A National Historic Landmark. Listed on the National Register of Historic Places in 1979. 11 historic topographic surveys show this location, the earliest from 1916.
One of 73 National Register listings published here for Sonoma County · listed in 1979 · category: Building · a National Historic Landmark.
Sources: the case file at the National Archives · the National Register database, National Park Service
The ground this property stands on, surveyed 78 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.
Regional context, not property-specific evidence. The federal wildfire occurrence database lists 508 fires within 5 miles of Old Post Office between 1992 and 2020, burning about 456 acres in total. None started naturally. 48 were recorded as arson. Distance is straight-line from the map coordinates, so a fire counted here may appear on a neighbouring settlement's page as well.
| Reported cause | Fires |
|---|---|
| Missing data/not specified/undetermined | 259 |
| Equipment and vehicle use | 80 |
| Smoking | 77 |
| Arson/incendiarism | 48 |
| Misuse of fire by a minor | 25 |
| Debris and open burning | 11 |
| Power generation/transmission/distribution | 5 |
| Recreation and ceremony | 3 |
The most recent of them, most recent first, with the day each was reported and the service that recorded it.
| Date | Cause | Size | Reported by | Name on the report |
|---|---|---|---|---|
| 8 September 2008 | Missing data/not specified/undetermined | under an acre | California Department of Forestry & Fire Protection | not named |
| 8 September 2007 | Missing data/not specified/undetermined | 1.0 acres | California Department of Forestry & Fire Protection | not named |
| 8 September 2007 | Missing data/not specified/undetermined | under an acre | California Department of Forestry & Fire Protection | not named |
| 8 September 2005 | Missing data/not specified/undetermined | under an acre | California Department of Forestry & Fire Protection | not named |
| 8 September 1992 | Equipment and vehicle use | 7.0 acres | Sonoma-Lake Napa Unit | RUSSELL |
| 7 September 2009 | Missing data/not specified/undetermined | under an acre | California Department of Forestry & Fire Protection | not named |
| 7 September 2000 | Smoking | under an acre | Sonoma-Lake Napa Unit | NEWMAN |
| 6 September 2009 | Missing data/not specified/undetermined | under an acre | California Department of Forestry & Fire Protection | not named |
Regional context, not property-specific evidence. The federal mineral resources record lists 18 workings within 5 miles of Old Post Office: 8 past producers, 4 producers, 3 unknowns, 2 prospects. 4 still produce. What was taken out: Sand and Gravel, Construction, Stone, Stone, Crushed/Broken, Perlite. Distance is straight-line from the map coordinates, so a quarry counted here may appear on a neighbouring settlement's page as well.
| Where | Site | Commodity | Status | Recorded |
|---|---|---|---|---|
| Stirling | Iron | Unknown | ||
| Unnamed Location | Perlite | Prospect | ||
| Z and G Quarry and Mill | Stone, Dimension | Unknown | ||
| Petaluma Hill Road | Stone, Crushed/Broken | Producer | Sedimentary | |
| Zamaroni Quarry | Stone, Crushed/Broken | Producer | ||
| O Connor | Stone | Producer | ||
| O Connor | Stone | Past Producer | ||
| Unnamed Location | Stone | Occurrence | ||
| Zaney Gravels | Stone | Producer | ||
| Zaney Gravels | Stone | Past Producer |
Regional context, not property-specific evidence. The National Weather Service names Santa Rosa, the town this property stands in, in 13 storm reports between 1996 and 2025: 5 hail, 3 tornado, 2 heavy rain, 2 flood. No death or injury is recorded in these reports. Each account below is quoted exactly as the forecast office filed it, from the NOAA Storm Events Database, and each date opens the federal record of that event.
| When | Event | Place named | Harm | What the report says |
|---|---|---|---|---|
| December 1998 | Tornado (F1) | Santa Rosa | $1,000,000 | no account filed |
| March 2011 | Tornado (EF1) | Santa Rosa | $50,000 | An EF1 tornado completely destroyed a metal building and severely bent a metal gate. |
| December 2004 | Tornado (F0) | Santa Rosa | $3,000 | Brief F0 tornado touchdown in the NW portion of the city of Santa Rosa, picked up cinder blocks and threw them into the roof of a house, putting holes in the roof. Law enforcement officer reported swirl of debris passed over his car. |
| November 2024 | Heavy Rain | Santa Rosa | $10 | A total of 12.47 of rain was observed at the Santa Rosa COOP station from November 19 at 4 PM to November 22 at 4 PM. This marks the wettest three-day period on record for the station. |
| November 2025 | Flood | Santa Rosa | - | Roadway flooding was reported on the connectors between eastbound California Highway 12 and northbound US Highway 101 and westbound Highway 12 to southbound Highway 101. |
| March 2021 | Hail | Santa Rosa | - | Santa Rosa Fire Department reports multiple vehicle accidents on hwy 101 due to accumulating small hail. |
| August 2020 | Hail | Santa Rosa | - | Video on twitter showing small hail in Santa Rosa. |
| January 2017 | Flood | Santa Rosa | - | Freeway shutdown at Hwy 101N due to flooding. |
| February 2018 | Hail | Santa Rosa | - | no account filed |
| January 2018 | Hail | Santa Rosa | - | no account filed |
| June 2017 | Hail | Santa Rosa | - | no account filed |
| December 2002 | Heavy Rain | Santa Rosa | - | no account filed |
| February 1996 | Flash Flood | Santa Rosa | - | no account filed |
United States Geological Survey topographic sheets whose coverage includes this point. Matched by taking the coordinate the National Park Service records for this property, then testing that coordinate against the published boundary of every sheet.
Other National Register properties close enough to walk or drive between, ordered by distance from this one. Both positions come from the same geocoding pass that matched these properties to their map sheets.
| Photograph | Property | Distance | Listed |
|---|---|---|---|
 | Sweet House | 0.2 miles | 1988 |
 | Hotel La Rose | 0.3 miles | 1978 |
 | W. H. Lumsden House | 0.3 miles | 1983 |
 | Rosenburg's Department Store | 0.3 miles | 1994 |
 | Cnopius House | 0.3 miles | 1982 |
 | Railroad Square District | 0.4 miles | 2025 |
| National Archives record | The nomination case file for reference 79000559 in Record Group 79. |
| Sonoma County | All 73 listed properties in this county. |
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