County · code 18115
Ohio CountyIndiana
Ohio County is a county in southeastern Indiana, with its seat in Rising Sun. The county was formed on March 1, 1844, from Dearborn County.
- Founded1844
- County seatRising Sun
- Named forOhio River
- Land area86 sq mi + 1.3 sq mi water
- Population5,940 2020 Census
- Parcels mapped3,523 checked 15 October 2026
Where it is
Ohio 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 1844 from Dearborn County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Ohio County was created from Dearborn County in 1844 but initially remained attached to Dearborn for administrative purposes. The county became fully organized and independent in May 1844, and gained additional land from Dearborn the following year.
- 1844Ohio County created Ohio created from Dearborn; Ohio not fully organized, attached to Dearborn for administrative and judicial purposes. · Ind. Acts 1843, 28th sess., gen., ch. 2, secs. 1, 13/pp. 7, 9
- 1844Changed Ohio fully organized, detached from Dearborn. · Ind. Acts 1843, 28th sess., gen., ch. 2, sec. 4/p. 7
- 1845Gained territory Ohio gained from Dearborn. · Ind. Acts 1844, 29th sess., loc., ch. 230, secs. 1-2/p. 225
Land and parcels
What the maps cover in Ohio
Who publishes each layer, how good it is, and when we last checked.
-
Parcels Good enough
Lot lines and tax-map numbers for 3,523 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, 3,238 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
Ohio 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.
Records
Zoning and code
County government
- County government
The official website of Ohio County.
See your own lot on these maps
Open Ohio 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 Ohio County
- When was Ohio County founded?
- Ohio County was founded in 1844, formed from Dearborn County, and named after Ohio River.
- What is the county seat of Ohio County?
- The county seat of Ohio County is Rising Sun.
- Is there an online parcel map for Ohio County?
- Yes. Indiana Geographic Information Office (IndianaMap) publishes a parcel map of 3,523 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Ohio County's boundary or name changed?
- Ohio County was created in 1844 from Dearborn County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Dearborn County.
- Who issues building permits in Ohio County?
- The county's page on building permits: Background checks/Gun Permits/Sheriff Sales. Inside a city or town, ask that city first.
- Is my lot in a flood zone?
- We do not have flood maps for Ohio County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby