1738 Routes
- Ottenheim -> Plainwell Michigan
- Otter Creek Florida -> Lickburg Kentucky
- Otter Creek Iowa -> Hidalgo Kentucky
- Otter Creek Iowa -> Waterloo Nebraska
- Otter Rock Oregon -> Lindsay Oklahoma
- Otterbein Indiana -> Babb Montana
- Otterbein Indiana -> Locker Texas
- Otterbein Indiana -> Shiloh Virginia
- Otterbein Indiana -> White Oak Virginia
- Otterville Missouri -> Dundalk Maryland
- Otterville Missouri -> Mer Rouge Louisiana
- Otto -> Brownington
- Otto -> Johnson Creek Wisconsin
- Otto -> Macdill Air Force Florida
- Otto Minnesota -> Jack Lee Island Florida
- Otto Minnesota -> Los Montoyas New Mexico
- Otto Minnesota -> North Collins New York
- Otto Minnesota -> Zachow Wisconsin
- Otto Missouri -> Robinson
- Otto North Carolina -> Ammie Kentucky
- Otto North Carolina -> Conway Florida
- Otto North Carolina -> Fullerville New York
- Otto North Carolina -> Pennville Pennsylvania
- Otto North Carolina -> Raeford North Carolina
- Otto Wyoming -> Citronelle Florida
- Otto Wyoming -> Turquoise Beach Florida
- Ottokee Ohio -> Birdie Georgia
- Ottosen Iowa -> Granger Iowa
- Ottosen Iowa -> Tuscarora Pennsylvania
- Ottoville Ohio -> Brookland Arkansas
- Ottoville Ohio -> Dycusburg Kentucky
- Ottoville Ohio -> Hoytville Ohio
- Ottoville Ohio -> Kirkwood
- Ottsville Pennsylvania -> Blanket Texas
- Ottumwa Iowa -> Arispe Iowa
- Ottumwa Iowa -> Davenport New York
- Ottumwa Iowa -> Rhodes Iowa
- Ottumwa Iowa -> Skokomish Washington
- Ottusville -> Red Oaks Mill New York
- Ottville Illinois -> Black River New York
- Otway Ohio -> Kleinfeltersville Pennsylvania
- Oulu Wisconsin -> Cape Falcon Oregon
- Oulu Wisconsin -> Torrance California
- Ouray Colorado -> Taft Arkansas
- Outing Minnesota -> Campton Kentucky
- Outing Minnesota -> Gates Oregon
- Outing Minnesota -> Hitson Texas
- Ova Kentucky -> Bobs Fork Kentucky
- Ovalo Texas -> Milner
- Ovalo Texas -> Rushford Village Minnesota
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