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County · code 39041

Delaware CountyOhio

Delaware County is a county in Ohio, with its seat in Delaware.

  • Founded1808
  • County seatDelaware
  • Named forLenape
  • Land area443 sq mi + 14 sq mi water
  • Population214,124 2020 Census
  • Parcels mapped103,042 checked 15 October 2026
Open the free map Click any parcel in Delaware County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

FranklinMorrowMarionUnion Delaware Census outline · seat marked

Where it is

Delaware 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 · Delaware highlighted

History

Formed in 1808 from Franklin County

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

Delaware County was created from Franklin County on April 1, 1808, and named after the Lenape. The county lost territory on multiple occasions: in 1815 to Huron, in 1820 to Union, Crawford, Hancock, Hardin, and Marion, and in 1848 to Morrow and Marion.

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

  1. 1808
    Delaware County created Delaware created from Franklin.
    from Franklin
    · Ohio Laws 1807, 6th assy., chs. 10, 45/pp. 29, 152; Chase, 3:ch. 365/p. 2107
  2. 1809
    Changed Northern part of Franklin reverted to Non-County Area 5 and was attached to Delaware for administrative and judicial purposes.
    Franklin
    · Ohio Laws 1808, 7th assy., ch. 27/p. 156; Chase, 3:ch. 376/p. 2110
  3. 1815
    Lost territory Non-County Area 5 attached to Delaware lost to creation of Non-County Area 8 which was attached to Huron "for judicial purposes."
    to Huron
    · Ohio Laws 1814, 13th assy., ch. 33/p. 113; Chase, 3:ch. 401/p. 2120
  4. 1820
    Lost territory Delaware lost to creation of Union; Delaware lost all of attached Non-County Area 5 to creation of Crawford, Hancock, Hardin, Marion, and Union. Crawford and Marion not fully organized, both attached to Delaware for administrative and judicial purposes.
    to Unionto Crawfordto Hancockto Hardinto Marion
    · Ohio Laws 1819, 18th assy., loc., chs. 16, 37/pp. 56-59, 90-93; Chase, 3:chs. 428-429/pp. 2133-2135
  5. 1824
    Changed Part of Crawford detached from Delaware, attached to Seneca "for judicial purposes."
    CrawfordSeneca
    · Ohio Laws 1823, 22d assy., loc., chs. 34, 55/pp. 49, 88; Chase, 3:chs. 442, 445/pp. 2137-2139
  6. 1824
    Changed Marion fully organized, detached from Delaware; Crawford detached from Delaware, attached to Marion "for judicial purposes."
    MarionCrawford
    · Ohio Laws 1823, 22d assy., loc., ch. 33/p. 48; Chase, 3:ch. 441/p. 2137
  7. 1848
    Lost territory Delaware lost to creation of Morrow and lost to Marion.
    to Morrowto Marion
    · Ohio Laws 1847, 46th assy., loc., secs. 1, 4/pp. 233-234

Land and parcels

What the maps cover in Delaware

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

Delaware by the Census

Population
214,124 2020 Census count
Housing units
81,854 2020 Census count
Land area
443 square miles
Water area
14 square miles
People per sq mi
483 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.

Records

Zoning and code

County government

See your own lot on these maps

Open Delaware 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 Delaware County

When was Delaware County founded?
Delaware County was founded in 1808, formed from Franklin County, and named after Lenape.
What is the county seat of Delaware County?
The county seat of Delaware County is Delaware.
Is there an online parcel map for Delaware County?
Yes. A public source publishes a parcel map of 103,042 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Delaware County's boundary or name changed?
Delaware County was created in 1808 from Franklin County. Since then the Atlas of Historical County Boundaries records 6 later changes, chiefly involving Crawford County, Marion County and Franklin County.
Is my lot in a flood zone?
We do not have flood maps for Delaware 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