720 Routes
- Iowa Louisiana -> Farnsworth Pennsylvania
- Iowa Louisiana -> Tina Missouri
- Iowa Park Texas -> San Fidel New Mexico
- Ipava Illinois -> Tunstall Virginia
- Ipswich Massachusetts -> Texico New Mexico
- Ipswich South Dakota -> Jeremiah Kentucky
- Ira Vermont -> Laurel Indiana
- Irasburg Vermont -> Vocation Alabama
- Irby Texas -> Whelen Springs Arkansas
- Irby Virginia -> Bronson Florida
- Irby Virginia -> Kennedyville Maryland
- Iredell Texas -> Cavett Ohio
- Ireland -> Claude Texas
- Ireland -> Leoni Michigan
- Ireton Iowa -> Kiron Iowa
- Ireton Iowa -> Mckees Crossroads
- Ireton Iowa -> Waukon Jct Iowa
- Irish Lake Indiana -> Fort Mitchell Kentucky
- Irish Lake Indiana -> Moline Quad-city Airport Illinois
- Irma Wisconsin -> Caruthers California
- Irma Wisconsin -> Salem Connecti
- Irmo South Carolina -> Optima Oklahoma
- Irmo South Carolina -> Raleigh North Carolina
- Iron City Georgia -> Briarwood Beach Ohio
- Iron City Tennesse -> North Olmsted Ohio
- Iron Gate Virginia -> Pyote Texas
- Iron Gates Missouri -> Wrights Corner Virginia
- Iron Junction Minnesota -> Lone Star Kansas
- Iron Lightning South Dakota -> Central City Pennsylvania
- Iron Lightning South Dakota -> Myrtle Grove Florida
- Iron Mountain Michigan -> Green Peter Reservoir Oregon
- Iron Mountain Michigan -> Milltown Florida
- Iron Mountain Missouri -> Moselle Missouri
- Iron Mountain Missouri -> Parnell Missouri
- Iron Ridge Wisconsin -> Carbon Iowa
- Iron Ridge Wisconsin -> Grand Canyon Village Arizona
- Iron River Michigan -> Cedar Run Pennsylvania
- Iron Springs Arizona -> Aetna Kansas
- Iron Springs Arizona -> Central Point Virginia
- Iron Springs Arizona -> Tonopah Arizona
- Iron Springs Arizona -> White Cone Arizona
- Irona New York -> Chisholm Minnesota
- Irona New York -> Ridgecrest California
- Irondale Alabama -> Avena Illinois
- Irondale Georgia -> Portage Wisconsin
- Irondale Missouri -> Piedmont Missouri
- Irondale Ohio -> Houston Illinois
- Irondale Ohio -> Manchester New York
- Irondequoit New York -> Gamber Maryland
- Irongate Georgia -> Coin Iowa
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