County · code 40041
Delaware CountyOklahoma
Delaware County is a county in northeastern Oklahoma, established in 1907 with its seat in Jay.
- Founded1907
- County seatJay
- Named forLenape
- Land area738 sq mi + 54 sq mi water
- Population40,397 2020 Census
Where it is
Delaware on the map of Oklahoma
Oklahoma has 77 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Founded in 1907
An old deed may name a county that no longer exists, or a boundary that has since moved.
Delaware County was created on November 16, 1907, from former Indian Territory. The county is named after the Lenape people.
- 1907Delaware County created Delaware created from former Indian Territory. · Okla. Constitution [1907], art. 17, sec. 8; Swindler, 8:145
Land and parcels
What the maps cover in Delaware
Who publishes each layer, how good it is, and when we last checked.
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Parcels Missing
No public parcel map found for Delaware County yet. Lot lines and owners of record are kept by the assessor's office.
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Address points Missing
No public address points layer found for Delaware County yet.
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Buildings Reference
Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026
- 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
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.
County government
- County government
The official website of Delaware County.
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.
Questions
Common questions about Delaware County
- When was Delaware County founded?
- Delaware County was founded in 1907, and named after Lenape.
- What is the county seat of Delaware County?
- The county seat of Delaware County is Jay.
- Is there an online parcel map for Delaware County?
- Not that we have found yet. Lot lines and owners of record are kept by the assessor's office. When a public parcel map appears, it shows here.
- Has Delaware County's boundary or name changed?
- Delaware County was created in 1907. The Atlas of Historical County Boundaries records no boundary change since.
- 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