County · code 18001
Adams CountyIndiana
Adams County is in Indiana and was formed in 1835 with its seat in Decatur.
- Founded1835
- County seatDecatur
- Named forJohn Quincy Adams
- Land area339 sq mi + 1 sq mi water
- Population35,809 2020 Census
- Parcels mapped20,186 checked 15 October 2026
Where it is
Adams on the map of Indiana
Indiana has 92 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Formed in 1835 from Allen County and Randolph County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Adams County was created from parts of Allen and Randolph counties and from non-county area, but was not fully organized until 1836.
- 1835Adams County created Adams created from parts of Adams New Purchase attached to Allen and Randolph, and from all of Non-County Area 9 attached to Allen; Adams not fully organized, parts attached to Allen and Randolph for administrative and judicial purposes. · Ind. Acts 1834, 19th sess., gen., ch. 25, sec. 1/p. 44
- 1836
Land and parcels
What the maps cover in Adams
Who publishes each layer, how good it is, and when we last checked.
-
Parcels Good enough
Lot lines and tax-map numbers for 20,186 parcels from Indiana Geographic Information Office (IndianaMap). Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 6 October 2026 · checked 15 October 2026 -
Address points Official
One point per address, 15,921 in all from Indiana Geographic Information Office (IGIO).
edited 8 March 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
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
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.
Zoning and code
- Planning and zoning
Building & Planning Office
GIS and maps
- County GIS and maps
Geographical Information Systems
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 1835, formed from Allen County and Randolph County, and named after John Quincy Adams.
- What is the county seat of Adams County?
- The county seat of Adams County is Decatur.
- Is there an online parcel map for Adams County?
- Yes. Indiana Geographic Information Office (IndianaMap) publishes a parcel map of 20,186 parcels, rated good enough 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 1835 from Allen County and Randolph County. Since then the Atlas of Historical County Boundaries records 1 later change, chiefly involving Allen County and Randolph County.
- Who issues septic and well permits in Adams County?
- The county's page on septic systems and wells: Health department: septic and well.
- 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