1850 Atlas
| Name | What | Place | Pop | Other |
| Park | PT | St Joseph Co, MI | 805 | |
| Parker | PT | Butler Co, OH | ||
| Parkersburgh | PV | Washington twp, Morris Co, NJ | site of mineral spring | |
| Parkersburgh | PV, CH | Wood Co, VA | 1,218 | seat of justice, water by Little Kanawha river, at its confluence with the Ohio |
| Parkersburgh | PV | Montgomery Co, IN | ||
| Parkersburgh | PV | Richland Co, IL | ||
| Parker's Head | PO | Lincoln Co, ME | ||
| Parker's Settlement | PO | Posey Co, IN | ||
| Parker's Store | PO | Franklin Co, GA | ||
| Parkersville | PO | Chester Co, PA | ||
| Parkesburgh | PV | Chester Co, PA | ||
| Parkeville | PO | St Tammany parish, LA | ||
| Parkeville | PO | Noxubee Co, MS | ||
| Parkhead | PO | Washington Co, MD | ||
| Parkison | PO | Beaver Co, PA | ||
| Park Hall | PO | St Mary's Co, MD | ||
| Parkman | PT | Piscataquis Co, ME | 1,243 | water by tributary of Piscataquis river |
| Parkman | PT | Geauga Co, OH | 1,383 | water by head waters of Grand river, & tributary of Cuyahoga river |
| Parks | PO | Edgefield dist, SC | ||
| Parks' | PO | Scott Co, AR | ||
| Parks' Bar | PO | Yuba Co, CA | ||
| Parks' Corners | PO | Boone Co, IL | ||
| Parks' Mills | PO | Franklin Co, OH | ||
| Parks' Store | PO | Cabarras Co, NC | ||
| Parks' Store | PO | Jackson Co, AL | ||
| Parksville | PV | Sullivan Co, NY | ||
| Parksville | PV | Platte Co, MO | 309 | |
| Parma | PT | Monroe Co, NY | 2,946 | water by Salmon & Little Salmon creeks, Lake Ontario |
| Parma | PT | Cuyahoga Co, OH | 1,329 | water by tributary of Cuyahoga river |
| Parma | T | Jackson Co, MI | 1,081 | |
| Parma | PO | Shelby Co, IN | ||
| Parma Centre | PO | Parma twp, Monroe Co, NY | ||
| Parnassus | PO | Augusta Co, VA | ||
| Parnassus | PO | Wilcox Co, AL | ||
| Parrish | PO | Des Moines Co, IA | ||
| Parrizade | PO | Wayne Co, VA | ||
| Parrottsville | PV | Cocke Co, TN | ||
| Parrysville | PV | Carbon Co, PA | ||
| Parsippany | PV | Hanover twp, Morris Co, NJ | water by Parsippany river | |
| Parsonage | PO | Williamsburg dist, SC | ||
| Parsonsfield | PT | York Co, ME | 2,322 | water by Ossipee river |
| Parson's Mills | PO | Guilford Co, NC | ||
| Partlow's | PO | Spottsylvania Co, VA | ||
| Partnership | PO | Charles Co, MD | ||
| Partridge Island | PO | Hancock twp, Delaware Co, NY | ||
| Pascagoula | PO | Jackson Co, MS | water by Pascagoula river & bay | |
| Pasco | PO | Dallas Co, MO | ||
| Pascoag | PO | Providence, RI | ||
| Pashawn | PO | La Grange Co, IN | ||
| Paskack | PV | Washington twp, Passaic Co, NJ | water by Hackensack river | |
| Passadumeag | PT | Penobscot Co, ME | 295 | water by Penobscot & Passadumkeag rivers |
| Pass Christian | PV | Harrison Co, MS | water by Bay of St Louis | |
| Passumpsic | PV | Caledonia Co, VT | ||
| Passyunk | T | Philadelphia Co, PA | 1,607 | water by Delaware & Schuylkill rivers |
| Patchin | PO | Erie Co, NY | ||
| Patchin's Mills | PO | Conhocton twp, Steuben Co, MY | ||
