Categories and articles related to notable musical groups presently or previously from Philadelphia and its surrounding Delaware Valley counties. For individual musicians, see Category:Musicians from Philadelphia.

• Atlantic County, New Jersey,
• Burlington County, New Jersey,
• Camden County, New Jersey,
• Cape May County, New Jersey,
• Gloucester County, New Jersey,
• Bucks County, Pennsylvania,
• Berks County, Pennsylvania,
• Chester County, Pennsylvania,
• Cumberland County, Pennsylvania,
• Delaware County, Pennsylvania,
• Montgomery County, Pennsylvania,
• Philadelphia County, Pennsylvania,
• New Castle County, Delaware,
• Cecil County, Maryland, and
• Salem County, New Jersey.