conterminous

(s) connecting without a break; within a common boundary
- the 48 conterminous states
- the contiguous 48 states
contiguous,
(s) having a common boundary or edge; abutting; touching
- Rhode Island has two bordering states; Massachusetts and Conncecticut
- the side of Germany conterminous with France
- Utah and the contiguous state of Idaho
- neighboring cities
neighboring, adjacent, contiguous,
(s) being of equal extent or scope or duration coextensive, coterminous,

contiguous neighboring adjacent coextensive coterminous