Sax
- San Antonio River - California
- San Antonio River - Texas
- San Benito River - California
- San Bernard River - Texas
- San Diego River - California
- San Francisco River - New Mexico, Arizona
- San Gabriel River - California
- San Gabriel River - Texas
- San Gorgonio River - California
- San Jacinto River - California
- San Jacinto River - Texas
- San Joaquin River - California
- San Juan River - Colorado, New Mexico, Utah
- San Lorenzo River - California
- San Luis Rey River - California
- San Marcos River - Texas
- San Miguel River - Colorado
- San Pedro River - Arizona
- San Rafael River - Utah
- San Saba River - Texas
- Sand Fork - West Virginia
- Sand Hill River - Minnesota
- Sand River - Wisconsin
- Sandusky River - Ohio
- Sandy Creek - Ohio
- Sandy Creek - Pennsylvania
- Sandy Creek - West Virginia
- Sandy River - Oregon
- Sandy River - South Carolina
- Sangamon River - Illinois
- Sanpoil River - Washington
- Santa Ana River - California
- Santa Clara River - California
- Santa Cruz River - Arizona
- Santa Fe River - Florida
- Santa Fe River - New Mexico
- Santa Margarita River - California
- Santa Maria River - Arizona
- Santa Ynez River - California
- Santee River - South Carolina
- Santiam River - Oregon
- Santuit River - Massachusetts
- Saranac River - New York
- Sassafras River - Delaware, Maryland
- Satilla River - Georgia
- Satucket River - Massachusetts
- Saugatuck River - Connecticut
- Saugatucket River - Rhode Island
- Saugus River - Massachusetts
- Sauk River - Minnesota
- Sauk River - Washington
- Savage River - Maryland
- Savannah River - Georgia, South Carolina
- Saw Kill River - New York
- Saw Mill River - New York
- Sawyer River - New Hampshire
- Saxtons River - Vermont
Read more about this topic: List Of Rivers Of The United States: S, San