Both Hawaii and Alaska do not share borders with any other states.
Hawaii
Russia
Hawaii
The US shares borders with two other states (countries) - Canada and Mexico
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.
Tennessee shares borders with 8 other states: Alabama, Arkansas, Georgia, Kentucky, Mississippi, Missouri, North Carolina, and Virginia.
Texas, Texas shares it's border with 4 states: New Mexico, Oklahoma, Arkansas, and Louisiana. California borders 3 states: Oregon, Nevada, and Arizona. Florida borders 2 states: Alabama and Georgia.
Missouri and Tennessee are the only states to border eight others.
Maine does not border at least 4 other states. It only shares borders with New Hampshire to the west.
Michigan shares a border with three states (Wisconsin, Indiana, and Ohio).In addition to these land borders, Michigan also shares water borders with the states of Illinois and Minnesota.Nebraska shares a border with 6 states (Colorado, Kansas, Missouri, Iowa, South Dakota, and Wyoming).As does Arkansas (Texas, Louisiana, Mississippi, Tennessee, Missouri, and Oklahoma).
Tennessee and Missouri. Tennessee shares borders with Kentucky, Virginia, North Carolina, Georgia, Alabama, Mississippi, Arkansas, and Missouri. Missouri shares borders with Iowa, Illinois, Kentucky, Tennessee, Arkansas, Oklahoma, Kansas, and Nebraska.