From the Guide to 2010 State and Local Census Geography — Idaho — History:

The United States acquired the area of Idaho through a treaty with Great Britain in 1846.  Idaho Territory was organized from parts of Dakota, Nebraska, and Washington territories on March 3, 1863, and included parts of present-day Montana and Wyoming. Its area was reduced in 1864 by the organization of Montana Territory and again in 1868 by the organization of Wyoming Territory, to generally the same boundary as the present state. Idaho was admitted to the Union on July 3, 1890, as the 43rd state.

Data for the legally established state of Idaho are available beginning with the 1900 census.

From QuickFacts: statistics for all states and counties, and for cities and towns with a population of 5,000 or more.

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From data.census.gov — the U.S. Census Bureau's new dissemination platform.

Source: 2018 American Community Survey (ACS), 1-Year Estimates.

From the Statistics in Schools program:

From Census Business Builder: Regional Analyst Edition - 3.0.1:

From the State Data Center (SDC) Program:

From Foreign Trade > U.S. International Trade Data:

Note: After you create an account, you can choose between State Export Data (Origin of Movement) or State Import Data (State of Destination) by Harmonized System (HS) or NAICS. For more information, see the Quick Start Guide.