Contiguous to Philadelphia County, Delaware County was formed from Chester County in 1789.
St. David’s – Radnor
RESEARCH RESOURCES
- GSP Delaware County Repository Guide
- Chadds Ford Historical Society
- Delaware County Archives
- Delaware County History in Pictures
- Delaware County PA GenWeb Project
- Delaware County History
- Friends of the 1799 Lazaretto
- Radnor Historical Society
- Tinicum Township Historical Society
