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County · code 39059

Guernsey CountyOhio

Guernsey County is a county in Ohio, with its seat in Cambridge. It was created in 1810 from Belmont and Muskingum counties and named after Guernsey.

  • Founded1810
  • County seatCambridge
  • Named forGuernsey
  • Land area522 sq mi + 6.1 sq mi water
  • Population38,438 2020 Census
  • Parcels mapped40,753 checked 15 October 2026
Open the free map Click any parcel in Guernsey County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

NobleMuskingumHarrisonCoshoctonBelmont Cambridge Census outline · seat marked

Where it is

Guernsey 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 · Guernsey highlighted

History

Formed in 1810 from Belmont County and Muskingum County

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

Guernsey County was created from Belmont and Muskingum in 1810. Between 1813 and 1851, parts of Guernsey County were lost to the creation of Monroe County, Morgan County, and Noble County.

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

  1. 1810
    Guernsey County created Guernsey created from Belmont and Muskingum.
    from Belmontfrom Muskingum
    · Ohio Laws 1809, 8th assy., ch. 20, secs. 1-2, 4/pp. 65-67; Chase, 3:ch. 380/p. 2112
  2. 1813
    Lost territory Guernsey lost to creation of Monroe; Monroe not fully organized, part attached to Guernsey for administrative and judicial purposes.
    to Monroe
    · Ohio Laws 1812, 11th assy., ch. 25/p. 57; Chase, 3:ch. 396/p. 2117
  3. 1815
    Changed Monroe fully organized, detached from Guernsey.
    Monroe
    · Ohio Laws 1814, 13th assy., ch. 36, secs. 1, 2, 6/pp. 128-129; Chase, 3:ch. 402/pp. 2120-2121
  4. 1817
    Lost territory Guernsey lost to creation of Morgan; Morgan not fully organized, part attached to Guernsey for administrative and judicial purposes.
    to Morgan
    · Ohio Laws 1817, 16th assy., ch. 18/p. 42; Chase, 3:ch. 414/p. 2126
  5. 1819
    Changed Morgan fully organized, detached from Guernsey.
    Morgan
    · Ohio Laws 1818, 17th assy., ch. 6, secs. 1, 4/pp. 7-9; Chase, 3:ch. 421/pp. 2129-2130
  6. 1851
    Lost territory Guernsey lost to creation of Noble.
    to Noble
    · Ohio Laws 1850, 49th assy., loc., secs. 1-2, 4, 10/pp. 137-139

Land and parcels

What the maps cover in Guernsey

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

Guernsey by the Census

Population
38,438 2020 Census count
Housing units
19,009 2020 Census count
Land area
522 square miles
Water area
6.1 square miles
People per sq mi
74 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

Guernsey 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 Guernsey County

When was Guernsey County founded?
Guernsey County was founded in 1810, formed from Belmont County and Muskingum County, and named after Guernsey.
What is the county seat of Guernsey County?
The county seat of Guernsey County is Cambridge.
Is there an online parcel map for Guernsey County?
Yes. A public source publishes a parcel map of 40,753 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Guernsey County's boundary or name changed?
Guernsey County was created in 1810 from Belmont County and Muskingum County. Since then the Atlas of Historical County Boundaries records 5 later changes, chiefly involving Monroe County, Morgan County and Noble County.
Is my lot in a flood zone?
We do not have flood maps for Guernsey 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