County · code 30005
Blaine CountyMontana
Blaine County is a county in Montana with its seat in Chinook, formed on February 29, 1912.
- Founded1912
- County seatChinook
- Named forJames G. Blaine
- Land area4,228 sq mi + 11 sq mi water
- Population7,044 2020 Census
- Parcels mapped12,990 checked 14 October 2026
Where it is
Blaine on the map of Montana
Montana has 56 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Formed in 1912 from Chouteau County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Blaine County was created by petition and election from Chouteau County on February 29, 1912. The county was named after James G. Blaine. In 1915, Blaine County lost territory to the creation of Phillips County.
- 1912Blaine County created Blaine created by petition and election from Chouteau. · Mont. Rev. Code 1921, sec. 4307/pp. 1557-1559; Burlingame, 17-18
- 1915Lost territory Blaine lost to creation of Phillips. · Mont. Rev. Code 1921, sec.4338/pp. 1599-1601; Burlingame, 17-19
Land and parcels
What the maps cover in Blaine
Who publishes each layer, how good it is, and when we last checked.
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Parcels Good enough
Lot lines and tax-map numbers for 12,990 parcels. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
checked 14 October 2026 -
Address points Official
One point per address, 3,820 in all from Montana State Library.
edited 13 October 2026 · checked 14 October 2026 -
Buildings Reference
Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026
- Official
- from the office that keeps the record
- Good enough
- a reliable statewide or national copy
- Fallback
- a guide only; check the official record
- Missing
- nothing public found yet
People and land
Blaine by the Census
Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.
Rules and offices
Blaine County's official site
We have found the county's site but not its offices yet; start there.
County government
- County government
The official website of Blaine County.
See your own lot on these maps
Open Blaine County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.
Questions
Common questions about Blaine County
- When was Blaine County founded?
- Blaine County was founded in 1912, formed from Chouteau County, and named after James G. Blaine.
- What is the county seat of Blaine County?
- The county seat of Blaine County is Chinook.
- Is there an online parcel map for Blaine County?
- Yes. A public source publishes a parcel map of 12,990 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Blaine County's boundary or name changed?
- Blaine County was created in 1912 from Chouteau County. Since then the Atlas of Historical County Boundaries records 1 later change, chiefly involving Phillips County.
- Is my lot in a flood zone?
- We do not have flood maps for Blaine County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby