | 75 | 55 | 1942 | To Peru 1958 |
| YP | 100 | Elscot Boat | City Island NY | 75 | Cancelled | ||
| YP | 101 | Elscot Boat | City Island NY | 75 | Cancelled | ||
| YP | 102 | Houghton WA | 77 | 81 | 1930 | Ex-Kuru, acquired 1941, to MARAD 1946 | |
| YP | 103 | Honolulu HI | 72 | 1938 | Ex-Nippon Maru, acquired 1941, to MARAD 1947 | ||
| YP | 104 | Consolidated SB | Morris Heights NY | 74 | 1926 | Ex-Marinette II, acquired 1941, to MARAD 1946 | |
| YP | 105 | Consolidated SB | Morris Heights NY | 85 | 1927 | Ex-Sybarita, acquired 1940 as PC 510, YP 1941, sold 1946 | |
| YP | 106 | Huckins Yachts | Jacksonville FL | 72 | 40 | 1941 | Ex-PT 69, YP 1941, to MARAD 1947 |
| YP | 107 | Higgins Ind. | New Orleans LA | 72 | 40 | 1941 | Ex-PT 70, YP 1941, to MARAD 1946 |
| YP | 108 | Wilmington BW | Wilmington CA | 69 | 51 | 1931 | Ex-Joyita, acquired 1941, to MARAD 1946 |
| YP | 109 | 107 | 86 | 1923 | Ex-Elvida, acquired 1941, to MARAD 1947 | ||
| YP | 110 | Philadelphia NSY | Philadelphia PA | 81 | 52 | 1940 | Ex-PT 8, equipment 1945 |
| YP | 111 | Fellows & Stewart | Wilmington CA | 56 | 1927 | Ex-Blue Moon, acquired 1941, to MARAD 1946 | |
| YP | 112 | 45 | 42 | 1929 | Ex-Pez Espada II, acquired 1941, to MARAD 1946 | ||
| YP | 113 | Sausalito CA | 1929 | Ex-Elogrier, acquired 1941, small boat 1942 | |||
| YP | 114 | Stephens Bros. | Stockton CA | 45 | 1940 | Ex-Adventuress, acquired 1941, to MARAD 1946 | |
| YP | 115 | 1930 | Ex-Kenny Lee, acquired 1941, small boat 1942 | ||||
| YP | 116 | 1928 | Ex-Balboa, acquired 1941, small boat 1942 | ||||
| YP | 117 | Peterson Builders | Sturgeon Bay WI | 59 | 1935 | Ex-Xanadu, acquired 1941, to MARAD 1946 | |
| YP | 118 | Oakland CA | 30 | 1930 | Ex-Skeeter, acquired 1941, small boat 1942 | ||
| YP | 119 | Lake Union DD | Seattle WA | 44 | 17 | 1929 | Ex-Pat Pending, acquired 1941, sold, still active in San Francisco |
| YP | 120 | Defoe BW | Bay City MI | 54 | 1928 | Ex-Borenna II, acquired 1941, returned to owner 1945 | |
| YP | 121 | Stephens Bros. | Stockton CA | 1929 | Ex-Bobanet, acquired 1941, small boat 1942 | ||
| YP | 122 | Harbor BB | Terminal Island CA | 1929 | Ex-Mary Kay, acquired 1941, small boat 1942 | ||
| YP | 123 | Malmo, Sweden | 1924 | Ex-Seamonger, acquired 1941, small boat 1942 | |||
| YP | 124 | Leung Yee | Manila PI | 1927 | Ex-Intrepid, acquired 1941, small boat 1942 | ||
| YP | 125 | 1926 | Ex-Spinster, acquired 1941, small boat 1942 | ||||
| YP | 126 | Stephens Bros. | Stockton CA | 1931 | Ex-Mabi II, acquired 1941, small boat 1942 | ||
| YP | 127 | Stephens Bros. | Stockton CA | 1929 | Ex-Bounty, acquired 1941, small boat 1942 | ||
| YP | 128 | 66 | 1935 | Ex-Bonnie Dundee III, acquired 1941, lost 1942 | |||
| YP | 129 | Kahn | Sausalito CA | 67 | 1922 | Ex-Felica, acquired 1941, to MARAD 1946 | |
| YP | 130 | Matthews Boats | Port Clinton OH | 1931 | Ex-Junema, acquired 1941, small boat 1942 | ||
| YP | 131 | Wilmington BW | Wilmington CA | 83 | 86 | 1929 | Ex-Sobre Las Olas, acquired 1941, to MARAD 1945 |
| YP | 132 | Twigg | San Francisco CA | 88 | 1926 | Ex-K'Thanga, acquired 1941, to MARAD 1945 | |
| YP | 133 | Stephens Bros. | Stockton CA | 52 | 1928 | Ex-Cherie, acquired 1941, to MARAD 1945 | |
| YP | 134 | Lake Union DD | Seattle WA | 1930 | Ex-Cherie II, acquired 1941, small boat 1942 | ||
| YP | 135 | Stephens Bros. | Stockton CA | 40 | 28 | 1931 | Ex-Armador II, acquired 1941, to MARAD 1945 |
| YP | 136 | Herreshoff Bros. | Bristol RI | 66 | 1919 | Ex-Memory, acquired 1941, to MARAD 1945 | |
| YP | 137 | Matthews Boats | Port Clinton OH | 57 | 1914 | Ex-Motap, acquired 1941 | |
| YP | 138 | 1924 | Ex-Sadye Lynn, acquired 1941, small boat 1945 | ||||
| YP | 139 | Skarsatra, Sweden | 1919 | Ex-Beautyrest, acquired 1941, small boat 1944 | |||
| YP |