Exact federal listing answer
Is Osbornedale on the National Register?
Yes · NPS status: Listed
Yes. Reference 86001256 is listed.
Yes. The U.S. National Park Service listed-properties dataset through May 22, 2026 identifies Osbornedale as Listed in the National Register of Historic Places under reference 86001256.
Federal statusListed
National Register reference86001256
Listed dateJune 13, 1986
Property categoryBuilding
Published address500 Hawthorne Ave.
LocalityDerby, New Haven County, Connecticut
Significance levelLocal
Published acreage8
Exact answer boundaryThis confirms the named federal record only.
It does not prove that another address lies inside this property or district, establish local landmark status, decide preservation review, define a legal boundary, or describe ownership or current condition.
Why the wording is date-boundedThe answer reflects the NPS dataset published through May 22, 2026 and a live NPS GIS Listed-status cross-check made September 20, 2026. NPS notes that spatial points and polygons may need correction and are not legal documents.
Additional published fields
Areas of significance: COMMERCE, ARCHITECTURE.
Other published names: Osborne Homestead Museum.
Same locality
Other released Derby records.
Each linked page answers a separate named federal record.