1850 Atlas
| Name | What | Place | Pop | Other |
| Balden Springs | PO | Chocataw Co, AL | ||
| Bladensburgh | PO | Knox Co, OH | ||
| Bladensburgh | PV | Prince George Co, MD | 1,412 | |
| Blain | PO | Perry Co, PA | ||
| Blaine | PO | Lawrence Co, KY | ||
| Blaine's Cross Roads | PO | Grainger Co, TN | ||
| Blair | PT | Huntingdon Co, PA | ||
| Blair Furnace | PO | Blair Co, PA | ||
| Blairsport | PO | Roane Co, TN | ||
| Blairstown | PT | Warren Co, NJ | 1,405 | |
| Blairsville | PB | Indiana Co, PA | 1,135 | water by Kiskiminitas river & Black Lick creek |
| Blairsville | PO | York Dist, SC | ||
| Blairsville | PV, CH | Union Co, GA | seat of justice | |
| Blairsville | PV | Posey Co, IN | ||
| Blakeley | PT | Luzerne Co, PA | 1,703 | water by Lackawanock river |
| Blakeley | PO | Stokes Co, NC | ||
| Blakeley | PV, CH | Early Co, GA | seat of justice | |
| Blakeley | PV, CH | Baldwin Co, AL | seat of justice, water by Tensaw river | |
| Blakesburgh | PO | Wapello Co, IA | ||
| Blakesville | PO | Harrison Co, IN | ||
| Blanc | PO | Lucas Co, OH | ||
| Blanchard | PT | Piscataquis co, ME | 192 | |
| Blanchard | T | Hardin Co, OH | water by Blanchard's Fork of Anglaize river | |
| Blanchard | T | Hancock Co, OH | 1,151 | |
| Blanchard | T | Putnam Co, OH | 1,395 | |
| Blanchard Bridge | PV | Blanchard Twp, Hancock Co, OH | ||
| Blanche | PO | Lafayette Co, MO | ||
| Blanchester | PO | Marion Twp, Clinton Co, OH | ||
| Blandinsville | PO | McDonough Co, IL | ||
| Blandville | PV, CH | Ballard Co, KY | ||
| Blanford | PT | Hampden Co, MA | 1,418 | water by Westfield river |
| Blanket Hill | PO | Armstrong Co, PA | ||
| Blaueltville | PV | Orangetown twp, Rockland Co, NY | ||
| Blawenburgh | PO | Somerset Co, NJ | ||
| Bleeker | PT | Fulton Co, NY | 510 | water by Caroga creek & Sacondaga river |
| Blendon | PT | Franklin Co, OH | 1,303 | water by Alum & Big Walnut creeks |
| Blendon Institute | T | Franklin Co, OH | ||
| Blenheim | T | Schoharie Co, NY | 1,314 | (PO now called South Gilboa) |
| Blink Bonny | PO | St Lawrence Co, NY | ||
| Blish's Mills | PO | Franklin Co, OH | ||
| Blissfield | PV | Blissfield Twp, Lenawee Co, MI | 924 | water by Raisin river |
| Blissville | PO | Jefferson Co, IL | ||
| Blissville | PO | Marshall Co, IN | ||
| Bliven Mills | PO | McHenry Co, IL | ||
| Block House | PO | Scott Co, VA | ||
| Blocker's | PO | Cumberland Co, SC | ||
| Blockley | T | Philadelphia Co, PA | 5,916 | water by Mill & Cobb creeks |
| Blockville | PO | Chautauque Co, NY | ||
| Blodget Mills | PO | Cortland Co, NY | ||
| Blood's Point | PO | DeKalb Co, IL | ||
| Bloody Run | PV | Providence Twp, Bedford Co, PA | water by Roystown branch of Juniata river | |
| Bloom | PT | Seneca Co, OH | 1,742 | water by Honey creek |
| Bloom | T | Columbia Co, PA | 3,122 | water by Susquehanna river & Fishing creek |
| Bloom | V | Bloom Twp, Columbia Co, PA | ||
| Bloom | T | Morgan Co, OH | water by Muskingum river | |
| Bloom | T | Sciota Co, OH | 1,648 | |
| Bloom | T | Fairfield Co, OH | ||
| Bloom | T | Wood Co, OH | 658 | |
| Bloom | PO | Rush Co, IN | ||
| Bloom | PO | Cook Co, IL | ||
| Bloomer | PO | Sebastian Co, AR | ||
