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| Patapsco Valley | |
|---|---|
| Patapsco River Valley | |
 McKeldin Rapids, McKeldin Recreation Area | |
  Patapsco Valley Location of the Patapsco Valley in Maryland | |
| Floor elevation | 260 |
| Length | 39 miles (63 km) North-South |
| Geography | |
| Location | Anne Arundel County, Baltimore County, Howard County, Carroll County, Maryland |
| Population centers | Brooklyn Park Catonsville Ellicott City Elkridge Lansdowne Linthicum Marriottsville Daniels Hanover Sykesville Woodbine Woodstock |
| Borders on | Elkridge Landing(south) Liberty Reservoir (north) |
| Coordinates | 39°17′N 76°47′W / 39.29°N 76.78°W |
| Traversed by | Interstate 70 Interstate 95 Metropolitan Boulevard (I-195) Harbor Tunnel Thruway (I-895) Annapolis Road (MD 648) Belle Grove Road (MD 170) Frederick Road (MD 144) US Route 40 Nursery Road Rolling Road (MD 166) Old Court Road (MD 125) Montgomery Road Old Washington Road (MD 97) Sykesville Road (MD 32) Woodbine Road (MD 94) |
The Patapsco Valley is a small valley surrounding the Patapsco River in central Maryland. The region is known for its historical significance as a major economic and industrial center in the eighteenth and nineteenth centuries.