Sikkim (located in east India between Nepal and Bhutan) has a border only with the state of West Bengal.
Goa shares its border with only one other Indian state, which is Karnataka.
Maine, it shares a border with Vermont.
There is no Australian state which shares a border with all other states. No state except for Victoria shares a land border with Tasmania. South Australia shares a border with all mainland states and the Northern Territory.
Pennsylvania
Kentucky and Colorado.
Kentucky.
Arunachal Pradesh. It shares its international border with Bhutan, China and Myanmar.
sikkim
The state that shares its northern border with Connecticut is Massachusetts.
Only Alaska and Hawaii do not share borders with other US states. Every other state shares a border with at least one other state.
Oklahoma shares most of Texas's northern border.
Maine shares a border only with New Hampshire.