Exact federal listing answer
Is Federal Building on the National Register?
Yes · NPS status: Listed
Yes. Reference 74002047 is listed.
Yes. The U.S. National Park Service listed-properties dataset through May 22, 2026 identifies Federal Building as Listed in the National Register of Historic Places under reference 74002047.
Federal statusListed
National Register reference74002047
Listed dateAugust 7, 1974
Property categoryBuilding
Published address526 Water St.
LocalityPort Huron, St. Clair County, Michigan
Significance levelLocal
Published acreage1.1
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: POLITICS/GOVERNMENT, ARCHITECTURE.
Other published names: U.S. Post Office and Custom House.
Same locality
Other released Port Huron records.
Each linked page answers a separate named federal record.