Spatial Coverage
- Philadelphia Metropolitan Area1
- Philadelphia Metropolitan Area (Pa.)1
- Pike County (Ky.)1
- Pitkin County (Colo.)1
- Pittsfield Region (Mass.)1
- Pittsylvania County (Va.)1
- Pratt County (Kan.)1
- Preston County (W. Va.)1
- Prince Edward County (Va.)1
- Providence River (R.I.)1
- Prowers County (Colo.)1
- Puget Sound Region (Wash.)1
- Pulaski County (Va.)1
- Red Mountain Mining District (Colo.)1
- Republican River (Neb. and Kan.)1
- Revere1
- Revere (Mass.)1
- Rhea County (Tenn.)1
- Rhode Island1
- Riverside County1
