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County · code 39013

Belmont CountyOhio

Belmont County is in southeastern Ohio, with its county seat at St. Clairsville. The county was created in 1801.

  • Founded1801
  • County seatSt. Clairsville
  • Land area532 sq mi + 9.2 sq mi water
  • Population66,497 2020 Census
  • Parcels mapped65,892 checked 16 October 2026
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Updated

HarrisonMonroeMarshall, WVOhio, WVJefferson St. Clairsville Census outline · seat marked

Where it is

Belmont 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 · Belmont highlighted

History

Formed in 1801 from Jefferson County and Washington County

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

Belmont County was created on September 7, 1801, by the Northwest Territory from Jefferson County and Washington County. When Ohio became a state in 1803, Belmont became one of its counties. The county lost territory in 1810 with the creation of Guernsey County, and again in 1813 with the creation of Monroe County, which was initially attached to Belmont for administrative purposes until it was fully organized in 1815.

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

  1. 1801
    Belmont County created Belmont created by the Northwest Territory from Jefferson and Washington.
    from Jeffersonfrom Washington
    · Terr. Papers U.S., 3:528; Chase, 3:ch. 341/p. 2098
  2. 1803
    Became part of Ohio Belmont 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. 1810
    Lost territory Belmont lost to creation of Guernsey.
    to Guernsey
    · Ohio Laws 1809, 8th assy., ch. 20, secs. 1-2, 4/pp. 65-67; Chase, 3:ch. 380/p. 2112
  4. 1813
    Lost territory Belmont lost to creation of Monroe; Monroe not fully organized, part attached to Belmont for administrative and judicial purposes.
    to Monroe
    · Ohio Laws 1812, 11th assy., ch. 25/p. 57; Chase, 3:ch. 396/p. 2117
  5. 1815
    Changed Monroe fully organized, detached from Belmont.
    Monroe
    · Ohio Laws 1814, 13th assy., ch. 36, secs. 1, 2, 6/pp. 128-129; Chase, 3:ch. 402/pp. 2120-2121

Land and parcels

What the maps cover in Belmont

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

Belmont by the Census

Population
66,497 2020 Census count
Housing units
31,618 2020 Census count
Land area
532 square miles
Water area
9.2 square miles
People per sq mi
125 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

Belmont County's official site

We have found the county's site but not its offices yet; start there.

County government

See your own lot on these maps

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Questions

Common questions about Belmont County

When was Belmont County founded?
Belmont County was founded in 1801, formed from Jefferson County and Washington County.
What is the county seat of Belmont County?
The county seat of Belmont County is St. Clairsville.
Is there an online parcel map for Belmont County?
Yes. Belmont County publishes a parcel map of 65,892 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Belmont County's boundary or name changed?
Belmont County was created in 1801 from Jefferson County and Washington County. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Monroe County and Guernsey County.
Is my lot in a flood zone?
We do not have flood maps for Belmont 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