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Delaware County, Pennsylvania | |||
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A collage of notable places in Delaware County | |||
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Location in the state of Pennsylvania | |||
Pennsylvania's location in the U.S. | |||
Founded | September 26, 1789 | ||
Named for | Delaware River | ||
Seat | Media | ||
Largest city | Upper Darby | ||
Area | |||
• Total | 191 sq mi (495 km2) | ||
• Land | 184 sq mi (477 km2) | ||
• Water | 6.8 sq mi (18 km2), 3.5% | ||
Population (Est.) | |||
• (2018) | 564,751 | ||
• Density | 3,065/sq mi (1,183/km²) | ||
Website | www.co.delaware.pa.us | ||
Footnotes: For infobox source see[1] |