1850 Atlas
| Name | What | Place | Pop | Other |
| Riley | T | Oxford Co, ME | ||
| Riley | PO | Clinton Co, MI | ||
| Riley | T | St Clair Co, MI | ||
| Riley | PO | Vigo Co, IN | ||
| Riley | T | Sandusky Co, OH | 682 | |
| Riley | T | Putnam Co, OH | 849 | |
| Riley | T | Pope Co, AR | ||
| Riley | PO | McHenry Co, IL | ||
| Riley Centre | PO | Riley twp, Sandusky Co, OH | ||
| Rileyville | PV | Wayne Co, PA | ||
| Rimersburgh | PO | Clarion Co, PA | ||
| Rindge | PT | Cheshire Co, NH | 1,274 | water by numerous ponds, tributaries of Connecticut & Merrimack rivers |
| Ringgold | PO | Cook Co, IL | ||
| Ringgold | PO | Jefferson Co, PA | ||
| Ringgold | PO | Morgan Co, OH | ||
| Ringgold | PO | Walker Co, GA | ||
| Ringgold | PO | Cherokee Co, AL | ||
| Ringgold | PO | Washington Co, MD | ||
| Ringgold | PO | Bienville parish, LA | ||
| Ringgold | PO | Platte Co, MO | ||
| Ringgold | PO | Montgomery Co, TN | ||
| Ringgold | PO | Pittsylvania Co, VA | ||
| Ringgold | PO | La Grange Co, IN | ||
| Ringoes | PV | Amwell twp, Hunterdon Co, NJ | ||
| Ringville | PO | Hampshire Co, MA | ||
| Ringwood | PO | Halifax Co, NC | ||
| Ringwood | PO | McHenry Co, IL | ||
| Rinkosa | PO | Iroquois Co, IL | ||
| Rio | PO | Cowetta Co, GA | ||
| Rio | PO | Vermilion Co, IL | ||
| Rio Frio | PO | Scott Co, VA | ||
| Rio Grande | PO | Gallia Co, OH | ||
| Rio Grande City | PO | Starr Co, TX | ||
| Ripley | PT | Somerset Co, ME | 641 | water by head waters of Sebasticook river |
| Ripley | PV, CH | Tippah Co, MS | seat of justice | |
| Ripley | PT | Montgomery Co, IN | 1,250 | |
| Ripley | PT | Rush Co, IN | 1,908 | |
| Ripley | PV | Brown Co, IL | ||
| Ripley | PT | Chautauque Co, NY | 1,732 | water by Twenty Mile creek & Lake Erie |
| Ripley | PV | Union twp, Brown Co, OH | water by Ohio river at confluence of Red Oak creek | |
| Ripley | T | Holmes Co, OH | 1,330 | |
| Ripley | T | Huron Co, OH | 1,230 | |
| Ripley | PV, CH | Lauderdale Co, TN | seat of justice, water by Cane creek | |
| Ripley's | PO | Tyler Co, VA | ||
| Ripleyville | PO | Ripley twp, Huron Co, OH | ||
| Ripton | PT | Addison Co, VT | 567 | water by Middlebury river |
| Risdon | T | Hancock Co, OH | ||
| Risdon | PO | Seneca Co, OH | ||
| Risdon | PV | St Clair Co, IL | ||
| Rising Fawn | PO | Dade Co, GA | ||
| Rising Sun | PV | Philadelphia Co, PA | ||
| Rising Sun | PO | Cecil Co, MD | ||
| Rising Sun | PO | Montgomery Co, IN | ||
| Rising Sun | PV | Ohio Co, IN | water by Ohio river | |
| Ritchie | PV, CH | Ritchie Co, VA | seat of justice | |
| Ritchieville | PV | Dinwiddie Co, VA | ||
| Rittersville | PO | Lehigh Co, PA | ||
| River | PO | Clarion Co, PA | ||
| River Head | PT, CH | Suffolk Co, Long Island, NY | 2,540 | seat of justice, water by Peconic river, Little Peconic bay & Long Island sound |
| River Hill | PO | White Co, TN | ||
| River Road Forks | PO | Mount Morris twp, Livingston Co, NY | ||
| Rivers | T | Jackson Co, MI | 518 | |
| River's Bridge | PO | Barnwell dist, SC | ||
| River Side | PO | Ulster Co, NY | ||
| River Side | PO | Cumberland Co, NC | ||
| River Styx | PO | Guilford twp, Medina Co, OH | ||
| River Town | PV | Campbell Co, GA | ||
| Rives | PV | Richland Co, OH | ||
| Rives | V, CH | Henry Co, MO | seat of justice | |
