County · code 19003
Adams CountyIowa
Adams County is a county in Iowa with its seat in Corning, formed in 1851.
- Founded1851
- County seatCorning
- Named forJohn Adams
- Land area423 sq mi + 2.1 sq mi water
- Population3,704 2020 Census
- Parcels mapped10,119 checked 15 October 2026
Where it is
Adams on the map of Iowa
Iowa has 99 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Formed in 1851 from Pottawattamie County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Adams County was created on January 15, 1851, from Pottawattamie County but was not fully organized initially. The county was fully organized on March 7, 1853, with Montgomery County temporarily attached for election, revenue, and judicial purposes. Montgomery County was fully organized and detached from Adams on August 15, 1853.
- 1851Adams County created Adams created from Pottawattamie; Adams not fully organized, not attached. · Iowa Acts 1850-1851, ch. 9, sec. 3/pp. 27-28
- 1853Changed Adams fully organized; Montgomery attached to Adams "for election, revenue, and judicial purposes". · Iowa Acts 1852-1853, ch. 8, sec. 8, 11/p. 23
- 1853Changed Montgomery fully organized, detached from Adams. · Swisher, "Organization of Counties," 575
Land and parcels
What the maps cover in Adams
Who publishes each layer, how good it is, and when we last checked.
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Parcels Fallback
Lot lines and tax-map numbers for 10,119 parcels from Iowa Department of Homeland Security and Emergency Management (statewide parcels, mirrored by the University of Iowa). Drawn for tax purposes: usually within a few feet of a survey, but not a survey. This copy is a fallback, not the county's own: use it as a guide and check the official record.
edited 10 May 2024 · checked 15 October 2026 -
Address points Missing
No public address points layer found for Adams County yet.
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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
Adams 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
Adams 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 Adams County.
See your own lot on these maps
Open Adams 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 Adams County
- When was Adams County founded?
- Adams County was founded in 1851, formed from Pottawattamie County, and named after John Adams.
- What is the county seat of Adams County?
- The county seat of Adams County is Corning.
- Is there an online parcel map for Adams County?
- Yes. Iowa Department of Homeland Security and Emergency Management (statewide parcels, mirrored by the University of Iowa) publishes a parcel map of 10,119 parcels, rated fallback here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Adams County's boundary or name changed?
- Adams County was created in 1851 from Pottawattamie County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Montgomery County.
- Is my lot in a flood zone?
- We do not have flood maps for Adams County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby