1850 Atlas
| Name | What | Place | Pop | Other |
| Louina | PO | Randolph Co, AL | ||
| Louisa | PO | Stephenson Co, IL | ||
| Louisa | PV, CH | Lawrence Co, KY | seat of justice, water by Big Sandy river | |
| Louisa | PV, CH | Louisa Co, VA | seat of justice | |
| Louisburgh | PV, CH | Franklin Co, NC | seat of justice, water by Tar river | |
| Louisiana | PV | Pike Co, MO | water by Mississippi river | |
| Louisville | PT | St Lawrence Co, NY | 2,054 | water by Grass & ST Lawrence reivers |
| Louisville | PV, CH | Jefferson Co, GA | seat of justice, water by Rocky Comfort creek | |
| Louisville | PV | Barbour Co, AL | ||
| Louisville | PV, CH | Winston Co, MS | seat of justice, water by head waters of Pearl river | |
| Louisville | PV | Blount Co, TN | water by Tennessee river | |
| Louisville | City | Jefferson Co, KY | 43,194 | seat of justice, on Ohio river |
| Louisville | PV | Stark Co, OH | ||
| Louisville | PV | Clay Co, IL | ||
| Louisville | PV | Lincoln Co, MO | ||
| Louisville | PO | El Dorado Co, CA | ||
| Louisville Landing | PO | St Lawrence Co, NY | ||
| Lounde's Ferry | PO | Williamsburgh dist, SC | ||
| Loutre | T | Audrain Co, MO | ||
| Loutre Island | PO | Montgomery Co, MO | ||
| Lovelace | PO | Wilkes Co, NC | ||
| Lovelaceville | PO | Ballard Co, KY | ||
| Lovelady | PO | Caldwell Co, NC | ||
| Loveland | PO | Clinton Co, PA | ||
| Loveland | PO | Clermont Co, OH | ||
| Lovelia | PO | Monroe Co, IA | ||
| Lovell | PT | Oxford Co, ME | 1,193 | |
| Lovely Mount | PO | Montgomery Co, VA | ||
| Love's Mills | PO | Washington Co, VA | ||
| Lovett's | PO | Adams Co, OH | ||
| Lovettsville | PV | Loudoun Co, VA | ||
| Loveville | PV | Newcastle Co, DE | ||
| Lovingston | PV, CH | Nelson Co, VA | seat of justice | |
| Lovington | PO | Moultrie Co, IL | ||
| Low Hampton | PO | Hamton twp, Washington Co, NY | ||
| Low Point | PO | Woodford Co, IL | ||
| Lowell | PT | Penobscot Co, ME | 378 | |
| Lowell | PT | Orleans Co, VT | 637 | water by Missisque river |
| Lowell | City | Middlesex Co, MA | 27,436 | seat of justice with Cambridge & Concord, water by Concord & Merrimac rivers |
| Lowell | PO | Washington Co, OH | ||
| Lowell | PO | Randolph Co, GA | ||
| Lowell | PO | Henry Co, IA | ||
| Lowell | PO | Johnson Co, NC | ||
| Lowell | PO | Dodge Co, WI | ||
| Lowell | PO | Kent Co, MI | ||
| Lowell | PO | Oneida Co, NY | ||
| Lowell | PO | La Salle Co, IL | ||
| Lowellville | PO | Mahoning Co, OH | ||
| Lower | T | Cape May Co, NJ | 604 | water by Delaware bay, Atlantic ocean and Pond, New England & Cox Hill creeks |
| Lower Alloways' Creek | T | Salem Co, NJ | 1,423 | water by Hope, Deep & Muddy creeks |
| Lower Bartlett | PO | Coos Co, NH | ||
| Lower Bern | PO | Bern twp, Berks Co, PA | ||
| Lower Chanceford | PT | York Co, PA | water by Susquehanna river, Tom's & Muddy creeks, Orson's run | |
| Lower Chichester | PT | Delaware Co, PA | 1,552 | water by Hook creek |
| Lower Columbia | PO | Coos Co, NH | ||
| Lower Dublin | T | Philadelphia Co, PA | 2,294 | water by Pennypack creek & Saw Mill river |
| Lower Gilmanton | PO | Gilmanton twp, Belknap Co, NH | ||
| Lower Lawrence | PO | Washington Co, OH | ||
| Lower Loutre | T | Montgomery Co, MO | ||
| Lower Macungie | T | Lehigh Co, PA | 2,353 | |
| Lower Mahandy | T | Northumberland Co, PA | 1,474 | |
| Lower Hahantango | PT | Schuylkill Co, PA | 1,505 | water by Deep & Swatara creeks |
| Lower Marlborough | PV | Calvert Co, MD | ||
| Lower Merion | PT | Montgomery Co, PA | 3,517 | water by Schuylkill river, Mill & Cobb creeks |
| Lower Middleton | B | Swatara twp, Dauphin Co, PA | water by Swatara & Susquehanna rivers, Pennsylvania & Union canals | |
| Lower Mount Bethel | T | Northampton Co, PA | 3,117 | |
| Lower Nazareth | T | Northampton Co, PA | 1,297 | water by Manookisy creek |
| Lower Newport | PO | Washington Co, OH | ||
| Lower Oxford | PT | Chester Co, PA | 1,341 | water by tributaries of Octarara & Elk creeks |
| Lower Peach Tree | PO | Wilcox Co, AL | ||
| Lower Paxton | T | Dauphin Co, PA | 1,572 | water by Beaver & Paxton's creeks |
| Lower Penn's Neck | T | Salem Co, NJ | 1,429 | water by Salem river |
| Lower Providence | T | Montgomery Co, PA | 1,961 | water by Perkiomen & Shippack creeks |
| Lower Salem | PO | Salem twp, Washington Co, OH | ||
| Lower Salford | T | Montgomery Co, PA | water by tributaries of Perkiomen & Shippack creeks | |
| Lower Sandusky | V, CH | Sandusky twp, Sandusky Co, OH | seat of justice, water by Sandusky river | |
| Lower Saucon | PO | Northampton Co, PA | water by Lehigh river & Saucon creek | |
| Lower Squankum | PO | Monmouth Co, NJ | ||
| Lower Smithfield | T | Monroe Co, PA | ||
| Lower Swatara | T | Dauphin Co, PA | 759 | water by Susquehanna river & Spring creek |
| Lower Three Runs | PO | Barnwell dist, SC | ||
| Lower St Clair | T | Alleghany Co, PA | 5,930 | water by Monongahela & Ohio rivers |
| Lower Wakefield | T | Bucks Co, PA | 1,746 | |
| Lower Waterford | PO | Caledonia Co, VT | ||
| Lower Windsor | T | York Co, PA | 1,923 | |
| Lowery | PO | Barnwell dist, SC | ||
| Loweville | PO | Meriwether Co, GA | ||
| Lowhill | PT | Lehigh Co, PA | 1,021 | |
| Lowndes | PO | Wayne Co, MO | ||
| Lowndesborogh | PV | Lowndes Co, AL | seat of justice | |
| Lowndesville | PV | Abbeville dist, SC | ||
| Lowrance's Mill | PO | Lincoln Co, NC | ||
| Lowry | PO | Athens Co, OH | ||
| Lowryville | PO | Hardin Co, TN | ||
| Low's Corner | PO | Sullivan Co, NY | ||
| Lowville | PT | Lewis Co, NY | 2,377 | water by Black river |
| Lowville | PO | Columbia Co, WI | ||
| Loyd | PO | Ulster Co, NY | ||
| Loydsville | PO | Benton Co, AL | ||
| Loydsville | PO | Belmont Co, OH | ||
| Loyalahannah | PT | Westmoreland Co, PA | 1,258 | |
| Loyalsock | T | Lycoming Co, PA | 1,581 | |
| Loy's Cross Roads | PO | Anderson Co, TN |