1850 Atlas
| Name | What | Place | Pop | Other |
| Niagara | PT | Niagara Co, NY | 1,951 | on Niagara river & falls |
| Niagara Falls | PV | Niagara twp, Niagara Co, NY | water by Niagara river at Niagara Falls | |
| Niangua | T | Benton Co, MO | ||
| Niccottoo | PO | Arkansas Co, AR | ||
| Nicholas | PT, CH | Nicholas Co, VA | seat of justice | |
| Nicholasville | PV, CH | Jessamine Co, KY | seat of justice, water by Kentucky river | |
| Nichols | PT | Tioga Co, NY | 1,905 | water by Susquehanna river |
| Nicholson | PT | Wyoming Co, PA | 727 | |
| Nicholson's Store | PO | Choctaw Co, AL | ||
| Nicholsonville | PO | Putnam Co, IN | ||
| Nicholsville | PV | Hopkinton twp, St Lawrence Co, NY | water by east branch of St Regis river | |
| Nickelsville | PO | Scott Co, VA | ||
| Nickel's Mills | PO | Monroe Co, VA | ||
| Nicolans | PO | Sutter Co, CA | ||
| Niconza | PO | Miami Co, IN | ||
| Night's Prairie | PO | Hamilton Co, IL | ||
| Nile | PO | Alleghany Co, NY | ||
| Niles | PT | Cayuga Co, NY | 2,053 | water by Owasco & Skeneateles lakes |
| Niles | PT | Berrien Co, MI | water by St Joseph's river | |
| Niles | PO | Cook Co, IL | ||
| Niles | PO | Appanoose Co, IA | ||
| Niles | PO | Trumbull Co, OH | ||
| Nimishillen | T | Stark Co, OH | 2,587 | water by Nimishillen creek |
| Nimisilla | PV | Franklin twp, Summit Co, OH | ||
| Nimmon's Cross Roads | PO | Delaware Co, OH | ||
| Nine Corners | PO | Cayuga Co, NY | ||
| None Eagles | PO | Decatur Co, IA | ||
| Nine Mile | PO | Bledsoe Co, TN | ||
| Nine Mile Prairie | PT | Callaway Co, MO | ||
| Nine Mile Prairie | PO | Perry Co, IL | ||
| Nine Points | PO | Lancaster Co, PA | ||
| Ninevah | PV | Colesville twp, Broome Co, NY | water by Susquehanna river | |
| Nineveh | PO | Warren Co, VA | ||
| Nineveh | PT | Bartholomew Co, IN | 720 | |
| Nineveh | PO | Johnson Co, IN | ||
| Nippenose | PT | Lycoming Co, PA | 351 | water by Nippenose creek & north branch of Susquehanna river |
| Niskayuna | PT | Schenectady Co, NY | 783 | water by Mohawk river |
| Nittany | PO | Centre Co, PA | ||
| Niverville | PO | Columbia Co, NY | ||
| Nixburgh | PV | Coosa Co, AL | ||
| Noah | PO | Shelby Co, IN | ||
| Noank | PO | New London Co, CT | ||
| Noble | PV, CH | Noble Co, IN | 595 | seat of justice, water by Elkhart river |
| Noble | T | Cass Co, IN | 743 | |
| Noble | T | Wabash Co, IN | 3,489 | |
| Noble | T | Noble Co, OH | 1,702 | |
| Noble | T | Defiance Co, OH | 389 | |
| Noble Centre | PO | Branch Co, MI | ||
| Noble Iron Works | PO | Noble Co, IN | ||
| Noblesburgh | PT | Lincoln Co, ME | 1,408 | water by Damariscotta pond & river |
| Nobletown | PV | Fayette twp, Allegheny Co, PA | water by a tributary of Chartier's creek | |
| Noblesville | PV, CH | Hamilton Co, IN | 1,643 | seat of justice, water by west fork of White river |
| Nobleville | PO | Noble Co, OH | ||
| Nochway | PO | Randolph Co, GA | ||
| Nockamixon | T | Bucks Co, PA | 2,445 | water by Delaware river & Gallows run |
| Nodaway | PO | Page Co, IA | ||
| Nodaway | PT | Andrews Co, MO | 2,667 | |
| Noland's Ferry | PO | Loudoun Co, VA | water by Monocacy river | |
| Nolansville | PO | Bell Co, TX | ||
| Nolensville | PV | Williamson Co, TN | ||
| Nolin | PO | Hardin Co, KY | ||
| Noming Grove | PO | Westmoreland Co, VA | ||
| Nonconner | PO | Fayette Co, TN | ||
| Nonpariel | PO | Knox Co, OH | ||
| Norfolk | PT | Litchfield Co, CT | 1,643 | water by Blackberry river |
| Norfolk | PT | St Lawrence Co, NY | 1,753 | water by Racket river |
| Norfolk | City | Norfolk Co, VA | 14,326 | seat of justice, on Elizabeth river |
| Norfolk | PO | Mississippi Co, MO | ||
| Norridgewock | PT, CH | Somerset Co, ME | 1,848 | seat of justice, water by Kennebec river |
| Norris Creek | PO | Lincoln Co, TN | ||
| Norristown | PB, CH | Montgomery Co, PA | 6,024 | seat of justice, water by Schuylkill river |
| Norristown | PV | Carroll Co, OH | ||
| Norristown | PV, CH | Pope Co, AR | seat of justice | |
| Norriton | T | Montgomery Co, PA | 1,594 | water by Schuylkill river |
| Norritonville | PV | Montgomery Co, PA |