1850 Atlas
| Name | What | Place | Pop | Other |
| Moodus | PO | East Haddam twp, Middlesex Co, CT | ||
| Moody's Mill | PO | Morgan Co, OH | ||
| Mooers | PT | Clinton Co, NY | 3,365 | water by Chazy river |
| Moon | T | Beaver Co, PA | 916 | |
| Moon | PT | Alleghany Co, PA | 1,383 | water by Ohio river |
| Moon's | PO | Fayette Co, OH | ||
| Moon's Prairie | PO | Jefferson Co, IL | ||
| Moon's Rancho | PO | Colusi Co, CA | ||
| Mooney | T | Polk Co, MO | ||
| Mooney | PT | Phillips Co, AR | 335 | |
| Mooney | PO | Jackson Co, IN | ||
| Moore | T | Northampton Co, PA | 2,615 | |
| Moore's | PO | Bowie Co, TX | ||
| Moore's Creek | PO | New Hanover Co, NC | ||
| Moore's Cross Roads | PO | Hardeman Co, TN | ||
| Moore's Forks | PO | Clinton Co, NY | ||
| Moore's Hill | PO | Dearborn Co, IN | ||
| Moore's Mills | PO | Jackson Co, VA | ||
| Moore's Ordinary | PO | Prince Edward Co, VA | ||
| Moore's Prairie | PO | Jefferson Co, IL | ||
| Moore's Salt Works | PO | Ross twp, Jefferson Co, OH | ||
| Moore's Store | PO | Shenandoah Co, VA | ||
| Moore's Vinyard | PO | Bartholomew Co, IN | ||
| Moorefield | PV, CH | Hardy Co, VA | seat of justice, water by Potomac river | |
| Moorefield | PV | Nicholas Co, KY | water by branch of Licking river | |
| Moorefield | PT | Harrison Co, OH | 1,265 | |
| Moorefield | PV | Switzerland Co, IN | ||
| Mooresborough | PV | Cleveland Co, NC | water by Sandy run | |
| Mooresborough | PV | Liberty twp, Montour Co, PA | ||
| Mooresborough | PO | Pulaski Co, IN | ||
| Mooresborough | PO | Hawkins Co, TN | ||
| Moorestown | PV | Chester twp, Burlington Co, NJ | water by north branch of Pensauken creek | |
| Mooresville | PV | Orange Co, NC | ||
| Mooresville | PV | Limestone Co, AL | ||
| Mooresville | PV | Marshall Co, TN | ||
| Mooresville | PV | Morgan Co, IN | water by White Lick creek | |
| Mooreheadville | not listed | Erie Co, PA | ||
| Moorland | PO | Morefield twp, Wayne Co, OH | ||
| Moorville | PO | Itawamba Co, MS | ||
| Moose Meadow | PO | Tolland Co, CT | ||
| Moose River | PO | Somerset Co, ME | ||
| Moosop | PO | Windham Co, CT | ||
| Moral | T | Shelby Co, IN | 1,192 | |
| Moral's De La Vaca | PO | Jackson Co, TX | ||
| Moravia | PT | Cayuga Co, NY | 1,876 | water by Owasco lake & inlet |
| Moravia | PO | Appanoose Co, IA | ||
| Mordanville | PV | Columbia Co, PA | ||
| Moreau | PT | Saratoga Co, NY | 1,834 | water by Hudson river |
| Moreau | T | Morgan Co, MO | ||
| Moreau | PT | Coles Co, MO | ||
| Moreau Station | PO | Saratoga Co, NY | ||
| Morefield | T | Clark Co, OH | 1,124 | |
| Morefield | T | Harrison Co, OH | 1,265 | |
| Morehouse | T | Hamilton Co, NY | ||
| Morehouseville | PV, CH | Hamilton Co, NY | seat of justice, water by Canada creek | |
| Moreland | PO | Dix twp, Chemung Co, NY | ||
| Moreland | T | Montgomery Co, PA | 2,348 | water by Pennypack creek |
| Moreland | PT | Lycoming Co, PA | water by Little Muncy creek | |
| Moreland | T | Philadelphia Co, PA | 714 | |
| Moreland | PO | Bourbon Co, KY | ||
| Moreland | T | Scott Co, MO | ||
| Moreland | PO | Fauquier Co, VA | ||
| Moreman's River | PO | Albemarle Co, VA | ||
| Morenci | PO | Lenawee Co, MI | ||
| Moresville | PV | Roxbury twp, Delaware Co, NY | ||
| Moretown | PT | Washington Co, VT | 1,335 | water by Mad & Winooski rivers |
| Moretz Mill | PO | Ashe Co, NC | ||
| Morgan | PT | Orleans Co, VT | 486 | water by a tributary of Clyde river & Seymour's lake |
| Morgan | T | Greene Co, PA | 1,157 | |
| Morgan | PT | Ashtabula Co, OH | 888 | water by Grand river |
| Morgan | T | Butler Co, OH | 1,706 | |
| Morgan | T | Gallia Co, OH | 1,128 | |
| Morgan | PT | Harrison Co, OH | ||
| Morgan | T | Knox Co, OH | 823 | |
| Morgan | PT | Morgan Co, OH | 2,308 | |
| Morgan | T | Scioto Co, OH | 280 | water by Scioto river |
| Morgan | T | Owen Co, IN | 951 | |
| Morgan | T | Livingston Co, MO | ||
| Morgan | PT | Polk Co, MO | ||
| Morgan | PV, CH | Morgan Co, TN | seat of justice, water by Emery's river | |
| Morganfield | PV, CH | Union Co, KY | seat of justice | |
| Morgansburgh | PV | Fauquier Co, VA | ||
| Morgan's Creek | PO | Benton Co, TN | ||
| Morgan's Creek | PO | Orange Co, NC | ||
| Morgan's Fork | PO | Pike Co, OH | ||
| Morgan's Mills | PO | Union Co, NC | ||
| Morgan's Ridge | PO | Marion Co, VA | ||
| Morgansville | PO | Morgan Co, OH | ||
| Morgansville | PO | Genesee Co, NY | ||
| Morgantown | PV | Morgan Co, IN | water by Big Indian creek | |
| Morgantown | PV, CH | Monongalia Co, VA | seat of justice, water by Monongahela river at head of steam navigation | |
| Morgantown | PV | Caernarvon twp, Berks Co, PA | ||
| Morgantown | PV, CH | Burke Co, NC | seat of justice, water by Catawba river | |
| Morgantown | PV | Blount Co, TN | ||
| Morgantown | PV, CH | Butler Co, KY | seat of justice, water by Green river | |
| Morganville | PO | Nottoway Co, VA | ||
| Morganville | PO | Hillsdale Co, MI | ||
| Moriah | PT | Essex Co, NY | 3,065 | water by Lake Champlain & Schroon branch of Hudson river |
| Moriches | PV | Brookhaven twp, Suffolk Co, Long Island, NY | ||
| Moringville | PV | Chatham Co, NC | ||
| Moringville | PO | Westchester Co, NY | ||
| Morley | PO | Canton twp, St Lawrence Co, NY | ||
| Mormon Hill | PO | Marshall Co, IA | ||
| Mormon Island | PO | Sacramento Co, CA | ||
| Morning Sun | PV | Israel twp, Preble Co, OH | ||
| Morning Sun | PO | Shelby Co, TN | ||
| Morning Sun | PO | Louisa Co, IA | ||
| Moro | PO | Dallas Co, AR |