| distance | reference number | name | latitude | longitude |
| 229.7 | 503 | Chain Bridge, Washington, D.C. | 38.9333 | -77.1167 |
| 231.1 | 502 | Chain Bridge, one mile below, Washington, D.C. | 38.9167 | -77.1 |
| 231.8 | 1825 | Middle Branch, Patapsco River, Baltimore Harbor, Ma | 39.2667 | -76.6333 |
| 233.0 | 1495 | Key Bridge, Washington, D.C. | 38.9 | -77.0667 |
| 233.1 | 969 | Fells Point, Baltimore Harbor, Maryland | 39.2833 | -76.5833 |
| 234.1 | 137 | Baltimore (Fort McHenry), Maryland | 39.2667 | -76.5783 |
| 235.8 | 273 | Bladensburg, Anacostia River, Maryland | 38.9333 | -76.9383 |
| 235.9 | 3268 | Washington, Potomac River, D.C. | 38.8733 | -77.0217 |
| 236.5 | 233 | Benning Bridge, Anacostia River, Washington, D.C. | 38.9 | -76.9667 |
| 236.7 | 2509 | Reagan National Airport, Washington, D.C. | 38.85 | -77.0333 |
| 236.9 | 59 | Anacostia Bridge, Anacostia River, Washington, D.C. | 38.8667 | -77 |
| 237.5 | 222 | Bellevue, Washington, D.C. | 38.8333 | -77.0333 |
| 238.5 | 1251 | Hawkins Point, Patapsco River, Maryland | 39.2083 | -76.5333 |
| 238.8 | 1019 | Fort Carroll, Patapsco River, Maryland | 39.2167 | -76.5167 |
| 239.1 | 35 | Alexandria, Virginia | 38.8 | -77.0333 |
| 240.7 | 2369 | Port Deposit, Susquehanna River, Maryland | 39.6 | -76.1167 |
| 240.8 | 319 | Bowley Bar, Middle River, Maryland | 39.3 | -76.3833 |
| 241.6 | 172 | Battery Point, Gunpowder River, Maryland | 39.3333 | -76.3333 |
| 242.2 | 2574 | Rocky Point, Back River, Maryland | 39.25 | -76.4 |
| 242.3 | 2042 | North Point, Patapsco River, Maryland | 39.2 | -76.45 |
| 242.6 | 1903 | Mount Vernon, Virginia | 38.7 | -77.0833 |
| 242.7 | 1183 | Gunston Cove, Virginia | 38.6667 | -77.1333 |
| 242.7 | 2339 | Pond Point, Bush River, Maryland | 39.3883 | -76.255 |
| 242.9 | 1767 | Marshall Hall, Maryland | 38.6833 | -77.1 |
| 243.2 | 1266 | High Point, Occoquan Bay, Virginia | 38.6167 | -77.2 |