Listed on the National Register of Historic Places in 1973.
One of 411 National Register listings published here for New Castle County · listed in 1973 · category: Building.
Sources: the case file at the National Archives · the National Register database, National Park Service · the Wikipedia article
Regional context, not property-specific evidence. The federal mineral resources record lists 1 working within 5 miles of Dilworth House: 1 plant. All of them still produce. What was taken out: Sulfur. 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 |
|---|---|---|---|---|
| Delaware Plant Getty | Sulfur | Plant |
Regional context, not property-specific evidence. The National Weather Service names Port Penn, the town this property stands in, in 8 storm reports between 2003 and 2024: 5 thunderstorm wind, 1 lightning, 1 flash flood, 1 funnel cloud. 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 |
|---|---|---|---|---|
| July 2003 | Lightning | Port Penn | $100,000 | no account filed |
| July 2024 | Thunderstorm Wind | Port Penn | - | Reports of tree damage with debris blocking portions of Dutch Neck Road and Thorntown Road northwest of Port Penn. Power outages also reported in the area. Time estimated. |
| June 2021 | Funnel Cloud | Port Penn | - | A funnel cloud was observed near Port Penn. Photos showed it extended about halfway to the ground. This was likely a non-mesocyclonic funnel associated with interactions between new updrafts and old outflow boundaries. Time estimated from radar and public reports. |
| April 2019 | Thunderstorm Wind | Port Penn | - | A downed tree and utility pole led to the closure of the intersection of West Market Street and Delaware City Port Penn Road. The time of the event was estimated from radar. |
| June 2016 | Thunderstorm Wind | Port Penn | - | Trees and wires down. |
| June 2016 | Thunderstorm Wind | Port Penn | - | Several trees downed due to thunderstorm winds. |
| June 2013 | Flash Flood | Port Penn | - | Thunderstorms with heavy rain caused flash flooding in Port Penn. Delaware State Route 9 was closed and several cars had to be abandoned. No serious injuries were reported. |
| August 2004 | Thunderstorm Wind | Port Penn | - | no account filed |
No historic map-sheet match is published for this property yet. That does not mean no map exists. This record needs a coordinate-quality review before it can be joined to a sheet boundary. Browse the county's mapped places while that work is pending.
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 |
|---|---|---|---|
 | John B. Nelson House | 0.3 miles | 1978 |
| Robert Grose House | 0.6 miles | 2001 | |
 | Hazel Glen | 0.7 miles | 1978 |
 | Cleaver House | 0.7 miles | 1985 |
 | Ashton Historic District | 1.4 miles | 1978 |
 | Augustine Beach Hotel | 1.5 miles | 1973 |
| National Archives record | The nomination case file for reference 73000538 in Record Group 79. |
| Wikipedia article | Community-written account of this property, licensed CC BY-SA. |
| New Castle County | All 411 listed properties in this county. |
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