| Bloomfield | PT | Somerset Co, ME | 1,301 | water by Kennebec river |
| Bloomfield | PT | Essex Co, VT | 244 | water by Connecticut & Nulhegan rivers |
| Bloomfield | PT | Hartford Co,CT | 1,412 | water by Wood river |
| Bloomfield | PT | Essex Co, NJ | 3,385 | |
| Bloomfield | PV | Bloomfield Twp, Crawford Co, PA | ||
| Bloomfield | V, CH | Juniata Twp, Perry Co, PA | seat of justice | |
| Bloomfield | PV | Loudoun Co, VA | ||
| Bloomfield | PV | Nelson Co, KY | ||
| Bloomfield | T | Knox Co, OH | ||
| Bloomfield | T | LaGrange Co, IN | 934 | |
| Bloomfield | PV, CH | Greene Co, IN | seat of justice, water by White river | |
| Bloomfield | PV | Edgar Co, IL | ||
| Bloomfield | T | Oakland Co, MI | 1,003 | water by Rouge river |
| Bloomfield | T | Trumbull Co, OH | 1,451 | |
| Bloomfield | T | Richland Co, OH | 1,430 | |
| Bloomfield | T | Logan Co, OH | 671 | |
| Bloomfield | T | Jackson Co, OH | 1,402 | water by branch of Racoon creek |
| Bloomfield | PO | Kemper Co, MS | ||
| Bloomfield | PO, CH | Davis Co, IA | 792 | |
| Bloomfield | PO | Walworth Co, WI | ||
| Bloomfield | PV, CH | Stoddard Co, MO | seat of justice | |
| Blooming Grove | PT | Orange Co, NY | water by Murderer's creek | |
| Blooming Grove | PT | Richland Co, OH | ||
| Blooming Grove | PO | Montgomery Co, TN | ||
| Blooming Grove | PO | Franklin Co, IN | ||
| Blooming Valley | PO | Crawford Co, PA | ||
| Bloomingburgh | PV | Mamakating Twp, Sullivan Co, NY | ||
| Bloomingburgh | PV | Paint Twp, Fayette Co, OH | ||
| Bloomingdale | PO | Cabell Co, VA | ||
| Bloomingdale | PO | Jefferson Co, OH | ||
| Bloomingdale | PO | DuPage Co, IL | ||
| Bloomingdale | V | Co of NY | water by Hudson river | |
| Bloomingsburgh | PO | Fulton Co, IN | ||
| Bloomingsport | PO | Randolph Co, IN | ||
| Bloomington | PV, CH | Monroe Co, IN | 879 | seat of justice |
| Bloomington | PV | McLean Co, IL | 1,594 | |
| Bloomington | PV, CH | Muscatine Co, IA | 200 | seat of justice, water by Mississippi river |
| Bloomington | PO | Clinton Co, OH | ||
| Bloomington | PV, CH | Macon Co, MO | 194 | seat of justice |
| Bloomington | PO | Morgan Co, KY | ||
| Bloomington | PO | Van Buren Co, AR | ||
| Bloomington | PO | Tipton Co, TN | ||
| Bloomington | T | Buchanan Co, MO | 2,197 | |
| Bloomingville | PV | Oxford Twp, Erie Co, OH | ||
| Bloomsburgh | PV | Columbia Co, PA | water by Susquehanna river | |
| Bloomsburgh | PV | Halifax Co, VA | ||
| Bloomsbury | PV | Warren Co, NJ | water by Muscontecoing creek | |
| Bloomville | PV | Delaware Co, NY | water by Delaware river | |
| Bloomville | PO | Seneca Co, OH | ||
| Bloomville | PO | Will Co, IL | ||
| Blossburgh | PV | Tioga Co, PA | 850 | |
| Blossom Hill | PO | Caddo parish, LA | ||
| Blount Springs | PO | Blount Co, AL | ||
| Blount's Creek | PO | Beaufort Co, NC | ||
| Blount's Ferry | PO | Columbia Co, (no state given) | ||
| Blountstown | PO | Calhoun Co, FL | ||
| Blountsville | PV, CH | Blount Co, AL | seat of justice, water by Locust fork of Black Warrior river | |
| Blountsville | PO | Jones Co, GA | ||
| Blountsville | PV, CH | Sullivan Co, TN | seat of justice | |
| Blountsville | PV | Henry Co, IN |