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County · code 16045

Gem CountyIdaho

Gem County is a county in Idaho with its seat in Emmett. It was created on May 11, 1915, from parts of Boise and Canyon counties.

  • Founded1915
  • County seatEmmett
  • Land area560 sq mi + 4.8 sq mi water
  • Population19,123 2020 Census
  • Parcels mapped11,836 checked 16 October 2026
Open the free map Click any parcel in Gem County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

PayetteCanyonWashingtonAdaBoiseAdamsValley Emmett Census outline · seat marked

Where it is

Gem 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 CountyFranklin CountyFremont CountyGooding CountyIdaho CountyJefferson CountyJerome CountyKootenai CountyLatah CountyLemhi CountyLewis CountyLincoln CountyMadison CountyMinidoka CountyNez Perce CountyOneida CountyOwyhee CountyPayette CountyPower CountyShoshone CountyTeton CountyTwin Falls CountyValley CountyWashington CountyGem County Gem
Counties of Idaho · Gem highlighted

History

Formed in 1915 from Boise County and Canyon County

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

Gem County was established through an act approved on March 19, 1915, which became effective by vote in the general election on May 11, 1915. The county was formed from territory taken from Boise County and Canyon County.

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

  1. 1915
    Gem County created Gem created from Boise and Canyon. Act approved 19 March 1915, became effective through a vote in the general election of 11 May 1915.
    from Boisefrom Canyon
    · Id. Laws 1915, 13th sess., ch. 165/pp. 362-375; Id. Code Ann. (1996), vol. 6, ch. 1, sec. 31-125 "Gem Co."/p. 35

Land and parcels

What the maps cover in Gem

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

Gem by the Census

Population
19,123 2020 Census count
Housing units
7,563 2020 Census count
Land area
560 square miles
Water area
4.8 square miles
People per sq mi
34 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

Gem County's official site

We have found the county's site but not its offices yet; start there.

County government

See your own lot on these maps

Open Gem 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 Gem County

When was Gem County founded?
Gem County was founded in 1915, formed from Boise County and Canyon County.
What is the county seat of Gem County?
The county seat of Gem County is Emmett.
Is there an online parcel map for Gem County?
Yes. Idaho Department of Water Resources publishes a parcel map of 11,836 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Gem County's boundary or name changed?
Gem County was created in 1915 from Boise County and Canyon County. The Atlas of Historical County Boundaries records no boundary change since.
Is my lot in a flood zone?
We do not have flood maps for Gem 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