Delaware Boundary Markers

Listed on the National Register of Historic Places in 1975.

From the record

“The Delaware Boundary Markers historic district is located along the state boundary lines between Delaware and Maryland, and between Delaware and Pennsylvania. The district includes 94 contributing sites along the Mason-Dixon line and includes the Transpeninsular Line, Post Marked West site, Tangent Line, the Arc Corner, and the Twelve-Mile Circle.”
Wikipedia article Delaware Boundary Markers, CC BY-SA 4.0.

One of 136 National Register listings published here for Kent County · listed in 1975 · category: District.

Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service

The listing

Address. State boundary lines between DE-MD/DE-PA, Not Applicable, 19901
When was it listed? February 1975
Category. district
Census division. Dover
National Register reference number. 75002101 - the number the National Park Service assigned this property when it was listed, and the key its nomination file is catalogued under at the National Archives.

Fires near this property

25 since 1995

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 25 fires within 5 miles of Delaware Boundary Markers between 1995 and 2014, burning about 2,212 acres in total. 5 started naturally. 1 was 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	16
Natural	5
Recreation and ceremony	2
Debris and open burning	1
Arson/incendiarism	1

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
31 August 2002	Natural	under an acre	Delaware State Fire Marshal's Office	not named
26 August 2002	Natural	1.0 acres	Delaware State Fire Marshal's Office	not named
25 August 2002	Natural	under an acre	Delaware State Fire Marshal's Office	not named
23 August 2002	Natural	under an acre	Delaware State Fire Marshal's Office	not named
23 August 2002	Natural	1.0 acres	Delaware State Fire Marshal's Office	not named
22 August 2002	Missing data/not specified/undetermined	under an acre	Delaware State Fire Marshal's Office	not named
4 June 2002	Missing data/not specified/undetermined	under an acre	Delaware State Fire Marshal's Office	not named
3 June 2002	Missing data/not specified/undetermined	under an acre	Delaware State Fire Marshal's Office	not named

Every fire recorded in Kent County

Mines and quarries near this property

6 within 5 miles

Regional context, not property-specific evidence. The federal mineral resources record lists 6 workings within 5 miles of Delaware Boundary Markers: 3 past producers, 3 producers. 3 still produce. What was taken out: Sand and Gravel, Construction. Distance is straight-line from the map coordinates, so a quarry counted here may appear on a neighbouring settlement's page as well.

Site	Commodity	Status	Recorded
Dover Equip. Co. Dredge No. 7	Sand and Gravel, Construction	Producer
George Nashold Sand and Gravel Pit	Sand and Gravel, Construction	Past Producer	Sedimentary
George Nashold Sand and Gravel Pit	Sand and Gravel, Construction	Producer
St Jones River Gravel Co Pit & Mill	Sand and Gravel, Construction	Past Producer	Sedimentary
Tarburton Pit	Sand and Gravel, Construction	Past Producer	Sedimentary
Tarburton Pit	Sand and Gravel, Construction	Producer

Every working recorded in Kent County

Map coverage status

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.

Listed places nearby

6 within 8 miles

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.

Property	Distance	Listed
Logan School House K-834	2.1 miles	1979
Cherbourg Round Barn	2.4 miles	1978
Jonathan Woodley House	2.6 miles	1982
Elizabeth Stubbs House	2.7 miles	1982
Little Creek Methodist Church	2.7 miles	1982
Old Stone Tavern	2.7 miles	1973

Sources for this property

National Archives record	The nomination case file for reference 75002101 in Record Group 79.
Wikipedia article	Community-written account of this property, licensed CC BY-SA.
Kent County	All 136 listed properties in this county.

Provenance

Listing record. National Park Service National Register of Historic Places, listed-properties dataset, current to 2026-05-22.
Map join. Address geocoded through the United States Census geocoder, then tested against the published boundary of every sheet in the USGS Historical Topographic Map Collection.
How this page is made. Listing fields come from federal records; map-sheet coverage is a labelled coordinate-to-boundary calculation, not a source-field claim.
Wildfire. Short, Karen C. 2022. Spatial wildfire occurrence data for the United States, 1992-2020 [FPA_FOD_20221014]. 6th Edition. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2013-0009.6 Collected with United States Government funding and usable without additional permissions or fees.
Mines and quarries. USGS Mineral Resources Data System (MRDS) https://mrdata.usgs.gov/mrds/ A work of the United States government, no copyright under 17 U.S.C. 105.