Delaware County Court House, Media, Pa.
My native county, though I spend little time there now. Before 1796 what is now Delaware County was the southeastern third or so of Chester County, one of the five original seventeenth-century counties of Pennsylvania, with the county seat at Chester, the First City of Pennsylvania. (William Penn planned Philadelpha there.) Because of the distance from Chester to the farther reaches, the county was divided and the southeast portion, which includes Chester, was named Delaware County. (It sits on the Delaware River between the City of Philadelpia and the State of Delaware -- no imagination was consumed in naming this county.) The seat was eventually moved to a centrally located burg named Providence, promptly renamed Media to announce its central location for all Delaware Countians. The memory of the original name is preserved in the adjacent townships of Upper Providence and Nether Providence, and a couple of Providence Roads.
The 1724 predecessor courthouse, located in Chester, is said to be the oldest public building still standing in the United States. flickr.com/photos/48878663@N00/262630309/