Wyoming Borders: States, Map & Complete Guide

Montana and Wyoming share a border along Wyoming's entire northern edge. The boundary follows the 45th parallel north latitude, creating a straight east-west line.

The Wyoming-Montana border extends for about 365 miles from Idaho in the west to South Dakota in the east. The border follows the 45th parallel surveyed in the 1800s. Wyoming counties along this border include Teton, Park, Big Horn, Sheridan, and Campbell. The border crosses diverse terrain including mountains in Yellowstone National Park in the west and high plains in the east. Yellowstone National Park straddles this border, with portions in both states.

Idaho borders Wyoming on the western side. The boundary follows straight surveyed meridian lines running north-south through mountainous terrain.

The Wyoming-Idaho border runs for about 150 miles from Montana in the north to Utah in the south. The border follows surveyed meridian lines established when the territories were created. Wyoming counties along this border include Teton, Lincoln, and Uinta. The border passes through the Rocky Mountains, including the Teton Range. Jackson Hole, Wyoming sits near this border with Grand Teton National Park extending to the Idaho line.

Utah borders Wyoming in the southwestern corner. The boundary follows the 41st parallel north latitude, creating a straight east-west line.

The Wyoming-Utah border extends for about 110 miles from Idaho in the west to Colorado in the east. The border follows the 41st parallel. Wyoming counties along this border include Uinta and Sweetwater. The border crosses high desert plateau country in the Green River Basin region. This remote border area is sparsely populated with rugged terrain.

Colorado forms Wyoming's entire southern border. The boundary follows the 41st parallel north latitude, creating a perfectly straight east-west line.

The Wyoming-Colorado border stretches about 365 miles from Utah in the west to Nebraska in the east. The border follows the 41st parallel surveyed in the 1860s and 1870s. Wyoming counties along this border include Sweetwater, Carbon, Albany, and Laramie. The border crosses from high desert in the west through the Medicine Bow Mountains to the high plains in the east. Cheyenne, Wyoming's capital and largest city, sits about 10 miles from the Colorado border.

Nebraska borders Wyoming along the eastern side. The boundary follows a straight north-south meridian line across the high plains.

The Wyoming-Nebraska border runs for about 180 miles from South Dakota in the north to Colorado in the south. The border follows the 104th meridian west longitude. Wyoming counties along this border include Goshen, Platte, and Laramie. The border crosses rolling grasslands and agricultural areas of the High Plains. This is Wyoming's most populated border region, with Cheyenne near the southern end.

South Dakota borders Wyoming in the northeastern region. The boundary follows straight surveyed lines through the plains and Black Hills.

The Wyoming-South Dakota border extends for about 155 miles from Montana in the north to Nebraska in the south. The border follows meridian and parallel lines surveyed when the territories were established. Wyoming counties along this border include Crook and Weston. The Black Hills span both states in this region, with Devils Tower National Monument in Wyoming near the border. This border area includes portions of the Powder River Basin.