- Paul Ecke Poinsettia Ranch, Encinitas2
- Pescadero Creek, about 3 miles northeast of Pescadero on La Honda Road1
- Peter Ahart Ranch, about 1 1/2 miles north and 1 1/4 miles east of Honcut, about 12 miles (air) southeast of Oroville.1
- Peter Ahart Ranch, about 300 yards east of Palermo Honcut Highway, about 2 1/8 miles north of Honcut, about 12 miles south of Oroville.1
- Pickel Meadow 7.5' quad, Central High Sierra Nevada, southeast side of Leavitt Lake.1
- Pilarcitos Creek Canyon4
- Pilarcitos Creek, Santa Cruz Mountains1
- Pin Ck. campground east of Likely1
- Pine Flat Reservoir, 8 miles east of Trimmer Springs Road on Island Park Road, below Driftwood Trailer Park and Campground1
- Pinnacle Peak, Bartlett Mountain1
- Pipe Spring, west side of Big Meadow, Kern Plateau.1
- Placer43
- Placerville, Along the American River1
- Placitos Creek Canyon1
- Plants of Lassen Volcanic National Park, pond north of Summit Lake.1
- Plants of the Salmon Mountains. Between King David Peak & Abbotts Basin.1
- Plumas48
- Point Bonita1
- Point Lobos1
- Point Lobos Cañon, San Francisco County1