Here’s a listing of U.S. states and the other states they touch, in order of the number of borders:

1

Maine

2

Florida, South Carolina, Washington

3

California, Connecticut, Delaware, Louisiana, New Hampshire, New Jersey, North Dakota, Rhode Island, Vermont

4

Alabama, Indiana, Kansas, Maryland, Mississippi, Montana, North Carolina, Oregon, Texas, Wisconsin

5

Arizona, Georgia, Massachusetts, Michigan, Minnesota, Nevada, New Mexico,  Ohio, Virginia,  West Virginia

6

Arkansas,  Idaho, Illinois, Iowa, Nebraska, New York, Oklahoma, Pennsylvania, South Dakota, Utah, Wyoming

7

Colorado, Kentucky

8

Missouri, Tennessee