1850 Atlas
| Name | What | Place | Pop | Other |
| Sabatus | PO | Lincoln Co, ME | ||
| Sabillisville | PT | Frederick Co, VA | ||
| Sabina | PV | Richland twp, Clinton Co, OH | ||
| Sabine | PT | Sabine Co, AR (no such Co in AR) | ||
| Sabine City | PO | Jefferson Co, TX | ||
| Sabine Town | PO | Sabine Co, TX | ||
| Sabinsville | PO | Tioga Co, PA | ||
| Sabougly | PO | Yallabusha Co, MS | ||
| Sabula | PO | Jackson Co, IA | ||
| Sacarappa | PV | Westbrook twp, Cumberland Co, ME | water by Presumpscot river | |
| Sachem's Head | V | Guilford twp, New Haven Co, CT | ||
| Sackett's | PO | Macomb Co, MI | ||
| Sackett's Harbor | PV | Houndsfield twp, Jefferson Co, NY | water by Black river bay | |
| Saco | PT | York Co, ME | 5,801 | water by Saco river |
| Sacramento | City | Sacramento Co, CA | 8,000 | seat of justice, water by Sacramento river |
| Sacramento | PO | Marquette Co, WI | ||
| Sacton | PO | Clark Co, IL | ||
| Saddle River | T | Bergen Co, NJ | 823 | water by Saddle & Passaic rivers, Singac brook |
| Sadsbury | T | Lancaster Co, PA | 1,529 | water by Octarara creek |
| Sadsbury | T | Crawford Co, PA | 982 | |
| Sadsbury | PT | Chester Co, PA | 2,767 | water by Octarara creek & west branch Brandywine river |
| Sadsburyville | PO | Sadsbury twp, Chester Co, PA | ||
| Saegerstown | PO | Crawford Co, PA | ||
| Saegersville | PO | Lehigh Co, PA | ||
| Safe Harbor | PO | Lancaster Co, PA | ||
| Sage Hill | PO | Graves Co, KY | ||
| Sage's Ferry | PO | Jackson Co, IN | ||
| Sageville | PO | Hamilton Co, NY | ||
| Sageville | PO | Lauderdale Co, MS | ||
| Sag Harbor | PV | East & West Hamptons twp, Suffolk Co, Long Island, NY | water by Sag Harbor bay | |
| Sagg Village | V | South Hampton twp, Suffolk Co, Long Island, NY | ||
| Saginaw | PT, CH | Saginaw Co, MI | 917 | seat of justice, water by Saginaw river |
| Sago | PO | Lewis Co, VA | ||
| Sagon | PO | Du Page Co, IL | ||
| Sail Creek | PO | Hamilton Co, TN | ||
| Sailor's Rest | PO | Montgemery Co, TN |