| Rivesville | PV | Marion Co, VA | ||
| Rix | PO | Ionia Co, IN | ||
| Rixeyville | PV | Culpepper Co, VA | ||
| Rix's Mills | PO | Muskingum Co, OH | ||
| Road Hall | PO | Lycoming Co, PA | ||
| Roadstown | PV | Cumberland Co, NJ | ||
| Roadville | PV | Charleston dist, SC | ||
| Roan Mountain | PO | Carter Co, TN | ||
| Roanoke | PV | Stafford twp, Genesee Co, NY | water by Allen's creek | |
| Roanoke | PV | Randolph Co, AL | ||
| Roanoke | T | Randolph Co, AR | ||
| Roanoke | PV | Randolph Co, MO | ||
| Roanoke | PO | Huntington Co, IN | ||
| Roanoke | PO | Charlotte Co, VA | ||
| Roan's Creek | PO | Carroll Co, TN | ||
| Roaring Creek | PO | Montour Co, PA | ||
| Roaring Spring | PO | Trigg Co, KY | ||
| Roark | T | Gasconade Co, MO | 1,007 | |
| Robb | PT | Posey Co, IN | ||
| Robbinston | PT | Washington Co, ME | 1,028 | water by Schoodic oe St Croix rivers |
| Roberson's Cross Roads | PO | Bledsoe Co, TN | ||
| Robert's Corners | PO | Jefferson Co, NY | ||
| Robertson's Store | PO | Pittsylvania Co, VA | ||
| Robertsonville | PO | Sullivan Co, NY | ||
| Robertsville | PV | Anderson Co, TN | ||
| Robeson | PT | Berks Co, PA | water by Schuylkill river, Alleghany & Hay creeks | |
| Robeson | PO | Brunswick Co, NC | ||
| Robina | PO | Panola Co, MS | ||
| Robin's Nest | PO | Peoria Co, IL | ||
| Robinson | T | Posey Co, IN | 1,619 | |
| Robinson Creek | PO | Pike Co, KY | ||
| Robinson | PT | Washington Co, PA | 843 | |
| Robinson | PT | Alleghany Co, PA | 1,917 | water by Ohio river, Chartier's creek & Montour's run |
| Robinson's | PV, CH | Crawford Co, IL | seat of justice | |
| Robinson's Cross Roads | PO | Benton Co, AR | ||
| Robinson's Mills | PO | Menard Co, IL | ||
| Robinson's Spring | PO | Autauga Co, AL | ||
| Robinson's Store | PO | Lincoln Co, TN | ||
| Robison's | PO | Darke Co, OH | ||
| Robisonville | PO | Bedford Co, PA | ||
| Rob Roy | PV | Fountain Co, IN | ||
| Rob Roy | PO | Jefferson Co, AR | ||
| Rocheport | PV | Boone Co, MO | water by Missouri river | |
| Rochester | PT, CH | Strafford Co, NH | 3,006 | seat of justice with Dover, water by Salmon Falls & Cocheco rivers |
| Rochester | PT | Windsor Co, VT | 1,493 | water by White river |
| Rochester | PT | Plymouth Co, MA | 3,808 | water by Buzzard's bay & Mattapoiset & Sipican rivers |
| Rochester | City | Monroe Co, NY | 36,403 | seat of justice, water by Genesee river |
| Rochester | PT | Ulster Co, NY | water by Rondout creek | |
| Rochester | PV | Salem twp, Warren Co, OH | water by Little Miami river | |
| Rochester | T | Lorain Co, OH | 896 | |
| Rochester | V | Beaver Co, PA | 993 | water by Beaver river at its confluence with the Ohio river |
| Rochester | PO | Avon twp Oakland Co, MI | water by Paint creek & Clinton river | |
| Rochester | PV | Racine Co, WI | water by Fox river | |
| Rochester | PT, CH | Fulton Co, IN | 1,401 | seat of justice, water by Tippecanoe river |
| Rochester | PV | Sangamon Co, IL | water by Sangamon river at confluence of its north & south forks | |
| Rochester | PO | Butler Co, KY | ||
| Rochester | PO | Andrew Co, MO | ||
| Rochester | PO | Jackson parish, LA | ||
| Rochester Depot | PO | Lorain Co, OH | ||
| Rochester Mills | PO | Wabash Co, IL |