| Two States | Border State |
| California / Colorado | |
| Florida / Alabama | |
| Arizona / Kansas | |
| California / New Mexico | |
| Arizona / Nebraska | |
| Arizona / California | |
| Arkansas / Colorado | |
| Florida / Mississippi | |
| Arkansas / Iowa | |
| Arkansas / Illinois | |
| Colorado / Iowa | |
| Alabama / Louisiana | |
| Louisiana / Missouri | |
| Mississippi / Louisiana | |
| Alabama / South Carolina | |
| Florida / North Carolina | |
| Iowa / Indiana | |
| Arkansas / Georgia | |
| Arkansas / Nebraska | |
| Mississippi / Oklahoma | |
| Connecticut / New Hampshire | |
| Nebraska / New Mexico | |
| | Two States | Border State |
| Connecticut / New Jersey | |
| Florida / South Carolina | |
| Oregon / California | |
| Alabama / Kentucky | |
| Delaware / Maryland | |
| Louisiana / Texas | |
| Connecticut / Pennsylvania | |
| Kansas / Illinois | |
| Alabama / Missouri | |
| Alabama / Mississippi | |
| Delaware / Ohio | |
| Minnesota / Missouri | |
| Arkansas / North Carolina | |
| Missouri / Michigan | |
| Indiana / Minnesota | |
| Kansas / Utah | |
| Kansas / Kentucky | |
| Arizona / Texas | |
| Idaho / North Dakota | |
| Montana / Nevada | |
| Illinois / South Dakota | |
| Iowa / Oklahoma | |
| | Two States | Border State |
| Ohio / Michigan | |
| Illinois / Oklahoma | |
| Montana / Oregon | |
| Georgia / Kentucky | |
| Kentucky / Nebraska | |
| Delaware / Virginia | |
| Missouri / Ohio | |
| Kentucky / Oklahoma | |
| Colorado / Montana | |
| North Carolina / South Carolina | |
| Massachusetts / Maine | |
| Indiana / Pennsylvania | |
| Michigan / North Dakota | |
| Georgia / Missouri | |
| Indiana / Tennessee | |
| California / Washington | |
| Iowa / Montana | |
| Minnesota / Ohio | |
| New Jersey / Massachusetts | |
| Wyoming / Oklahoma | |
| Texas / Tennessee | |
| Tennessee / Iowa | |
| | Two States | Border State |
| Virginia / Illinois | |
| New Mexico / Missouri | |
| Virginia / Indiana | |
| Pennsylvania / Massachusetts | |
| Virginia / Alabama | |
| New York / Maryland | |
| Virginia / Arkansas | |
| Wisconsin / Kentucky | |
| West Virginia / Illinois | |
| Pennsylvania / Michigan | |
| South Dakota / Kansas | |
| New York / Pennsylvania | |
| New Mexico / Idaho | |
| Tennessee / Kansas | |
| Mississippi / Kentucky | |
| Rhode Island / New Hampshire | |
| Ohio / New Jersey | |
| Washington / Montana | |
| South Dakota / Michigan | |
| Ohio / New York | |
| Montana / Idaho | |
| Wisconsin / Nebraska | |
| | Two States | Border State |
| Minnesota / North Dakota | |
| North Dakota / Montana | |
| Nebraska / Idaho | |
| New Mexico / Louisiana | |
| Rhode Island / New Jersey | |
| Tennessee / Ohio | |
| Texas / Kansas | |
| Nebraska / North Dakota | |
| Oregon / Washington | |
| North Carolina / Missouri | |
| Tennessee / Nebraska | |
| North Carolina / Mississippi | |
| Wyoming / Oregon | |
| West Virginia / Missouri | |
| Rhode Island / Pennsylvania | |
| North Carolina / Maryland | |
| New Hampshire / Vermont | |
| Michigan / Minnesota | |
| Vermont / Maine | |
| Texas / New Mexico | |
| Wisconsin / North Dakota | |
| Wyoming / Missouri | |
| | Two States | Border State |
| Vermont / New Jersey | |
| Wisconsin / Ohio | |
| West Virginia / Michigan | |
| Vermont / Pennsylvania | |
| Utah / Washington | |
| West Virginia / New Jersey | |
| West Virginia / New York | |
| Pennsylvania / Ohio | |
| South Carolina / Virginia | |
| Tennessee / Maryland | |
| Wyoming / Washington | |
| Virginia / Mississippi | |
| Wyoming / Minnesota | |
| Utah / Texas | |
| Virginia / North Carolina | |
