1738 Routes
- Oklaunion Texas -> Quitman Canyon Texas
- Oklaunion Texas -> Waskom Texas
- Oklee Minnesota -> St. Mary Missouri
- Okmulgee Oklahoma -> Coffman Missouri
- Okmulgee Oklahoma -> Pearce Alabama
- Okobojo Creek Rec Area South Dakota -> Caledonia Ohio
- Okobojo Creek Rec Area South Dakota -> Glad Valley South Dakota
- Okobojo Creek Rec Area South Dakota -> Parade South Dakota
- Okolona -> Georgetown
- Okolona -> Wefanie Georgia
- Okolona Arkansas -> Archer Iowa
- Okolona Mississippi -> Webb Mississippi
- Okolona Tennesse -> Deerlodge Tennesse
- Okreek South Dakota -> New Athens Illinois
- Oktaha Oklahoma -> Luxemburg Iowa
- Ola Arkansas -> Mackville
- Ola Arkansas -> Savanna Illinois
- Ola Arkansas -> Urbanna Virginia
- Ola Arkansas -> West Baldwin Maine
- Ola Arkansas -> Woodacre California
- Ola Georgia -> Garland Iowa
- Ola Georgia -> Greenfield Ohio
- Ola Georgia -> Skimino Virginia
- Olancha California -> Audubon Iowa
- Olanta South Carolina -> Adams Run South Carolina
- Olanta South Carolina -> Aiken South Carolina
- Olanta South Carolina -> Albee South Dakota
- Olanta South Carolina -> Anchorage
- Olanta South Carolina -> Bangor Kentucky
- Olanta South Carolina -> Chestnut Kentucky
- Olanta South Carolina -> Davis City Iowa
- Olanta South Carolina -> Forreston Illinois
- Olanta South Carolina -> Piermont New Hampshire
- Olanta South Carolina -> Rock Springs Alabama
- Olathe Colorado -> Jonesville Vermont
- Olathe Kansas -> Rice Lake Wisconsin
- Olaton -> Clearlake Oaks California
- Olaton -> Matanzas
- Old Adobe Plaza Shopping Center Temecula -> Escondido California 92025
- Old Appleton Missouri -> Shattuc Illinois
- Old Balltown Iowa -> Port Crane New York
- Old Brookville New York -> Brownsville Oregon
- Old Cordesville South Carolina -> Gildford Montana
- Old Cordesville South Carolina -> Mcclelland Iowa
- Old Cordesville South Carolina -> Truman Pennsylvania
- Old Cumberland Tennesse -> Hartley Iowa
- Old Faithful Wyoming -> Chester Vermont
- Old Faithful Wyoming -> Niobrara Nebraska
- Old Field New York -> Amistad New Mexico
- Old Flat Lick Kentucky -> Oblong Illinois
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