County · code 16083
Twin Falls CountyIdaho
Twin Falls County is in Idaho and was established in 1907, with Twin Falls as its county seat.
- Founded1907
- County seatTwin Falls
- Named forTwin Falls, Idaho
- Land area1,922 sq mi + 7 sq mi water
- Population90,046 2020 Census
- Parcels mapped46,722 checked 16 October 2026
Where it is
Twin Falls 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 1907 from Cassia County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Twin Falls County was created on February 21, 1907, from Cassia County. The county is named after Twin Falls.
- 1907Twin Falls County created Twin Falls created from Cassia. · Id. Laws 1907, 9th sess., pp. 40-41
Land and parcels
What the maps cover in Twin Falls
Who publishes each layer, how good it is, and when we last checked.
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Parcels Good enough
Lot lines and tax-map numbers for 46,722 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, 30,075 in all.
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
Twin Falls 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.
County government
- County government
The official website of Twin Falls County.
See your own lot on these maps
Open Twin Falls 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 Twin Falls County
- When was Twin Falls County founded?
- Twin Falls County was founded in 1907, formed from Cassia County, and named after Twin Falls, Idaho.
- What is the county seat of Twin Falls County?
- The county seat of Twin Falls County is Twin Falls.
- Is there an online parcel map for Twin Falls County?
- Yes. Idaho Department of Water Resources publishes a parcel map of 46,722 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Twin Falls County's boundary or name changed?
- Twin Falls County was created in 1907 from Cassia County. The Atlas of Historical County Boundaries records no boundary change since.
- Who issues building permits in Twin Falls County?
- The county's page on building permits: Building Permit Design Criteria. Inside a city or town, ask that city first.
- Is my lot in a flood zone?
- We do not have flood maps for Twin Falls County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby