1850 Atlas
| Name | What | Place | Pop | Other |
| Log Cabin | PO | Morgan Co, OH | ||
| Log Lick | PO | Switzerland Co, IN | ||
| Logan | T | Clinton Co, PA | 263 | water by Big Fishing creek |
| Logan | PO | Hector twp, Tompkins Co, NY | ||
| Logan | PV, CH | Hocking Co, OH | 1,066 | seat of justice, water by Hockhocking river |
| Logan | PT | Dearborn Co, IN | 753 | |
| Logan | PT | Fountain Co, IN | 1,717 | |
| Logan | PV, CH | Logan Co, VA | seat of justice, water by Guyandotte river | |
| Logan | T | Wayne Co, MO | ||
| Logan Mills | PO | Clinton Co, PA | ||
| Logan's Creek | PO | Reynolds Co, MO | ||
| Logan's Ferry | PO | Alleghany Co, PA | ||
| Logan's Store | PO | Rutherford Co, NC | ||
| Logansport | PV, CH | Cass Co, IN | seat of justice, water by Wabash & Ell rivers, Wabash & Erie canals | |
| Logansport | PO | De Soto parish, LA | ||
| Loganville | PV | York Co, PA | ||
| Loganville | PV | Miami twp, Logan Co, OH | water by Miami river | |
| Loganville | PO | Walton Co, GA | ||
| Logtown | PO | Wachita parish, LA | ||
| Lombardville | PO | Cecil Co, MD | ||
| Lombardy | PO | Columbia Co, GA | ||
| Lombardy Grove | PO | Mecklenburg Co, VA | ||
| Lomira | PO | Dodge Co, WI | ||
| Lonaconing | PO | Alleghany Co, MD | ||
| London | PV, CH | Madison Co, OH | 513 | seat of justice |
| London | T | Senecea Co, OH | 1,781 | |
| London | PV, CH | Laurel Co, KY | seat of justice, water by tributary of Laurel river | |
| London | PT | Monroe Co, MI | 626 | |
| London Bridge | PV | Princess Ann Co, VA | ||
| London Britain | T | Chester Co, PA | 680 | water by White Clay creek |
| London City | PO | Fayette Co, IL | ||
| London Grove | PT | Chester Co, PA | 1,425 | water by White Clay creek |
| Londonderry | PT | Windham Co, VT | 1,274 | water by West & Windhall rivers & Utly brook |
| Londonderry | PT | Rockingham Co, NH | 1,731 | water by Beaver river |
| Londonderry | PT | Chester Co, PA | 643 | water by Doe run |
| Londonderry | T | Bedford Co, PA | 823 | water by Will's creek |
| Londonderry | T | Dauphin Co, PA | 1,587 | water by Spring & Conewago creeks |
| Londonderry | T | Lebanon Co, PA | 1,563 | water by Conewaga, Swatara & Quitapahilla creeks, Klinger's run |
| Londonderry | PT | Guernsey Co, OH | ||
| Lone Jack | PO | Jackson Co, MO | ||
| Lone Star | PO | Titus Co, TX | ||
| Lone Tree | PO | Bureau Co, IL | ||
| Long A Coming | PV | Gloucester & Waterford twps, Gloucester Co, NJ | ||
| Long Bottom | PO | Olive twp, Meigs Co, OH | ||
| Long Bottom | PO | Marshall Co, VA | ||
| Long Branch | PO | Franklin Co, VA | ||
| Long Branch | PV | Shrewsbury twp, Monmouth Co, NJ | ||
| Long Branch | PO | Monroe Co, MO | ||
| Long Cane | PO | Troup Co, GA | ||
| Long Cane | PO | Abbeville dist, SC | ||
| Long Creek | PO | New Hanover Co, NC | ||
| Long Creek | PO | Louisa Co, VA | ||
| Long Creek | PO | Panola Co, MS | ||
| Long Falls Creek | PO | Daviess Co, KY | ||
| Long Glade | PO | Augusta Co, VA | ||
| Long Green Academy | PO | Baltimore Co, MD | ||
| Long Grove | PO | Lake Co, IL | ||
| Long Hall | PO | Caldwell Co, KY | ||
| Long Hill | PO | Morris Co, NJ | ||
| Long Island | PO | Hancock Co, ME | ||
| Long John | PO | Will Co, IL | ||
| Long Lake | PO | Manitowoc Co, WI | ||
| Long Lake | PO | Marquette Co, WI | ||
| Long Lake | PO | Genesee Co, MI | ||
| Long Lane | PO | Dallas Co, MO | ||
| Long Marsh | PO | Queen Anne Co, MD | ||
| Long Meadow | PT | Hampden Co, MA | 1,253 | water by Connecticut river |
| Long Meadow | PO | Page Co, VA | ||
| Long Old Fields | PO | Prince George Co, MD | ||
| Long Pine | PO | Bedford Co, VA | ||
| Long Plain | PO | Bristol Co, MA | ||
| Long Point | PO | Livingston Co, IL | ||
| Long Point | PO | Washington Co, TX | ||
| Long Pond | PO | Caldwell Co, KY | ||
| Long Ridge | PO | Fairfield Co, CT | ||
| Long Run | PO | Jefferson Co, KY | ||
| Long Savannah | PO | Hamilton Co, TN | ||
| Long Street | PO | Moore Co, NC | ||
| Long Street | PO | Lancaster dist, SC | ||
| Long Street | PO | Pulaski Co, GA | ||
| Long Swamp | PT | Berks Co, PA | ||
| Long Swamp | PO | Marion Co, FL | ||
| Long Valley | PO | Monroe Co, PA | ||
| Long View | PO | Morgan Co, TN | ||
| Long View | PO | Bradley Co, AR | ||
| Long View | PO | Christian Co, KY | ||
| Long's Bridge | PO | Hancock Co, GA | ||
| Long's Mills | PO | Randolph Co, NC | ||
| Longmire | PO | Washington Co, TN | ||
| Longmire's Store | PO | Edgefield dist, SC | ||
| Longtown | PO | Fairfield dist, SC | ||
| Longtown | PO | Panola Co, MS | ||
| Longwood | PO | Union Co, KY | ||
| Longwood | PO | Fayette Co, IN | ||
| Longwood | PO | Sabine Co, TX | ||
| Lonsdale | PO | Providence Co, RI | ||
| Lonsville | PO | Pike Co, KY | ||
| Look Out | PO | Cole Co, MO | ||
| Looking Glass | PO | Clinton Co, IL | ||
| Loomisville | PO | Kent Co, MI | ||
| Looney's Creek | PO | Marion Co, TN | ||
| Looniesville | PO | Seneca Co, MO | ||
| Loose Creek | PO | Osage Co, MO | ||
| Looxahoma | PO | De Soto Co, MS | ||
| Lorado | PO | Greene Co, AR | ||
| Loramie's | PT | Shelby Co, OH | ||
| Loran | PO | Whitley Co, IN | ||
| Lorain | T | Shelby Co, OH | 1,049 | |
| Lorain | PT | Tippecanoe Co, IN | 1,611 | |
| Lorance | T | Cape Girardeau Co, MO | ||
| Lordstown | PT | Trumbull Co, OH | 1,329 | |
| Lorentz Store | PO | Lewis Co, VA | ||
| Lorenzoville Foundry | PO | Shenandoah Co, VA | ||
| Loretto | PV | Alleghany twp, Cambria Co, PA | 193 | |
| Loretto | PO | Essex Co, VA | ||
| Loretto | PO | Marion Co, KY | ||
| Lorraine | PT | Jefferson Co, NY | 1,511 | water by Sandy creek |
| Los Angelos | PV, CH | Los Angelos Co, CA | seat of justice | |
| Loss Creek | PO | Crawford Co, OH | ||
| Lost Creek | PO | Harrison Co, VA | ||
| Lost Creek | PO | Campbell Co, TN | ||
| Lost Creek | T | Miami Co, OH | 1,064 | |
| Lost Creek | PO | Lincoln Co, MO | ||
| Lost Grove | PO | De Kalb Co, IL | ||
| Lost Mountain | PO | Cobb Co, GA | ||
| Lost River | PO | Orange Co, IN | ||
| Lost River | PO | Hardy Co, VA | ||
| Lost Village | PO | New Madrid Co, MO | ||
| Lottridge | PO | Athens Co, OH | ||
| Lott's | PO | Edgefield dist, SC | ||
| Lottsville | PV | Warren Co, PA | water by Little Broken Straw creek | |
| Loudon | PT | Merrimac Co, NH | 1,552 | water by Soucook river |
| Loudon | PT | Peters twp, Franklin Co, PA | 1,228 | water by west branch of Connecocheague creek |
| Loudon | PT | Seneca Co, OH | 1,781 | |
| Loudon | T | Carroll Co, OH | 840 | |
| Loudon | T | Monroe Co, MI | 626 | |
| Loudon Centre | PO | Loudon twp, Merrimac Co, NH | ||
| Loudon Ridge | PO | Loudon twp, Merrimac Co, NH | ||
| Loudonville | PV | Hanover twp, Ashland Co, OH | water by Black fork of Mohican creek | |
| Loudsville | PV | Habersham Co, GA | water by sources of Chestatee river in the gold region |