What Lies North of Wyoming? Not a U.S. State

No American state sits directly north of Wyoming. The Cowboy State's northern border abuts two Canadian provinces:

• Montana — Actually borders Wyoming's northwestern corner, running roughly northwest-southeast
• South Dakota — Touches the northeastern edge
• Nebraska — Borders the eastern side

The true northern neighbors are:

• British Columbia — Along Wyoming's far northwestern tip
• Alberta — Along the main northern boundary

Complete Border Summary

Wyoming's rectangular-ish shape (a latitude-longitude rectangle) means its "north" is a true line of latitude—the 45th parallel north—making the international boundary unambiguous.