1850 Atlas
| Name | What | Place | Pop | Other |
| Fort Adams | PV | Wilkinson Co, MS | ||
| Fort Ann | PT | Washington Co, NY | 3,383 | water by Wood creek, Lake George & Champlain canal |
| Fort Ancient | PO | Warren Co, OH | ||
| Fort Atkinson | PO | Jefferson Co, WI | ||
| Fort Atkinson | PO | Clayton Co, IA | ||
| Fort Atkinson | PO | Nebraska Co, TX | ||
| Fort Barrington Ferry | PO | McIntosh Co, GA | ||
| Fort Blount | PO | Jackson Co, TN | ||
| Fort Browder | PO | Barbour Co, AL | ||
| Fort Buffington | PO | Benton Co, FL | ||
| Fort Buffington | PO | Cherokee Co, GA | ||
| Fort Clark | PO | Alachun Co, FL | ||
| Fort Covington | PT | Franklin Co, NY | 2,641 | water by Salmon & Little Salmon rivers |
| Fort Decatur | PO | Macon Co, AL | ||
| Fort Defiance | PO | Caldwell Co, NC | ||
| Fort Des Moines | PO | Polk Co, IA | ||
| Fort Duncan | PO | Kinney Co, TX | ||
| Fort Edward | PT | Washington Co, NY | 2,328 | water by Moosekill & Hudson rivers |
| Fort Edward Centre | PO | Fort Edward twp, Washington Co, NY | ||
| Fort Fairfield | PO | Aroostook Co, ME | ||
| Fort Fanning | PO | Levy Co, FL | ||
| Fort Gaines | PO | Early Co, GA | ||
| Fort Gibson | PV | Cherokee Nation Co, AR | water by Neosho river | |
| Fort Gratiot | V | ST Clair Co, MI | water by Lake Huron | |
| Fort Hamilton | PV | New Utrecht twp, King's Co, NY | water by Narrows, New York Harbor | |
| Fort Harley | PO | Alachum Co, FL | ||
| Fort Hembree | PO | Cherokee Co, NC | ||
| Fort Henderson | PO | Macon Co, AL | ||
| Fort Hill | PO | Lake Co, IL | ||
| Fort Hunter | PO | Florida twp, Montgomery Co, NY | ||
| Fort Jefferson | PO | Neave twp, Darke Co, OH | ||
| Fort Jennings | PO | Putnam Co, OH | ||
| Fort Jessup | PO | Sabine parish, LA | ||
| Fort Kent | PO | Aroostook Co, ME | ||
| Fort Lacey | not listed | Monroe Co, PA | ||
| Fort Leavenworth | PV | Clay Co, MO | water by Missouri & Flat rivers | |
| Fort Littleton | PO | Fulton Co, PA | ||
| Fort Madison | PO | Lee Co, IA | ||
| Fort Mill | PO | York dist, SC | ||
| Fort Miller | PV | Fort Edward twp, Washington Co, NY | water by Hudson river & Champlain canal | |
| Fort Mitchell | PO | Russell Co, AL | ||
| Fort Montgomery | PO | Cherokee Co, NC | ||
| Fort Montpelier | PO | Baldwin Co, AL | ||
| Fort Motte | PO | Orangeburgh dist, SC | ||
| Fort Osage | PO | Jackson Co, MO | ||
| Fort Pike | PO | Orleans parish, LA | ||
| Fort Plain | PV | Minden twp, Montgomery Co, NY | water by Mohawk river & Erie canal | |
| Fort Prince | PO | Spartanburgh dist, SC | ||
| Fort Recovery | PO | Mercer Co, OH | ||
| Fort Scott | PO | Bates Co, MO | ||
| Fort Seneca | PO | Seneca Co, OH | ||
| Fort Smith | PV | Crawford Co, AR | 964 | water by Arkansas & Poteau rivers |
| Fort Taylor | PO | Benton Co, FL | ||
| Fort Taylor | PO | Cherokee Co, GA | ||
| Fort Towson | V | Indian Territory Co, AR | ||
| Fort Valley | PO | Houston Co, GA | ||
