Northridge, Delaware

Matched by testing this settlement's coordinate against the published boundary of every sheet in the United States Geological Survey's historical collection. Each opens the scanned sheet at the Survey.

• 1899 USGS Dover quadrangle1:125000, 2 printings
• 1906 USGS Dover quadrangle1:125000, 3 printings
• 1920 USGS Dover quadrangle1:125000
• 1926 USGS Wyoming quadrangle1:48000
• 1930 USGS Wyoming quadrangle1:62500
• 1931 USGS Wyoming quadrangle1:62500, 2 printings
• 1946 USGS Wilmington quadrangle1:250000, 2 printings
• 1955 USGS Wilmington quadrangle1:250000
• 1956 USGS Dover quadrangle1:24000, 3 printings
• 1957 USGS Wilmington quadrangle1:250000, 2 printings
• 1959 USGS Wilmington quadrangle1:250000, 3 printings
• 1966 USGS Wilmington quadrangle1:250000, 4 printings
• 1972 USGS Wilmington quadrangle1:250000, 2 printings
• 1984 USGS Dover quadrangle1:100000
• 1993 USGS Dover quadrangle1:24000

Regional context, not property-specific evidence. The federal mineral resources record lists 1 working within 5 miles of Northridge: 1 producer. All of them 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.

Every working recorded in Kent County

The eight closest, with where each one stands in the county. Distances are straight-line, computed from the Geographic Names Information System coordinates.

This settlement is recorded in the Geographic Names Information System as feature 2400404. The sheet list is computed by point-in-boundary test against the United States Geological Survey's historical topographic inventory. Both are works of the United States government and carry no copyright under 17 U.S.C. 105.

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.