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| Route No. 20- | From Boston, Massachusetts, to Springfield, Pittsfield, Albany, New York, Auburn, Batavia, Buffalo, Erie, Pennsylvania, Cleveland, Ohio, Maumee, South Bend, Indiana, Chicago, Illinois, Rockford, Dubuque, Iowa, Waterloo, Webster City, Sioux City, O'Neill, Nebraska, Chadron, Lusk, Wyoming, Casper, Shoshoni, Greybull, Yellowstone National Park, Idaho Falls, Idaho, Pocatello, Twin Falls, Boise, Payette, Pendleton, Oregon, Umatilla, The Dalles, Portland, Astoria. |
| 21- | From Cleveland, Ohio, to Massillon, Cambridge, Parkersburg, West Virginia, Charleston, Princeton, Wytheville, Virginia, Sparta, North Carolina, Statesville, Salisbury, Charlotte, Chester, South Carolina, Columbia, Branchville, Yemassee, Savannah, Georgia, Darien, Kingsland, Jacksonville, Florida. |
| 22- | From Elizabeth, New Jersey, Phillipsburg, Reading, Pennsylvania, Harrisburg, Clarks Ferry, Bellefonte, Dubois, New Castle, Youngstown, Ohio, Cleveland. |
| 23- | From Mackinac, Michigan, to Alpena, Bay City, Flint, Ypsilanti, Toledo, Ohio, Marion, Columbus, Chillicothe, Portsmouth. |
| 24- | From Pontiac, Michigan, to Flat Rock, Toledo, Ohio, Defiance, Ft. Wayne, Indiana, Peru, Kentland, Gilman, Illinois, Peoria, Rushville, Quincy, Palmyra, Missouri, Monroe. |
| 25- | From Toledo, Ohio, to Findlay, Dayton, Cincinnati, Lexington, Kentucky, Richmond, Corbin, Knoxville, Tennessee, Asheville, North Carolina, Greenville, South Carolina, Greenwood, Augusta, Georgia. |
| 26- | From Ogallala, Nebraska, to Bridgeport, Torrington, Wyoming, the Federal aid road north of Wheatland. |
| 27- | From Cheboygan, Michigan, to Grayling, Lansing, Marshall, Ft. Wayne, Indiana, Richmond, Cincinnati. |
| 28- | From Ontario, Oregon, to Dayville, Prineville, Eugene, Florence. |
