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County · code 39091

Logan CountyOhio

Logan County is a county in Ohio with its seat in Bellefontaine. The county was formed in 1818 and named after Benjamin Logan.

  • Founded1818
  • County seatBellefontaine
  • Named forBenjamin Logan
  • Land area459 sq mi + 8.3 sq mi water
  • Population46,150 2020 Census
  • Parcels mapped37,272 checked 16 October 2026
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Updated

ChampaignHardinUnionShelbyAuglaize Bellefontaine Census outline · seat marked

Where it is

Logan on the map of Ohio

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

Adams CountyAllen CountyAshland CountyAshtabula CountyAthens CountyAuglaize CountyBelmont CountyBrown CountyButler CountyCarroll CountyChampaign CountyClark CountyClermont CountyClinton CountyColumbiana CountyCoshocton CountyCrawford CountyCuyahoga CountyDarke CountyDefiance CountyDelaware CountyErie CountyFairfield CountyFayette CountyFranklin CountyFulton CountyGallia CountyGeauga CountyGreene CountyGuernsey CountyHamilton CountyHancock CountyHardin CountyHarrison CountyHenry CountyHighland CountyHocking CountyHolmes CountyHuron CountyJackson CountyJefferson CountyKnox CountyLake CountyLawrence CountyLicking CountyLorain CountyLucas CountyMadison CountyMahoning CountyMarion CountyMedina CountyMeigs CountyMercer CountyMiami CountyMonroe CountyMontgomery CountyMorgan CountyMorrow CountyMuskingum CountyNoble CountyOttawa CountyPaulding CountyPerry CountyPickaway CountyPike CountyPortage CountyPreble CountyPutnam CountyRichland CountyRoss CountySandusky CountyScioto CountySeneca CountyShelby CountyStark CountySummit CountyTrumbull CountyTuscarawas CountyUnion CountyVan Wert CountyVinton CountyWarren CountyWashington CountyWayne CountyWilliams CountyWood CountyWyandot CountyLogan County Logan
Counties of Ohio · Logan highlighted

History

Formed in 1818 from Champaign County

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

Logan County was created from Champaign County on March 1, 1818. In 1820, Logan lost territory to the creation of Union, Allen, Crawford, Hancock, Hardin, Henry, Putnam, Sandusky, Seneca, and Wood counties, with Hardin remaining attached to Logan for administrative purposes until 1833. Between 1883 and 1888, Logan exchanged small areas with Shelby and Auglaize counties.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries; the 5 that matter most are shown first.

  1. 1818
    Logan County created Logan created from Champaign. Part of Champaign reverted to Non-County Area 9 and was attached to Logan for administrative and judicial purposes.
    from Champaign
    · Ohio Laws 1817, 16th assy., ch. 20, secs. 1, 7/pp. 53, 55; Chase, 3:ch. 415/p. 2127
  2. 1820
    Gained territory Logan gained part of attached Non-County Area 9 and lost to creation of Union. Logan lost the remainder of attached Non-County Area 9 to creation of Allen, Crawford, Hancock, Hardin, Henry, Putnam, Sandusky, Seneca, Union, and Wood. Hardin not fully organized, attached to Logan for administrative and judicial purposes.
    from Unionfrom Allenfrom Crawfordfrom Hancockfrom Hardinfrom Henryfrom Putnamfrom Sanduskyfrom Senecafrom Wood
    · Ohio Laws 1819, 18th assy., loc., chs. 16, 37/pp. 56, 58, 90-92; Chase, 3:chs. 428-429/pp. 2133-2135
  3. 1833
    Changed Hardin fully organized, detached from Logan.
    Hardin
    · Ohio Laws 1832, 31st assy., gen., p. 10; Chase, 3:ch. 479/p. 2147
  4. 1883
    Exchanged territory Logan exchanged small areas with Shelby.
    with Shelby
    · Ohio Laws 1883, 65th assy., adj. sess., p. 324
  5. 1888
    Exchanged territory Logan exchanged small areas with Auglaize.
    with Auglaize
    · Ohio Laws 1888, 68th assy., reg. sess., p. 418
Show all 9 changes (4 more, mostly small adjustments)
  1. 1818
    Logan County created Logan created from Champaign. Part of Champaign reverted to Non-County Area 9 and was attached to Logan for administrative and judicial purposes.
    from Champaign
    · Ohio Laws 1817, 16th assy., ch. 20, secs. 1, 7/pp. 53, 55; Chase, 3:ch. 415/p. 2127
  2. 1820
    Gained territory Logan gained part of attached Non-County Area 9 and lost to creation of Union. Logan lost the remainder of attached Non-County Area 9 to creation of Allen, Crawford, Hancock, Hardin, Henry, Putnam, Sandusky, Seneca, Union, and Wood. Hardin not fully organized, attached to Logan for administrative and judicial purposes.
    from Unionfrom Allenfrom Crawfordfrom Hancockfrom Hardinfrom Henryfrom Putnamfrom Sanduskyfrom Senecafrom Wood
    · Ohio Laws 1819, 18th assy., loc., chs. 16, 37/pp. 56, 58, 90-92; Chase, 3:chs. 428-429/pp. 2133-2135
  3. 1824
    Boundary clarified Boundary between Logan and Union was clarified (no change).
    with Unionno change
    · Ohio Laws 1823, 22d assy., loc., ch. 5/p. 7; Chase, 3:ch. 438/p. 2136
  4. 1833
    Changed Hardin fully organized, detached from Logan.
    Hardin
    · Ohio Laws 1832, 31st assy., gen., p. 10; Chase, 3:ch. 479/p. 2147
  5. 1883
    Boundary clarified Boundary between Logan and Hardin was clarified (no change).
    with Hardinno change
    · Ohio Laws 1883, 65th assy., adj. sess., p. 341
  6. 1883
    Exchanged territory Logan exchanged small areas with Shelby.
    with Shelby
    · Ohio Laws 1883, 65th assy., adj. sess., p. 324
  7. 1886
    Changed Legislature authorized Logan to exchange with Auglaize dependent on local referendum.
    Auglaize
    · Ohio Laws 1886, 67th assy., reg. sess., p. 332
  8. 1887
    Changed Legislature authorized Logan to exchange with Auglaize dependent on local referendum.
    Auglaize
    · Ohio Laws 1887, 67th assy., adj. sess., p. 276
  9. 1888
    Exchanged territory Logan exchanged small areas with Auglaize.
    with Auglaize
    · Ohio Laws 1888, 68th assy., reg. sess., p. 418

Land and parcels

What the maps cover in Logan

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

Logan by the Census

Population
46,150 2020 Census count
Housing units
23,657 2020 Census count
Land area
459 square miles
Water area
8.3 square miles
People per sq mi
101 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

Logan 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 Logan County

When was Logan County founded?
Logan County was founded in 1818, formed from Champaign County, and named after Benjamin Logan.
What is the county seat of Logan County?
The county seat of Logan County is Bellefontaine.
Is there an online parcel map for Logan County?
Yes. Logan County publishes a parcel map of 37,272 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Logan County's boundary or name changed?
Logan County was created in 1818 from Champaign County. Since then the Atlas of Historical County Boundaries records 6 later changes, most of them small boundary adjustments, chiefly involving Auglaize County, Hardin County and Allen County.
Is my lot in a flood zone?
We do not have flood maps for Logan 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