| USN Type | Pennant # | Name | Shipbuilder | Location | Hull # | Disp. Tons | FY | Keel Laid | Launched | Delivered | Days on Ways | Days in Water | Total Days | Disposition |
| SS | 198 | Tambor | Electric Boat | Groton CT | 35 | 1938 | 16-Jan-39 | 20-Dec-39 | 3-Jun-40 | 338 | 166 | 504 | Scrapped 1960 | |
| SS | 199 | Tautog | Electric Boat | Groton CT | 36 | 1938 | 1-Mar-39 | 27-Jan-40 | 3-Jul-40 | 332 | 158 | 490 | Scrapped 1960 | |
| SS | 200 | Thresher | Electric Boat | Groton CT | 37 | 1938 | 27-Apr-39 | 27-Mar-40 | 21-Aug-40 | 335 | 147 | 482 | Scrapped 1948 | |
| SS | 201 | Triton | Portsmouth NSY | Kittery ME | 1938 | 5-Jul-39 | 25-Mar-40 | 15-Aug-40 | 264 | 143 | 407 | Sunk by Japanese destroyers 1943 | ||
| SS | 202 | Trout | Portsmouth NSY | Kittery ME | 1938 | 28-Aug-39 | 21-May-40 | 15-Nov-40 | 267 | 178 | 445 | Presumed sunk 1944 | ||
| SS | 203 | Tuna | Mare Island NSY | Vallejo CA | 1938 | 19-Jul-39 | 2-Oct-40 | 2-Jan-41 | 441 | 92 | 533 | Sunk as target 1948 | ||
| SS | 204 | Mackerel | Electric Boat | Groton CT | 38 | 1939 | 6-Jun-39 | 28-Sep-40 | 31-Mar-41 | 480 | 184 | 664 | Scrapped 1947 | |
| SS | 205 | Marlin | Portsmouth NSY | Kittery ME | 1939 | 23-May-40 | 29-Jan-41 | 1-Aug-41 | 251 | 184 | 435 | Scrapped 1946 | ||
| SS | 206 | Gar | Electric Boat | Groton CT | 39 | 1939 | 27-Dec-39 | 7-Nov-40 | 14-Apr-41 | 319 | 158 | 477 | Scrapped 1960 | |
| SS | 207 | Grampus | Electric Boat | Groton CT | 40 | 1939 | 14-Feb-40 | 23-Dec-40 | 23-May-41 | 312 | 151 | 463 | Sunk by Japanese destroyers in Blackett Strait 1943 | |
| SS | 208 | Grayback | Electric Boat | Groton CT | 41 | 1939 | 3-Apr-40 | 31-Jan-41 | 30-Jun-41 | 305 | 150 | 455 | Sunk by Japanese aircraft and gunfire in the East China Sea 1944 | |
| SS | 209 | Grayling | Portsmouth NSY | Kittery ME | 1939 | 15-Dec-39 | 4-Sep-40 | 1-Mar-41 | 264 | 178 | 442 | Sunk in the Philippines 1943 | ||
| SS | 210 | Grenadier | Portsmouth NSY | Kittery ME | 1939 | 1-Apr-40 | 29-Nov-40 | 1-May-41 | 242 | 153 | 395 | Bombed in the Indian Ocean and scuttled 1943 | ||
| SS | 211 | Gudgeon | Mare Island NSY | Vallejo CA | 1939 | 22-Nov-39 | 25-Jan-41 | 21-Apr-41 | 429 | 86 | 515 | Presumed sunk 1944 | ||
| SS | 212 | Gato | Electric Boat | Groton CT | 42 | 1940 | 5-Oct-40 | 21-Aug-41 | 31-Dec-41 | 320 | 132 | 452 | Scrapped 1960 | |
| SS | 213 | Greenling | Electric Boat | Groton CT | 43 | 1940 | 12-Nov-40 | 20-Sep-41 | 21-Jan-42 | 312 | 123 | 435 | Scrapped 1960 | |
| SS | 214 | Grouper | Electric Boat | Groton CT | 44 | 1940 | 28-Dec-40 | 27-Oct-41 | 12-Feb-42 | 303 | 108 | 411 | Scrapped 1970 | |
| SS | 215 | Growler | Electric Boat | Groton CT | 45 | 1940 | 10-Feb-41 | 22-Nov-41 | 20-Mar-42 | 285 | 118 | 403 | Presumed sunk 1944 | |
| SS | 216 | Grunion | Electric Boat |