Counties of Idaho — names, county seats, populations, areas, and founding dates

Overview

Each county in Idaho is a defined geographic and political subdivision with responsibilities that commonly include maintaining local roads, administering elections, managing courts and jails, collecting certain taxes, and providing public records. Counties vary widely in both land area and population, from sparsely populated rural counties to those containing larger towns and regional centers. Every county has a county seat, the town or city that typically hosts the main government offices and courthouse.

History and development

The counties of Idaho were established over time as the territory and later the state were settled and organized. County boundaries and names reflect historical settlement patterns, transportation routes, and political decisions made during the 19th and early 20th centuries. Some county borders have changed since their creation as populations shifted and new administrative needs arose.

What a full county list includes

A comprehensive list of Idaho counties normally provides, for each county:

• the county name and county seat
• date of establishment
• population figures from recent censuses
• total land and water area
• the county's Federal Information Processing Standard (FIPS) code

Using county information

County-level data are used for planning, public administration, emergency services, statistical analysis, and historical research. When consulting or compiling county lists, check the latest official sources for up-to-date population estimates, boundary changes, and administrative details.