County · code 16021
Boundary CountyIdaho
Boundary County is a county in Idaho with its seat in Bonners Ferry, formed in 1915.
- Founded1915
- County seatBonners Ferry
- Named forCanada–United States border
- Land area1,269 sq mi + 9.4 sq mi water
- Population12,056 2020 Census
- Parcels mapped10,884 checked 16 October 2026
Where it is
Boundary on the map of Idaho
Idaho has 44 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Formed in 1915 from Bonner County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Boundary County was created from Bonner County on January 23, 1915, and named after the Canada–United States border.
- 1915Boundary County created Boundary created from Bonner. · Id. Laws 1915, 13th sess., ch. 7/pp. 21-29
Land and parcels
What the maps cover in Boundary
Who publishes each layer, how good it is, and when we last checked.
-
Parcels Good enough
Lot lines and tax-map numbers for 10,884 parcels from Idaho Department of Water Resources. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
checked 16 October 2026 -
Address points Good enough
One point per address, 7,390 in all from Boundary County.
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
Boundary 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
Who to ask before you build, dig or sell
Official county pages only. We link to them; we do not copy them, because they change.
Inside a city or town, permits usually come from that city rather than the county.
Records
Zoning and code
GIS and maps
County government
- County government
The official website of Boundary County.
See your own lot on these maps
Open Boundary 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 Boundary County
- When was Boundary County founded?
- Boundary County was founded in 1915, formed from Bonner County, and named after Canada–United States border.
- What is the county seat of Boundary County?
- The county seat of Boundary County is Bonners Ferry.
- Is there an online parcel map for Boundary County?
- Yes. Idaho Department of Water Resources publishes a parcel map of 10,884 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Boundary County's boundary or name changed?
- Boundary County was created in 1915 from Bonner County. The Atlas of Historical County Boundaries records no boundary change since.
- Who issues building permits in Boundary County?
- The county's page on building permits: Approach Permits – Boundary County. Inside a city or town, ask that city first.
- Is my lot in a flood zone?
- We do not have flood maps for Boundary County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby