EntityQ94877· pop 19· linked from 445 articlesInterstate 81Sign in to saveInterstate Highway in the United StatesConnectionsInterstate Highway SystemEntityInterstate 29EntityInterstate 73EntityInterstate 84EntityFederal Highway AdministrationEntitylist of auxiliary Interstate HighwaysEntityUnited StatesCountryCanadaCountryWashington, D.C.EntityNew YorkEntitycapital cityEntityPennsylvaniaEntityVirginiaEntityOttawaEntityMarylandEntityTennesseeEntityTorontoEntityWest VirginiaEntityMontrealEntityOntarioEntityCategoriesInfobox road instances in the United StatesInterstate 81Interstate Highway System