| Maryland / Virginia | |
| West Virginia / North Carolina | |
| Utah / South Dakota | |
| California / Colorado | |
| Florida / Alabama | |
| Arizona / Kansas | |
| California / New Mexico | |
| Arizona / Nebraska | |
| Arizona / California | |
| Arkansas / Colorado | |
| Florida / Mississippi | |
| Arkansas / Iowa | |
| Arkansas / Illinois | |
| Colorado / Iowa | |
| Alabama / Louisiana | |
| Louisiana / Missouri | |
| Mississippi / Louisiana | |
| Alabama / South Carolina | |
| Florida / North Carolina | |
| Iowa / Indiana | |
| Arkansas / Georgia | |
| Arkansas / Nebraska | |
| Mississippi / Oklahoma | |
| Connecticut / New Hampshire | |
| Nebraska / New Mexico | |
| Connecticut / New Jersey | |
| Florida / South Carolina | |
| Oregon / California | |
| Alabama / Kentucky | |
| Delaware / Maryland | |
| Louisiana / Texas | |
| Connecticut / Pennsylvania | |
| Kansas / Illinois | |
| Alabama / Missouri | |
| Alabama / Mississippi | |
| Delaware / Ohio | |
| Minnesota / Missouri | |
| Arkansas / North Carolina | |
| Missouri / Michigan | |
| Indiana / Minnesota | |
| Kansas / Utah | |
| Kansas / Kentucky | |
| Arizona / Texas | |
| Idaho / North Dakota | |
| Montana / Nevada | |
| Illinois / South Dakota | |
| Iowa / Oklahoma | |
| Ohio / Michigan | |
| Illinois / Oklahoma | |
| Montana / Oregon | |
| Georgia / Kentucky | |
| Kentucky / Nebraska | |
| Delaware / Virginia | |
| Missouri / Ohio | |
| Kentucky / Oklahoma | |
| Colorado / Montana | |
| North Carolina / South Carolina | |
| Massachusetts / Maine | |
| Indiana / Pennsylvania | |
| Michigan / North Dakota | |
| Georgia / Missouri | |
| Indiana / Tennessee | |
| California / Washington | |
| Iowa / Montana | |
| Minnesota / Ohio | |
| New Jersey / Massachusetts | |
| Wyoming / Oklahoma | |
| Texas / Tennessee | |
| Tennessee / Iowa | |
| Virginia / Illinois | |
| New Mexico / Missouri | |
| Virginia / Indiana | |
| Pennsylvania / Massachusetts | |
| Virginia / Alabama | |
| New York / Maryland | |
| Virginia / Arkansas | |
| Wisconsin / Kentucky | |
| West Virginia / Illinois | |
| Pennsylvania / Michigan | |
| South Dakota / Kansas | |
| New York / Pennsylvania | |
| New Mexico / Idaho | |
| Tennessee / Kansas | |
| Mississippi / Kentucky | |
| Rhode Island / New Hampshire | |
| Ohio / New Jersey | |
| Washington / Montana | |
| South Dakota / Michigan | |
| Ohio / New York | |
| Montana / Idaho | |
| Wisconsin / Nebraska | |
| Minnesota / North Dakota | |
| North Dakota / Montana | |
| Nebraska / Idaho | |
| New Mexico / Louisiana | |
| Rhode Island / New Jersey | |
| Tennessee / Ohio | |
| Texas / Kansas | |
| Nebraska / North Dakota | |
| Oregon / Washington | |
| North Carolina / Missouri | |
| Tennessee / Nebraska | |
| North Carolina / Mississippi | |
| Wyoming / Oregon | |
| West Virginia / Missouri | |
| Rhode Island / Pennsylvania | |
| North Carolina / Maryland | |
| New Hampshire / Vermont | |
| Michigan / Minnesota | |
| Vermont / Maine | |
| Texas / New Mexico | |
| Wisconsin / North Dakota | |
| Wyoming / Missouri | |
| Vermont / New Jersey | |
| Wisconsin / Ohio | |
| West Virginia / Michigan | |
| Vermont / Pennsylvania | |
| Utah / Washington | |
| West Virginia / New Jersey | |
| West Virginia / New York | |
| Pennsylvania / Ohio | |
| South Carolina / Virginia | |
| Tennessee / Maryland | |
| Wyoming / Washington | |
| Virginia / Mississippi | |
| Wyoming / Minnesota | |
| Utah / Texas | |
| Virginia / North Carolina | |
| Maryland / Virginia | |
| West Virginia / North Carolina | |
| Utah / South Dakota | |
|