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County · code 16041

Franklin CountyIdaho

Franklin County is a county in Idaho with its seat in Preston, formed in 1913.

  • Founded1913
  • County seatPreston
  • Named forFranklin D. Richards
  • Land area663 sq mi + 4.7 sq mi water
  • Population14,194 2020 Census
  • Parcels mapped11,136 checked 16 October 2026
Open the free map Click any parcel in Franklin County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

Cache, UTBear LakeBannockCaribouOneidaRich, UT Preston Census outline · seat marked

Where it is

Franklin on the map of Idaho

Idaho has 44 counties and county equivalents, each with its own records office. Shapes with a page are links.

Ada CountyAdams CountyBannock CountyBear Lake CountyBenewah CountyBingham CountyBlaine CountyBoise CountyBonner CountyBonneville CountyBoundary CountyButte CountyCamas CountyCanyon CountyCaribou CountyCassia CountyClark CountyClearwater CountyCuster CountyElmore CountyFremont CountyGem CountyGooding CountyIdaho CountyJefferson CountyJerome CountyKootenai CountyLatah CountyLemhi CountyLewis CountyLincoln CountyMadison CountyMinidoka CountyNez Perce CountyOneida CountyOwyhee CountyPayette CountyPower CountyShoshone CountyTeton CountyTwin Falls CountyValley CountyWashington CountyFranklin County Franklin
Counties of Idaho · Franklin highlighted

History

Formed in 1913 from Oneida County

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

Franklin County was created from Oneida County on January 30, 1913. The county was named after Franklin D. Richards. Franklin gained territory from Bannock County in 1918 and again in 1946, with proposed annexations in 1932 and 1948 both failing in referendum.

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

  1. 1913
    Franklin County created Franklin created from Oneida.
    from Oneida
    · Id. Laws 1913, 12th sess., ch. 5/pp. 22-30
  2. 1918
    Gained territory Franklin gained from Bannock. Act approved 8 Feb 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.
    from Bannock
    · 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
  3. 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).
    Bannock
    · Id. Laws 1931, 21st sess., ch. 63/pp. 106-113; Id. Code Ann. (1996), vol. 6, ch. 1, sec. 31-123 "Franklin Co."/p. 33
  4. 1946
    Gained territory Franklin gained from Bannock. Act approved 14 March 1945, became effective through a vote in the general election of 5 November 1946.
    from Bannock
    · 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
  5. 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).
    Bannock
    · 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

Land and parcels

What the maps cover in Franklin

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

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

Franklin by the Census

Population
14,194 2020 Census count
Housing units
4,985 2020 Census count
Land area
663 square miles
Water area
4.7 square miles
People per sq mi
21 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

Zoning and code

County government

See your own lot on these maps

Open Franklin 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.

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Questions

Common questions about Franklin County

When was Franklin County founded?
Franklin County was founded in 1913, formed from Oneida County, and named after Franklin D. Richards.
What is the county seat of Franklin County?
The county seat of Franklin County is Preston.
Is there an online parcel map for Franklin County?
Yes. Idaho Department of Water Resources publishes a parcel map of 11,136 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Franklin County's boundary or name changed?
Franklin County was created in 1913 from Oneida County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Bannock County.
Is my lot in a flood zone?
We do not have flood maps for Franklin County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door