Where is idaho located

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Last updated: April 8, 2026

Quick Answer: Idaho is located in the Pacific Northwest region of the United States, bordered by six states and one Canadian province. It became the 43rd state on July 3, 1890, and covers 83,569 square miles, making it the 14th largest state by area.

Key Facts

Idaho became the 43rd U.S. state on July 3, 1890
Covers 83,569 square miles (216,443 km²), ranking 14th largest in the U.S.
Population of approximately 1.9 million people as of 2023
Bordered by 6 U.S. states and 1 Canadian province
State capital is Boise, located in southwestern Idaho

Overview

Idaho is a state located in the Pacific Northwest region of the United States, known for its diverse geography that includes mountains, forests, and agricultural plains. The state's name is believed to have been coined by mining lobbyist George M. Willing, who claimed it meant "gem of the mountains" in a Native American language, though this etymology has been disputed by historians. Idaho's history includes Native American habitation for thousands of years, followed by European exploration in the early 19th century by the Lewis and Clark Expedition in 1805-1806.

The Oregon Trail brought significant settlement to the region in the mid-19th century, with Idaho becoming part of the Oregon Territory in 1848. After various territorial reorganizations, Idaho Territory was established in 1863, encompassing much of present-day Idaho, Montana, and Wyoming. The discovery of gold in 1860 sparked a mining boom that attracted thousands of settlers, fundamentally changing the region's demographics and economy. Statehood was achieved in 1890 after years of political maneuvering and population growth.

How It Works

Understanding Idaho's location involves examining its geographical coordinates, political boundaries, and regional context.

Geographical Coordinates: Idaho spans from approximately 42°N to 49°N latitude and 111°W to 117°W longitude, placing it in the northern interior of the western United States. The state's highest point is Borah Peak at 12,662 feet (3,859 meters) in the Lost River Range, while its lowest point is 710 feet (216 meters) where the Snake River exits into Washington.
Political Boundaries: Idaho shares borders with six U.S. states: Montana to the northeast, Wyoming to the east, Nevada and Utah to the south, Oregon to the west, and Washington to the northwest. Additionally, it shares a 45-mile (72 km) international border with the Canadian province of British Columbia to the north. These boundaries were established through various treaties and congressional acts between 1846 and 1868.
Regional Context: Idaho is part of the Pacific Northwest region, which typically includes Washington, Oregon, and sometimes British Columbia. The state contains portions of several major geographical regions including the Rocky Mountains in the east, the Columbia Plateau in the south, and the Intermountain West. The Continental Divide runs through central Idaho, affecting watershed patterns and climate.
Transportation Access: Major interstate highways include I-84 (east-west) and I-15 (north-south), connecting Idaho to neighboring states and beyond. The state has 16 public airports, with Boise Airport being the largest, handling over 4 million passengers annually. Rail lines operated by Union Pacific and BNSF provide freight connections throughout the region.

Key Comparisons

Feature	Idaho	Neighboring Montana
Land Area	83,569 sq mi (216,443 km²)	147,040 sq mi (380,800 km²)
Population Density	22.6 people/sq mi (8.7/km²)	7.4 people/sq mi (2.9/km²)
Highest Elevation	Borah Peak: 12,662 ft (3,859 m)	Granite Peak: 12,807 ft (3,904 m)
Statehood Date	July 3, 1890 (43rd state)	November 8, 1889 (41st state)
Major River System	Snake River (1,078 mi/1,735 km in ID)	Missouri River (745 mi/1,199 km in MT)

Why It Matters

Economic Significance: Idaho's location makes it a crucial agricultural producer, particularly for potatoes where it leads the nation with approximately 30% of U.S. potato production. The state's position along transportation corridors facilitates $30 billion in annual exports, with Canada and Mexico as top trading partners. Mining operations extract valuable resources including silver, phosphate, and gold worth over $2 billion annually.
Environmental Importance: Idaho contains portions of the largest contiguous wilderness in the lower 48 states, with the Frank Church-River of No Return Wilderness covering 2.3 million acres. The state's location within the Columbia River Basin affects water management for irrigation, hydropower, and salmon migration across the Pacific Northwest. Climate patterns create distinct growing regions, with the Snake River Plain receiving only 10-15 inches of annual precipitation.
Cultural and Political Impact: Idaho's border location influences its political identity as a conservative state with unique regional characteristics. The state's position between more populous coastal regions and sparsely populated interior states creates distinct migration patterns, with Idaho experiencing 16.5% population growth from 2010-2020. Native American tribes including the Shoshone-Bannock and Nez Perce maintain cultural connections to specific geographical areas within the state.

Looking forward, Idaho's strategic location will continue to influence its development as transportation infrastructure evolves and climate patterns shift. The state's position between major economic centers in the Pacific Northwest and Intermountain West creates opportunities for growth in technology, renewable energy, and sustainable agriculture. As population pressures increase in western states, Idaho's relative geographical advantages may attract further investment and migration while necessitating careful management of natural resources and infrastructure.