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County · code 39025

Clermont CountyOhio

Clermont County, Ohio, is a county in southwestern Ohio with its seat in Batavia. It was created in 1800 from Hamilton County and became a county in the state of Ohio in 1803.

  • Founded1800
  • County seatBatavia
  • Land area453 sq mi + 7.7 sq mi water
  • Population208,601 2020 Census
  • Parcels mapped100,043 checked 15 October 2026
Open the free map Click any parcel in Clermont County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

Campbell, KYBrownBracken, KYWarrenPendleton, KYHamiltonClinton Batavia Census outline · seat marked

Where it is

Clermont on the map of Ohio

Ohio has 88 counties and county equivalents, each with its own records office. Shapes with a page are links.

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Counties of Ohio · Clermont highlighted

History

Formed in 1800 from Hamilton County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Clermont County was created by the Northwest Territory from Hamilton County on December 6, 1800, and officially became a county in the state of Ohio on March 1, 1803. Between 1805 and 1818, the county lost territory with the creation of Highland County and Brown County.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1800
    Clermont County created Clermont created by the Northwest Territory from Hamilton.
    from Hamilton
    · Terr. Papers U.S., 3:526; Chase, 3:ch. 339/p. 2097
  2. 1803
    Became part of Ohio Clermont became a county in the state of Ohio. · U.S. Stat., vol. 2, ch. 40 [1802], secs. 1-3/pp. 173-174; Van Zandt, 112
  3. 1805
    Lost territory Clermont lost to creation of Highland.
    to Highland
    · Ohio Laws 1804, 3d assy., ch. 60, sec. 1/p. 256; Chase, 3: ch. 350/p. 2102
  4. 1818
    Lost territory Clermont lost to creation of Brown.
    to Brown
    · Ohio Laws 1817, 16th assy., ch. 12, secs. 1, 6/pp. 29, 31; Chase, 3:ch. 412/pp. 2124-2125
  5. 1859
    Changed Legislature authorized Clermont to gain small area from Warren dependent on local referendum.
    Warren
    · Ohio Laws 1859, 53d assy., 2d sess., loc., p. 296

Land and parcels

What the maps cover in Clermont

Who publishes each layer, how good it is, and when we last checked.

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

Clermont by the Census

Population
208,601 2020 Census count
Housing units
86,363 2020 Census count
Land area
453 square miles
Water area
7.7 square miles
People per sq mi
461 population ÷ land area

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.

Permits

County government

See your own lot on these maps

Open Clermont 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.

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Questions

Common questions about Clermont County

When was Clermont County founded?
Clermont County was founded in 1800, formed from Hamilton County.
What is the county seat of Clermont County?
The county seat of Clermont County is Batavia.
Is there an online parcel map for Clermont County?
Yes. Clermont County publishes a parcel map of 100,043 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Clermont County's boundary or name changed?
Clermont County was created in 1800 from Hamilton County. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Brown County, Highland County and Warren County.
Who issues building permits in Clermont County?
The county's page on building permits: Permit Central/Building Inspection. Inside a city or town, ask that city first.
Is my lot in a flood zone?
We do not have flood maps for Clermont County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door