When was Bannock County founded?

Bannock County was founded in 1893, formed from Bingham County, and named after Bannock people.

What is the county seat of Bannock County?

The county seat of Bannock County is Pocatello.

Is there an online parcel map for Bannock County?

Yes. Bannock County publishes a parcel map of 46,065 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.

Has Bannock County's boundary or name changed?

Bannock County was created in 1893 from Bingham County. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Franklin County, Caribou County and Oneida County.

Who issues building permits in Bannock County?

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

Is my lot in a flood zone?

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

County · code 16005

Bannock CountyIdaho

Bannock County is a county in Idaho with its seat in Pocatello, formed in 1893 from Bingham County. The county is named after the Bannock people.

Founded1893
County seatPocatello
Named forBannock people
Land area1,112 sq mi + 36 sq mi water
Population87,018 2020 Census
Parcels mapped46,065 checked 15 October 2026

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

Updated 19 October 2026

Census outline · seat marked

History

Formed in 1893 from Bingham County

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

Bannock County was created from Bingham County on March 6, 1893. Over the following decades, the county lost territory to several neighboring counties: Franklin County (1918 and 1946), and Caribou County (1948), while gaining territory from Oneida and Power counties in 1927.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries; the 5 that matter most are shown first.

1893
Bannock County created Bannock created from Bingham.
from Bingham
6 March 1893 · Id. Laws 1893, 2nd sess., pp. 170-174
1918
Lost territory Bannock lost to Franklin. Act approved 8 February 1917, became effective through a vote in the general election of 6 November 1918 when citizens in the east half of Township 13S / Ranges 39, 40, 41E, and citizens in an adjoining one-quarter mile strip of Township 14S voted to detach themselves from Bannock and become part of Franklin.
to Franklin
6 November 1918 · Id. Laws 1917, 14th sess., ch. 96/pp. 327-329; Id. Code Ann. (1996), vol. 6, ch. 1, sec. 31-123 "Franklin Co."/p. 33
1927
Gained territory Bannock gained from Oneida; exchanged with Power.
from Oneida from Power
15 March 1927 · Id. Laws 1927, 19th sess., ch. 256/pp. 431-439
1946
Lost territory Bannock lost to Franklin. Act approved 14 March 1945, became effective through a vote in the general election of 5 November 1946.
to Franklin
5 November 1946 · Id. Laws 1945, 28th sess., ch. 145/pp. 216-224; Id. Code Ann. (1996), vol. 6, ch. 1, sec. 31-105 "Bannock Co."/pp. 9-10
1948
Lost territory Bannock lost to Caribou. Areas of loss described in two separate acts approved 18 Mar 1947, became effective through a vote in the general election of 2 November 1948.
to Caribou
2 November 1948 · Id. Laws 1947, 29th sess., ch. 247/pp. 638-648; ch. 248/pp. 648-657; Id. Code Ann. (1996), vol. 6, ch. 1, sec. 31-105 "Bannock Co."/pp. 9-10

Show all 8 changes (3 more, mostly small adjustments)

1893
Bannock County created Bannock created from Bingham.
from Bingham
6 March 1893 · Id. Laws 1893, 2nd sess., pp. 170-174
1918
Lost territory Bannock lost to Franklin. Act approved 8 February 1917, became effective through a vote in the general election of 6 November 1918 when citizens in the east half of Township 13S / Ranges 39, 40, 41E, and citizens in an adjoining one-quarter mile strip of Township 14S voted to detach themselves from Bannock and become part of Franklin.
to Franklin
6 November 1918 · Id. Laws 1917, 14th sess., ch. 96/pp. 327-329; Id. Code Ann. (1996), vol. 6, ch. 1, sec. 31-123 "Franklin Co."/p. 33
1919
Lost territory Bannock lost to creation of Caribou. Same act also authorized Bannock to annex territory from Caribou, dependent on a vote in the general election of November 1920; proposed annexation failed in referendum (no change).
to Caribou
11 February 1919 · Id. Laws 1919, 15th sess., ch. 5/pp. 28-42; Id. Code Ann. (1996), vol. 6, ch. 1, sec. 31-117 "Caribou Co."/p. 24
1927
Gained territory Bannock gained from Oneida; exchanged with Power.
from Oneida from Power
15 March 1927 · Id. Laws 1927, 19th sess., ch. 256/pp. 431-439
1931
Changed Legislature authorized Franklin to annex territory from Bannock, dependent on a vote in the general election of November 1932. Proposed annexation failed in referendum (no change).
Franklin
17 March 1931 · Id. Laws 1931, 21st sess., ch. 63/pp. 106-113; Id. Code Ann. (1996), vol. 6, ch. 1, sec. 31-105 "Bannock Co."/p. 8
1946
Lost territory Bannock lost to Franklin. Act approved 14 March 1945, became effective through a vote in the general election of 5 November 1946.
to Franklin
5 November 1946 · Id. Laws 1945, 28th sess., ch. 145/pp. 216-224; Id. Code Ann. (1996), vol. 6, ch. 1, sec. 31-105 "Bannock Co."/pp. 9-10
1947
Changed Legislature authorized Franklin to annex territory from Bannock, dependent on a vote in the general election of November 1948. Proposed annexation failed in referendum (no change).
Franklin
19 March 1947 · Id. Laws 1947, 29th sess., ch. 255/pp. 699-706; Id. Code Ann. (1996), vol. 6, ch. 1, sec. 31-105 "Bannock Co."/p. 8
1948
Lost territory Bannock lost to Caribou. Areas of loss described in two separate acts approved 18 Mar 1947, became effective through a vote in the general election of 2 November 1948.
to Caribou
2 November 1948 · Id. Laws 1947, 29th sess., ch. 247/pp. 638-648; ch. 248/pp. 648-657; Id. Code Ann. (1996), vol. 6, ch. 1, sec. 31-105 "Bannock Co."/pp. 9-10

Land and parcels

What the maps cover in Bannock

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

Parcels Good enough

Lot lines and tax-map numbers for 46,065 parcels from Bannock County. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
checked 15 October 2026
Address points Good enough

One point per address, 36,314 in all from Bannock County.
checked 13 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

Bannock by the Census

Population

87,018 2020 Census count

Housing units

34,903 2020 Census count

Land area

1,112 square miles

Water area

36 square miles

People per sq mi

78 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.

Permits

Building Permitfrom bannockcountyid.viewpointcloud.com
Weapon Permitsfrom bannockcounty.gov

Zoning and code

Bannock County Codefrom library.municode.com
County Codefrom library.municode.com

County government

County government
The official website of Bannock County.
bannockcounty.us

See your own lot on these maps

Open Bannock 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 Bannock County

When was Bannock County founded?: Bannock County was founded in 1893, formed from Bingham County, and named after Bannock people.
What is the county seat of Bannock County?: The county seat of Bannock County is Pocatello.
Is there an online parcel map for Bannock County?: Yes. Bannock County publishes a parcel map of 46,065 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Bannock County's boundary or name changed?: Bannock County was created in 1893 from Bingham County. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Franklin County, Caribou County and Oneida County.
Who issues building permits in Bannock County?: The county's page on building permits: Building Permit. Inside a city or town, ask that city first.
Is my lot in a flood zone?: We do not have flood maps for Bannock County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby