US Highways Route - US31
| Route | From | To | Miles | States passed through | Replaced by | Notes |
| US 31 | (Allenville, MI +) Mackinaw City, MI | Spanish Fort, AL (Mobile, AL) | 1280 (1358) | MI IN KY TN AL | US 33 Alt US 31 IN-11 US 50 US 31W IN-311 US 31W KY-218 US 31E AL-231 CR-4 AL-185 US 90 | Since 1926; /E//W/ S trunc 1991 |
| US 131 | (Harbor Springs, MI) Petoskey, MI | Middlebury, IN + (Mottville, MI -) | 271 (294) | MI IN | MI-119 MI-72 US 12 MI-103 | Since 1926; S exten 1937; S trunc White Pigeon, MI 1960; S exten 1980 |
| US 231 | St. John, IN + | Panama City, FL | 912 (932) | IN KY TN AL FL | AL-123 FL-73 | Since 1926; N exten 1952; S trunc near Cottondale, FL & exten 1935 |
| (US 331) [I] | (Flomaton, AL) | (Pensacola, FL) | (45) | (AL) (FL) | US 29 | Exist 1926-1936 |
| US 331 [II] | Montgomery, AL | Santa Rosa Beach, FL + | 155 (156) | AL FL | AL-227 US 80 / US 82 | Since 1953; N trunc 1990 |
| US 431 | Owensboro, KY | Dothan, AL | 556 (582) | KY TN AL | AL-10 CR-99 | Since 1954 |
| US 33 | (Hagar Shores, MI) Dunlap, IN + | Richmond, VA | 709 (766) | (MI) IN OH WV VA | MI-63 MI-51 IN-933 OH-13 | Since 1935; Was signed N-WEST / S-EAST in OH; N trunc Niles, MI 1986; South Bend, IN 1997; Curr 1999 |
| US 35 | Michigan City, IN | St. Albans, WV (Charleston, WV) | 424 (439) | IN OH WV | IN-435 WV-62 | Since 1934 |
| (US 37) | (Sellersburg, IN) | (Chattanooga, TN) | (204) | (IN) (KY) (TN) | US 31 US 31E KY-90 TN-28 US 127 TN-283 TN-27 | Exist 1934-1935; Still on some maps 1944 |
| >US 39< | Nill | Nill | Nill | Nill | Nill | Not Assigned |
U.S. Highways
| US 1 | US 11 | US 21 | US 31 | US 41 |
| US 51 | US 61 | US 71 | US 81 | US 91 |
| US 2[I] | US 10 [I] | US 20 [I] | US 30 | US 40 |
| US 50 | US 60 | US 70 | US 80 | US 90 |