1850 Atlas
| Name | What | Place | Pop | Other |
| Monsey | PO | Rockland Co, NY | ||
| Monson | PT | Piscataquis Co, ME | 654 | water by Piscataquis river & Sebec pond |
| Monson | PT | Hampden Co, MA | 2,831 | water by Chickopee river |
| Montacute | PO | Polk Co, IA | ||
| Montague | PT | Franklin Co, MA | 1,518 | water by Connecticut & Sawmill rivers |
| Montague | PT | Sussex Co, NJ | 1,009 | water by Delaware river |
| Montague | PV | Essex Co, VA | ||
| Montague Canal | PV | Montague twp, Franklin Co, MA | water by Connecticut river | |
| Mont Alto | PV | Franklin Co, PA | ||
| Montauk | PO | Crawford Co, MO | ||
| Montcalm | PO | Montcalm Co, MI | seat of justice (not listed as such) | |
| Montebello | PO | Hancock Co, IL | ||
| Monteithville | PO | Stafford Co, VA | ||
| Montello | PO | Marquette Co, WI | ||
| Monterey | PV, CH | Monterey Co, CA | seat of justice | |
| Monterey | PO | Berkshire Co, MA | ||
| Monterey | PO | Dutchess Co, NY | ||
| Monterey | PO | Berks Co, PA | ||
| Monterey | PO | Clermont Co, OH | ||
| Monterey | PO | Highland Co, VA | ||
| Monterey | PO | Abbeville dist, SC | ||
| Monterey | PO | McNairy Co, TN | ||
| Monterey | PO | Butler Co, AL | ||
| Monterey | PO | Owen Co, KY | ||
| Monterey | PO | Calhoun Co, IL | ||
| Monterey | PO | Davis Co, IA | ||
| Monterey | PO | Waukesha Co, WI | ||
| Monterey | PO | Rankin Co, MS | ||
| Monterey | PO | Red River Co, TX | ||
| Monterey | PO | Pulaski Co, IN | ||
| Monterey Landing | PO | Concordia parish, LA | ||
| Montevallo | PV | Shelby Co, AL | ||
| Montevideo | PO | Elbert Co, GA | ||
| Montezuma | PV | Mentz twp, Cayuga Co, NY | at the junction of Cayuga & Seneca canal with Erie canal, water by Seneca river & Cayuga lake outlet | |
| Montezuma | PO | Pike Co, IL | water by Illinois river | |
| Montezuma | PV | Parke Co, IN | water by Wabash river | |
| Montezuma | PO | Mercer Co, OH | ||
| Montezuma | PO | Union Co, KY | ||
| Montezuma | PV | McNairy Co, TN | ||
| Montezuma | PO | Green Co, WI | ||
| Montezuma | PO | Poweshiek Co, IA | ||
| Montfort | PO | Grant Co, WI | ||
| Montgomery | PT | Franklin Co, VT | 1,001 | water by Trout river |
| Montgomery | PT | Hampden Co, MA | 393 | water by Westfield river |
| Montgomery | PT | Orange Co, NY | 3,933 | water by Wall kill |
| Montgomery | T | Somerset Co, NJ | 1,763 | water by Beden's & Stony brooks |
| Montgomery | T | Franklin Co, PA | 3,235 | water by Conecocheague creek |
| Montgomery | T | Montgomery Co, PA | 971 | water by Wisahickson creek & west branch of Neshaminy creek |
| Montgomery | T | Indiana Co, PA | 751 | |
| Montgomery | PV | Sycamore two, Hamilton Co, OH | ||
| Montgomery | T | Franklin Co, OH | 1,331 | |
| Montgomery | T | Marion Co, OH | 643 | |
| Montgomery | PT | Richland Co, OH | 986 | |
| Montgomery | T | Wood Co, OH | 922 | |
| Montgomery | T | Monroe Co, AR | 317 | |
| Montgomery | T | Benton Co, MO | ||
| Montgomery | PO | Sumner Co, TN | ||
| Montgomery | City | Montgomery Co, AL | 11,937 | seat of justice, Capital of Alabama |
| Montgomery | PO | Montgomery Co, TX | ||
| Montgomery | PO | Jennings Co, IN | ||
| Montgomery | PT | Owen Co, IN | ||
| Montgomery Centre | PO | Montgomery twp, Franklin Co, VT | ||
| Montgomery Cross Roads | PO | Montgomery twp, Wood Co, OH | ||
| Montgomery's Ferry | PO | Perry Co, PA | on Susquehanna river | |
| Montgomeryville | PV | Montgomery Co, PA | 971 | |
| Monthalia | PO | Panola Co, MS | ||
| Monticello | PT | Aroosrook Co, ME | 227 | |
| Monticello | PV, CH | Thompson twp, Sullivan Co, NY | seat of justice | |
| Monticello | PV | Fairfield dist, SC | ||
| Monticello | PV, CH | Jasper Co, GA | seat of justice | |
| Monticello | PV, CH | Jefferson Co, FL | 329 | seat of justice |
| Monticello | PV | Pike Co, AL | water by tributary of Pea river | |
| Monticello | PV, CH | Lawrence Co, MS | seat of justice, water by Pearl river | |
| Monticello | PV, CH | Wayne Co, KY | seat of justice, water by Beaver creek | |
| Monticello | PV, CH | White Co, IN | seat of justice, water by Tippecanoe river | |
| Monticello | PV, CH | Piatte Co, IL | seat of justice, water by Sangamon river | |
| Monticello | PV, CH | Lewis Co, MO | seat of justice, water by North Fabias river | |
| Monticello | PO | Drew Co, AR | ||
| Monticello | PO | Jones Co, IA | ||
| Monticello | PO | Guilford Co, NC | ||
| Monticello | PO | Green Co, WI | ||
| Monticello | PO | Carroll parish, LA | ||
| Montour | T | Columbia Co, PA | 409 | |
| Montours | PO | Alleghany Co, PA | ||
| Montpelier | PT | Washington Co, VT | 3,210 | seat of justice, Capital of VT, water by Onion river |
| Montpelier | PO | Hanover Co, VA | ||
| Montpelier | PV | Richmond Co, NC | ||
| Montpelier | PV | Marengo Co, AL | ||
| Montpelier | PV | Blackford Co, IN | water by Salamanic river | |
| Montpelier | PO | Adair Co, KY | ||
| Mont Petrea | PO | De Witt Co, TX | ||
| Montra | PO | Shelby Co, OH | ||
| Montrose | PB, CH | Bridgewater twp, Susquehanna Co, PA | 917 | seat of justice |
| Montrose | PT | Lee Co, IA | 1,722 | |
| Montrose | PO | Jasper Co, MS | ||
| Montrose | PO | Smith Co, TN | ||
| Montorse | PO | Summit Co, OH | ||
| Monturesville | PV | Lycoming Co, PA | 228 | |
| Montville | PT | Waldo Co, ME | 1,881 | water by tributaries of Sheepscot river |
| Montville | T | New London Co, CT | 1,848 | water by Thames & Yantic rivers |
| Montville | PV | Pequannock twp, Morris Co, NJ | on the Morris canal | |
| Montville | PT | Geauga Co, OH | 702 | |
| Montville | T | Medina Co, OH | 1,077 | |
| Monument | PV | Sandwich twp, Barnstable Co, MA | water by Buzzard's bay | |
| Monument Island | PO | Delaware Co, NY |