Oregon Borders: States, Map & Complete Guide

Washington and Oregon are separated primarily by the Columbia River along Oregon's northern edge. This powerful river creates one of the most scenic state borders in America.

The Oregon-Washington border follows the Columbia River for about 300 miles from the Pacific Ocean inland to the Idaho border area. The river carves through the Cascade Mountains in the Columbia River Gorge, creating dramatic cliffs and waterfalls. Oregon counties along this border include Clatsop, Columbia, Multnomah, Hood River, Wasco, Sherman, Gilliam, Morrow, and Umatilla. Major cities near this border include Portland and The Dalles in Oregon. A small land border exists in the far northwest corner near the coast.

Idaho borders Oregon on the eastern side. The Snake River forms a significant portion of this boundary in the northern section, while a land border continues to the south.

The Oregon-Idaho border extends for about 375 miles from Washington in the north to Nevada in the south. The Snake River creates a natural border for roughly 200 miles in the northern portion, carving Hells Canyon—the deepest river gorge in North America. South of the Snake River, the border follows surveyed meridian lines. Oregon counties along this border include Wallowa, Baker, Malheur, and Harney. The remote southeastern portion crosses high desert country.

Nevada and Oregon share a border in Oregon's southeastern corner. The boundary follows a straight east-west line along the 42nd parallel north latitude.

The Oregon-Nevada border runs for about 180 miles along the 42nd parallel from Idaho in the east to California in the west. This straight surveyed line crosses high desert terrain with sparse population. Only two Oregon counties touch this border: Malheur and Harney. The border region includes parts of the Great Basin desert ecosystem.

California forms Oregon's entire southern border. The state line follows the 42nd parallel north latitude, creating a straight east-west boundary.

The Oregon-California border stretches about 365 miles from the Pacific Ocean in the west to Nevada in the east. The border follows the 42nd parallel surveyed in the 1800s. Oregon counties along this border include Curry, Josephine, Jackson, Klamath, and Lake. The border crosses through diverse terrain including coastal forests, the Cascade Mountains, and high desert. Cities near the border include Medford and Klamath Falls in Oregon.

The Pacific Ocean borders Oregon's western edge from Washington in the north to California in the south. Unlike many coastal states, Oregon law guarantees public access to all beaches.

Oregon's Pacific coastline extends about 363 miles of general shoreline. The coast features dramatic sea stacks, tide pools, sand dunes, and rocky cliffs. Oregon counties with ocean coastline include Clatsop, Tillamook, Lincoln, Lane, Douglas, Coos, and Curry. Major coastal cities include Astoria, Newport, and Coos Bay. Highway 101 runs along the entire Oregon coast, offering scenic views throughout.