| Key | Value |
| addr:city | Key West |
| addr:housenumber | 281 |
| addr:postcode | 33040 |
| addr:state | FL |
| addr:street | Front Street |
| alt_name | Old 91 |
| building | yes |
| check_date | 2023-10-16 |
| description | Custom House was the site of many significant historical events, most notably the inquiry into the sinking of the USS Maine in Havana harbor in 1898. Customs, Postal Service, and U.S. District courts relocated in 1932. Transferred to the Navy in 1932. |
| heritage | 2 |
| heritage:operator | nrhp |
| heritage:website | https://www.nps.gov/subjects/nationalregister/index.htm |
| historic | maritime |
| nrhp:criteria | (A), (C)) |
| nrhp:inscription_date | 1973-09-20 |
| old_name:1891-1932 | Post Office and Custums House |
| old_name:1932-1972 | Naval Administration Building |
| protection_title | Key West Art & Historical Society |
| ref:nrhp | 73000587 |
| source_ref | https://catalog.archives.gov/id/77843297 |
| start_date | 1891 |
| tourism | museum |
| website | https://www.kwahs.org/museums/custom-house/visit |
| wikidata | Q7084773 |
| wikipedia | en:Old Post Office and Customshouse (Key West, Florida) |