- Portage1
- Poweshiek1
- Progreso1
- Rhode Island1
- Right bank of Current River, just above lake level at north end of Onion Lake, 1.5 km. west of H. 527, 25 km. NNE of Thunder Bay City1
- Robinson's Ford1
- Ross1
- Sag pond about one mile east of Mussel Rock1
- San Mateo1
- Sanford1
- Santa Cruz1
- Schell-Osage Wildlife Refuge1
- Seattle, On the Campus of the University of Washington1
- Sharon, Beckers Lake1
- Shore of Clark Fork, Rest Area on US 10, 3 miles west of Alberton1
- Sicily Island hills, along Big Creek and ridge leading to it from north, ca, 6 miles west of Sicily Island town1
- Siskiyou1
- Sonoma1
- South shore of Rush Lake1
- Spring Creek valley1