| Fort Washington | PO | Prince George's Co, MD | ||
| Fort Washita | PO | Chickasaw Nation Co, AR | ||
| Fort Wayne | PV, CH | Allen Co, IN | seat of justice, water by Maumee river | |
| Fort Wilkins | PO | Houghton Co, MI | ||
| Fort Winnebago | PV | Columbia Co, WI | ||
| Fortsville | PV | Moroan twp, Saratogo Co, NY | ||
| Forty Fort | PO | Luzerne Co, PA | ||
| Forwardstown | PO | Somerset Co, PA | ||
| Foster | PT | Providence Co, RI | 1,932 | water by head branch of Pawinset river |
| Foster | PO | Brachen Co, KY | ||
| Foster Centre | PO | Providence Co, RI | ||
| Fosterdale | PO | Cohecton twp, Sullivan Co, NY | ||
| Foster's | PO | Marion Co, IL | ||
| Foster's | PO | Tuscaloosa Co, AL | ||
| Foster's Bar | PO | Yuba Co, CA | ||
| Foster's Cross Roads | PO | Bledsoe Co, TN | ||
| Foster's Fork | PO | Prince Edwards Co, VA | ||
| Foster's Mills | PO | Seneca Co, OH | ||
| Foster's Mills | PO | Johnson Co, IN | ||
| Fosteria | PO | Blair Co, PA | ||
| Fosterville | PO | Aurelius twp, Cayuga Co, NY | ||
| Fosterville | V | Henry Co, GA | ||
| Fosterville | PV | Rutherford Co, TN | ||
| Foundryville | PO | Columbia Co, PA | ||
| Fountaindale | PO | Adams Co, PA | ||
| Fountain Green | PO | Chester Co, PA | ||
| Fountain Green | PO | Hancock Co, IL | ||
| Fountain Head | PO | Sumner Co, TN | ||
| Fountain Hill | PO | Ashley Co, AR | ||
| Fountain Hill | PO | Greene Co, NC | ||
| Fountain Inn | PO | Greenville dist, SC | ||
| Fountain Mills | PO | Chester Co, PA | ||
| Fountain Run | PO | Monroe Co, KY | ||
| Fountain Spring | PO | Wood Co, VA | ||
| Fountain Springs | PO | Wapello Co, IA | ||
| Fourche A Renault | PV | Washington Co, MO | water by Mineral fork of Big river | |
| Fourche Dumas | PO | Randolph Co, AR | ||
| Fourche La Fave | T | Conway Co, AR | ||
| Fourche La Fave | T | Pope Co, AR | ||
| Four Corners | PO | Ridgefield twp, Huron Co, OH | ||
| Four Mile Branch | PO | Monroe Co, TN | ||
| Four Mile Grove | PO | Lee Co, IL | ||
| Four Mile Prairie | PO | Van Zandt Co, TX | ||
| Four Mile Prairie | PO | Fayette Co, IL | ||
| Fowler | PT | ST Lawrence Co, NY | 1,813 | water by Oswegatchie river |
| Fowler | PT | Trumbull Co, OH | 1,089 | |
| Fowler's | PO | Brooke Co, VA | ||
| Fowler's Knob | PO | Nicholas Co, VA | ||
| Fowler's Mills | PO | Geauga Co, OH | ||
| Fowlersville | PO | Livingston Co, NY | ||
| Fox | T | Clearfield Co, PA | 50 | |
| Fox | T | Carroll Co, OH | 1,452 | |
| Fox | PO | Daviess Co, IA | ||
| Foxborough | PT | Norfolk Co, MA | 1,880 | water by Rumford & Cocasset rivers |
| Fox Chase | PO | Philadelphia Co, PA | ||
| Fox Creek | PO | St Louis Co, MO | ||
| Foxcroft | PT | Piscataquis Co, ME | 1,045 | |
| Fox Lake | PO | Lake Co, IL | ||
| Fox Spring | PO | Overton Co, TN | ||
| Foxville | V | Frederick Co, MD | ||
| Foxville | PO | Fauquier Co, VA | water by Rappahanook river | |
| Fox's Store | PO | Onslow Co, NC |