Idaho vs Oregon

The two states, county by county

Both maps share one density scale, so the same shade means the same number of people per square mile on either side of the border. Darker counties are denser. Select a county to open its page.

Side by side

Population and density

Oregon has 4,272,371 residents, 2.1 times Idaho's 2,001,619. Idaho ranks 38th and Oregon 27th of the 50 states and DC. Oregon is the more crowded, with 44.5 people per square mile against 24.2, 84% more.

Land area

Oregon has 95,997 square miles of land, 16% more than Idaho's 82,645. The largest county-equivalent in Idaho is Idaho County at 8,478 square miles; in Oregon it is Harney County at 10,134.

Counties

Idaho is divided into 44 county-equivalents and Oregon into 36, so an average Idaho county covers 1,878 square miles against 2,667. The typical county in Idaho has 15,019 residents, against 46,128 in Oregon. The most populous are Ada County (535,799) and Multnomah County (795,897).

3 county names appear on both sides of the border: Jefferson, Lincoln, Washington. Use the FIPS code, not the name, when joining data across the two states.

Household income

The typical county household income is about the same in both: $67,254 in Idaho and $68,568 in Oregon. The highest county incomes are Teton County ($94,895) in Idaho and Washington County ($103,486) in Oregon, from SAIPE 2023.

Capitals and daylight

Boise and Salem are 349 miles apart in a straight line; from Boise the initial bearing is 288°, WNW. On June 21, 2026, Boise gets 15 h 26 min of daylight and Salem 15 h 37 min; on December 21 the figures are 8 h 56 min and 8 h 46 min. Month by month tables are on the Boise and Salem daylight pages.

Where they sit

Both are in the West region, but Idaho is in the Mountain division and Oregon in the Pacific division. By county internal points, Idaho spans 2 UTM zones and Oregon 2.