County facts (Blue Book)

Publisher

Organization

Idaho Secretary of State

Publisher’s dataset

Blue Book of Idaho, 2025-2026

File or API used

https://archive.sos.idaho.gov/blue_book/blue_book_2025-2026.pdf

Retrieval script

scripts/fetch-sos-blue-book-counties.py

Coverage

Geography

Idaho's 44 counties

Time coverage

2025-2026

Update frequency

Biennial; a new edition follows each general election

Published

not stated

Retrieved

September 10, 2026

License of the records

Idaho public record.

Rows

44 records

Measures

Records

One row per Idaho county, from the Blue Book of Idaho's county-profile pages.

• geo: The county's 5-digit FIPS code, matched by name in data/geographies.json.
• county: County name as the Blue Book prints it, title-cased, without the word "County".
• established: The county's establishment date as printed, ISO format (YYYY-MM-DD).
• county_seat: The county seat as printed on the county's address line.
• website: The county's website as printed, or null if none is printed.

Caveats

• The established date is the Blue Book's own figure for each county's creation date, not independently verified against session laws.
• Idaho Code sections 31-103 through 31-146 (Title 31, Chapter 1) separately designate each county's boundaries and, for 40 of the 44 counties, its county seat; where both sources give a seat, they agree on it (allowing for wording, e.g. "Boise" here versus "Boise City" in statute). Bannock, Butte, Oneida and Power counties have no county-seat sentence in that statute chapter's current text, so no comparison exists for those four.
• The edition prints a citation year (2025) and no publication date, so no publisher date is stored; the edition is the 2025-2026 one.

How to cite

Understand Idaho, “Blue Book of Idaho, 2025-2026”, compiled from Idaho Secretary of State, Blue Book of Idaho, 2025-2026. Retrieved September 10, 2026. https://understandidaho.com/data/sos-blue-book-county-facts/.

Cite Idaho Secretary of State directly for the figures themselves.