| Patchogue | PV | Brookhaven twp, Suffolk Co, NY | water by Great South Bay | |
| Paterson | City | Passaic Co, NJ | 11,138 | seat of justice |
| Patmos | PO | Mahoning Co, OH | ||
| Patoka | PT | Gibson Co, IN | 2,579 | |
| Paton | PO | Cape Girardeau Co, MO | ||
| Patrick | PV, CH | Patrick Co, VA | seat of justice | |
| Patricktown | PT | Lincoln Co, ME | 552 | water by head waters of Sheepscot & Damariscotta rivers |
| Patriot | PV | Switzerland Co, IN | water by Ohio river | |
| Patriot | PV | Perry twp, Gallia Co, OH | ||
| Patten | T | Penobscot Co, ME | 470 | |
| Patten | PT | Centre Co, PA | 2,206 | |
| Patten's Home | PO | Rutherford Co, NC | ||
| Patten's Mills | PO | Fort Ann twp, Washington Co, NY | ||
| Patterson | PO | Putnam Co, NY | water by Croton river | |
| Patterson | PO | Thompson twp, Delaware Co, OH | ||
| Patterson | V | Wayne Co, MO | ||
| Patterson's Depot | PO | Hampshire Co, VA | ||
| Patterson's Mills | PO | Washington Co, PA | ||
| Patterson's Store | PO | Allemance Co, NC | ||
| Pattersonville | PO | St Mary's parish, LA | ||
| Pattillos | PO | Jefferson Co, TX | ||
| Pattonsburgh | PV | Botetourt Co, VA | water by James river | |
| Pattonsburgh | PO | Daviess Co, MO | ||
| Pattonsville | PO | Scott Co, VA | ||
| Pattonville | PO | Bedford Co, PA | ||
| Patuxent | PO | Anne Arundel Co, MD | ||
| Paulding | PO | Paulding Co, OH | ||
| Paulding | PV, CH | Jasper Co, MS | seat of justice, water by head waters of Leaf river | |
| Paulina | PO | Warren Co, NJ | ||
| Paulina | V | Hancock twp, Delaware Co, NY | ||
| Pavilion | not listed | Kendall Co, IL | ||
| Pavilion | PT | Genesee Co, NY | 1,640 | water by Allen's creek |
| Pavilion | PT | Kalamazoo Co, MI | 495 | water by the Sandy lakes & tributaries of St Joseph's river |
| Pavilion Centre | PO | Pavilion twp, Genesee Co, NY | ||
| Pawlet | PT | Rutland Co, VT | 1,843 | water by Pawlet river & Indian stream |
| Pawlings | PT | Dutchess Co, NY | 1,720 | water by Croton river |
| Pawlingsville | PO | Pawlings twp, Dutchess Co, NY | ||
| Paw Paw | PV, CH | Van Buren Co, MI | seat of justice, water by head waters of Papaw river | |
| Paw Paw | PO | Miami Co, IN | ||
| Paw Paw | PO | Morgan Co, VA | ||
| Paw Paw Grove | has see Papaw Grove | |||
| Pawtucket | PV | part in Pawtucket twp, (no Co given) MA & North Providence twp, Providence Co, RI | water by Pawtucket river at the head of navigation | |
| Pawtucket | PT | Bristol Co, MA | 2,987 | water by Pawtucket river |
| Pawtuxet | PV | Warwick & Cranston twp, Kent Co, RI | water by Pawtuxet river | |
| Pawtuxet | PO | Wakulla Co, FL | ||
| Paxinos | PO | Northumberland Co, PA | ||
| Paxton | PT | Worcester Co, MA | ||
| Paxton | T | Ross Co, OH | 930 | |
| Pay Down | PO | Osage Co, MO | ||
| Paynesville | PV | Pike Co, MO | ||
| Paynesville | PV | Sumter Co, AL | water by Sucarnockie creek | |
| Payntersville | PO | Jackson Co, IN | ||
| Payson | PV | Adams Co, IL |