When was Bonneville County founded?

Bonneville County was founded in 1911, formed from Bingham County, and named after Benjamin Bonneville.

What is the county seat of Bonneville County?

The county seat of Bonneville County is Idaho Falls.

Is there an online parcel map for Bonneville County?

Yes. Idaho Department of Water Resources publishes a parcel map of 65,225 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.

Has Bonneville County's boundary or name changed?

Bonneville County was created in 1911 from Bingham County. The Atlas of Historical County Boundaries records no boundary change since.

Who issues building permits in Bonneville County?

The county's page on building permits: Building & Zoning Applications. Inside a city or town, ask that city first.

Is my lot in a flood zone?

We do not have flood maps for Bonneville County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

County · code 16019

Bonneville CountyIdaho

Bonneville County is in eastern Idaho and has its county seat in Idaho Falls. The county was formed in 1911.

Founded1911
County seatIdaho Falls
Named forBenjamin Bonneville
Land area1,866 sq mi + 34 sq mi water
Population123,964 2020 Census
Parcels mapped65,225 checked 16 October 2026

Open the free map Click any parcel in Bonneville County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated 19 October 2026

Census outline · seat marked

History

Formed in 1911 from Bingham County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Bonneville County was created from Bingham County on February 7, 1911. It was named after Benjamin Bonneville.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

1911
Bonneville County created Bonneville created from Bingham.
from Bingham
7 February 1911 · Id. Laws 1911, 11th sess., ch. 5/pp. 8-9

Land and parcels

What the maps cover in Bonneville

Who publishes each layer, how good it is, and when we last checked.

Parcels Good enough

Lot lines and tax-map numbers for 65,225 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 Missing

No public address points layer found for Bonneville County yet.
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

Bonneville by the Census

Population

123,964 2020 Census count

Housing units

45,214 2020 Census count

Land area

1,866 square miles

Water area

34 square miles

People per sq mi

66 population ÷ land area

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

Assessor and property recordsfrom bonnevillecountyidaho.gov · checked 13 October 2026

Permits

Building & Zoning Applicationsfrom bonnevillecountyidaho.gov
Catering Permitfrom bonnevillecountyidaho.gov

Zoning and code

Planning and zoningfrom bonnevillecountyidaho.gov · checked 13 October 2026
Zoning Mapfrom bonnevillecountyidaho.gov

GIS and maps

County GIS and mapsfrom bonnevillecountyidaho.gov · checked 13 October 2026

County government

County government
The official website of Bonneville County.
bonnevillecountyidaho.gov

See your own lot on these maps

Open Bonneville 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.

Open the free map no sign-in Pro early access

Questions

Common questions about Bonneville County

When was Bonneville County founded?: Bonneville County was founded in 1911, formed from Bingham County, and named after Benjamin Bonneville.
What is the county seat of Bonneville County?: The county seat of Bonneville County is Idaho Falls.
Is there an online parcel map for Bonneville County?: Yes. Idaho Department of Water Resources publishes a parcel map of 65,225 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Bonneville County's boundary or name changed?: Bonneville County was created in 1911 from Bingham County. The Atlas of Historical County Boundaries records no boundary change since.
Who issues building permits in Bonneville County?: The county's page on building permits: Building & Zoning Applications. Inside a city or town, ask that city first.
Is my lot in a flood zone?: We do not have flood maps for Bonneville County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

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