County · code 16085
Valley CountyIdaho
Valley County is a county in Idaho with its seat in Cascade, formed in 1918.
- Founded1918
- County seatCascade
- Land area3,665 sq mi + 68 sq mi water
- Population11,746 2020 Census
- Parcels mapped26,326 checked 16 October 2026
Where it is
Valley 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 1918 from Boise County and Idaho County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Valley County was created on November 6, 1918, from parts of Boise County and Idaho County through an act approved in February 1917.
- 1918Valley County created Valley created from Boise and Idaho. Act approved 26 February 1917, became effective through a vote in the general election of November 1918. · Id. Laws 1917, 14th sess., ch. 99/pp. 360-372
- 1919Changed Legislature authorized Valley to annex territory from Idaho, dependent on a vote in the general election of November 1920. No evidence this vote ever took place (no change). · Id. Laws 1919, 15th sess., ch. 101/pp. 366-367; Id. Code Ann. (1996), vol. 6, ch. 1, sec. 31-145 "Valley Co."/pp. 56-57
Land and parcels
What the maps cover in Valley
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 26,326 parcels from Valley County. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 8 September 2026 · checked 16 October 2026 -
Address points Good enough
One point per address, 22,242 in all.
edited 8 October 2026 · 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
Valley 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
Valley County's official site
We have found the county's site but not its offices yet; start there.
County government
- County government
The official website of Valley County.
See your own lot on these maps
Open Valley 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 Valley County
- When was Valley County founded?
- Valley County was founded in 1918, formed from Boise County and Idaho County.
- What is the county seat of Valley County?
- The county seat of Valley County is Cascade.
- Is there an online parcel map for Valley County?
- Yes. Valley County publishes a parcel map of 26,326 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Valley County's boundary or name changed?
- Valley County was created in 1918 from Boise County and Idaho County. Its boundary has been clarified one time since, with no change on the ground.
- Is my lot in a flood zone?
- We do not have flood maps for Valley County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby