1850 Atlas
| Name | What | Place | Pop | Other |
| Rock | PO | Plymouth Co, MA | ||
| Rock | PO | Lancaster Co, PA | ||
| Rock Bottom | PO | Middlesex Co, MA | ||
| Rock Camp | PO | Braxton Co, VA | ||
| Rock Castle | PV | Patrick Co, VA | ||
| Rock City | PO | Milan twp, Dutchess Co, NY | ||
| Rock City Mills | PO | Saratoga Co, NY | ||
| Rock Creek | PO | Orange Co, NC | ||
| Rock Creek | PO | Lewis Co, KY | ||
| Rock Creek | PO | Cedar Co, IA | ||
| Rock Creek | PO | Bartholomew Co, IN | 820 | |
| Rock Creek | PO | Carroll Co, IL | ||
| Rock Creek | PO | Somerset Co, MD | ||
| Rock Creek | PO | Franklin Co, AL | ||
| Rock Creek | PO | Yell Co, AR | ||
| Rock Grove | PO | Stephenson Co, IL | ||
| Rock Hall | PV | Kent Co, MD | ||
| Rock Haven | PO | Mead Co, KY | ||
| Rock Hill | T | Bucks Co, PA | 2,448 | water by tributaries of Tohickon & Perkiomen creeks |
| Rock Hill | PO | St Louis Co, MO | ||
| Rock Hill | PO | Marquette Co, WI | ||
| Rock House | PO | Sumner Co, TN | ||
| Rock House | PO | Hocking Co, OH | ||
| Rock Island | PO | Warren Co, TN | ||
| Rock Island | PO | Austin Co, TX | ||
| Rock Island | PV, CH | Rock Island Co, IL | seat of justice | |
| Rock Mills | PO | Rappahannock Co, VA | ||
| Rock Mills | PO | Anderson dist, SC | ||
| Rock Mills | PO | Hancock Co, GA | ||
| Rock Mills | PO | Randolph Co, AL | ||
| Rock Point | PO | Independence Co, AR | ||
| Rock Prairie | PO | Rock Co, WI | ||
| Rock Prairie | PO | Dade Co, MO | ||
| Rock Quarry | PO | Pope Co, IL | ||
| Rock Rift | PO | Delaware Co, NY | ||
| Rock River | PO | Fond du Lace Co, WI | ||
| Rock Run | PO | Stephenson Co, IL | ||
| Rock Run | PO | Harford Co, MD | ||
| Rock Spring | PO | Walker Co, GA | ||
| Rock Spring | PO | Orange Co, NC | ||
| Rock Springs | PO | Cecil Co, MD | ||
| Rock Stream | PO | Starkey twp, Yates Co, NY | ||
| Rock Valley | PO | Marshall Co, VA | ||
| Rock Valley | PO | Hampden Co, MA | ||
| Rockaway | PV | Hempstead twp, Queens Co, Long Island, NY | water by Rockaway bay | |
| Rockaway | PV | Morris Co, NJ | 3,139 | water by Rockaway river |
| Rockbridge | PV | Gwinnett Co, GA | ||
| Rockbridge | PO | Greene Co, IL | ||
| Rockbridge | PV, CH | Ozark Co, MO | seat of justice | |
| Rockdale | PT | Crawford Co, PA | 1,086 | |
| Rockdale | PO | Chenango Co, NY | ||
| Rockdale | PO | Randolph Co, AL | ||
| Rockford | PV, CH | Surry Co, NC | seat of justice, water by Yadkin river | |
| Rockford | PV, CH | Coosa Co, AL | seat of justice | |
| Rockford | T | Caldwell Co, MO | ||
| Rockford | PV | Jackson Co, IN | ||
| Rockford | PT, CH | Winnebago Co, IL | 2,093 | seat of justice, situated on Rock river rapids |
| Rockholds | PO | Sullivan Co, TN | ||
| Rockhouse Prairie | PO | Buchanan Co, MO | ||
| Rockingham | PT | Windham Co, VT | 2,837 | water by Connecticut, William's and Saxton's river |
| Rockingham | PV, CH | Richmond Co, NC | seat of justice, water by Hitchcock's creek | |
| Rockland | PT | Sullivan Co, NY | 1,175 | water by Big Beaver kill |
| Rockland | PT | Venango Co, PA | 1,409 | |
| Rockland | T | Bucks Co, PA | 1,734 | water by Maxtawny & Sacony creeks |
| Rockland | PV | East Thomaston twp, Lincoln Co, ME | ||
| Rockland Lake | PO | Clarkstown twp, Rockland Co, NY | situated near Rockland Lake | |
| Rockland Mills | PO | Augusta Co, VA | ||
| Rockport | PT | Essex Co, MA | 3,274 | water by Atlantic ocean |
| Rockport | PO | Carbon Co, PA | ||
| Rockport | PT | Cuyahoga Co, OH | 1,441 | water by Lake Erie & Rocky river |
| Rockport | PV, CH | Spender Co, IN | seat of justice, water by Ohio river | |
| Rockport | PO | Hot Springs Co, AR | water by Wachita river | |
| Rockport | PO | Pike Co, IL | ||
| Rocksburgh | PO | Warren Co, NJ | ||
| Rocksford | PO | Tuscarawas Co, OH | ||
| Rockton | PO | Winnebago Co, IL | ||
| Rockton | PO | Herkimer Co, NY | ||
| Rockville | PV | Norfolk Co, MA | ||
| Rockville | PO | Belfast twp, Alleghany Co, NY | ||
| Rockville | PV | Chester Co, PA | ||
| Rockville | PV, CH | Montgomery Co, MD | seat of justice, water by head waters of Watt's branch of Potomac river | |
| Rockville | PV | Adams Co, OH | ||
| Rockville | PV | Rowan Co, NC | ||
| Rockville | PV | Putnam Co, GA | ||
| Rockville | PV, CH | Parke Co, IN | seat of justice | |
| Rockville | PV | Will Co, IL | 514 | |
| Rockville | PV | Monroe Co, TN | ||
| Rockville | PO | Tolland Co, CT | ||
| Rockville | PO | Washington Co, RI | ||
| Rockville | PO | Delaware Co, IA | ||
| Rockville | PO | Hanover Co, VA | ||
| Rockville | PO | Lexington dist, SC | ||
| Rockville Centre | PO | Queens Co, Long Island, NY | ||
| Rockwell | PO | Pickens dist, SC | ||
| Rockwell | PO | Bond Co, IL | ||
| Rocky Bayou | PO | Izard Co, AR | ||
| Rocky Branch | PO | Greenup Co, KY | ||
| Rocky Comfort | PO | Sevier Co, AR | ||
| Rocky Creek | PO | Iredell Co, NC | ||
| Rocky Ford | PO | Pontotoc Co, MS | ||
| Rocky Fork | PT | Boone Co, MO | ||
| Rocky Gap | PO | Tazewell Co, VA | ||
| Rocky Hill | PT | Hartford Co, CT | water by Connecticut river | |
| Rocky Hill | PV | Montgomery twp, Somerset Co, NJ | water by Millstone river | |
| Rocky Hill | PO | Jackson Co, OH | ||
| Rocky Hill | PO | Barren Co, KY | ||
| Rocky Hill | PO | Fayette Co, VA | ||
| Rocky Mills | PO | La Vaca Co, TX | ||
| Rocky Mount | PV, CH | Franklin Co, VA | seat of justice, water by tributary of Roanoke river | |
| Rocky Mount | PV | Edgecombe Co, NC | ||
| Rocky Mount | PV | Meriwether Co, GA | ||
| Rocky Mount | PO | Miller Co, MO | ||
| Rocky Mount | PO | Kemper Co, MS | ||
| Rocky Mount | PO | Fairfield dist, SC | ||
| Rocky Narrows | PO | Monroe Co, OH | ||
| Rocky Palins | PO | Newton Co, GA | ||
| Rocky Point | PO | Scott Co, VA | ||
| Rocky Point | PO | Attala Co, MS | ||
| Rocky Ridge | PO | Anderson dist, SC | ||
| Rocky River | PO | Warren Co, TN | ||
| Rocky Run | PO | Hancock Co, IL | ||
| Rocky Run | PO | Columbia Co, WI | ||
| Rocky Spring | PO | Jackson Co, AL | ||
| Rocky Spring | PO | Grainger Co, TN | ||
| Rocky Spring | PV | Claiborne Co, MS | ||
| Rocky Well | PO | Lexington dist, SC |