Amarillo is also the northern terminus for I - 27 , of which less than one mile ( ~ 1.6 km ) of it is located in Potter County .
Amarillo is served by two interstate highways : Interstate 27 and Interstate 40 .
Amarillo is also the northern Amarillo for Interstate 27     , of which less than one mile ( ~ 1.6 km ) of Amarillo is located in Potter County .
Amarillo is served by two interstate highways : Interstate 27 and Interstate 40 .