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Roundabouts on the Maryland State Highway System

24 existing, 7 under construction

Anne Arundel County
Baltimore County
Caroline County
Carroll County
Cecil County
Frederick County
Harford County
Howard County
Kent County
Prince George's County
Queen Anne's County
Washington County

Anne Arundel County (2)

• MD 2 @ MD 408/ MD 422
• MD 450 @ Taylor Avenue/Spa Road 
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Baltimore County (3)

• MD 45 (York Rd.) @ MD 146 (Dulaney Valley Rd.)/Joppa Rd./Allegheny Ave.
• MD 139 (Charles St.) @ Bellona Ave./Ramp to I695
• MD 372 @ Hilltop Road/Entrance to UMBC 
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Caroline County (1)

• MD 307 @ MD 313/MD 318 
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Carroll County (1)

• MD 140 @ MD 832/Antrim Boulevard 
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Cecil County (1)

• MD 213 @ Leeds Road/Elk Mill Road
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Frederick County (3)

• MD 17 @ B Street/Maryland Avenue
• MD 17 @ MD 180
• MD 80 @ Sugarloaf Parkway 
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Harford County (2)

• MD 7 @ Holly Oaks Drive
• MD 165 @ MD 24 
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Howard County (7, 1 under construction)

• MD 94 @ MD 144
• MD 94 @ Old Frederick Road
• MD 100 @ MD 103 Interchange (2 roundabouts)
• MD 100 @ Snowden River Parkway Interchange
• MD 100 @ MD 104 Interchange
• US 29 @ MD 216 Interchange 
• US 29 @ HopkinsGorman Road Interchange (under construction, 2001)
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Kent County (2)

• US 301 @ MD 291 Interchange (2 Roundabouts) 
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Prince Georges County (6 under construction)

• US 1 @ 34th Street/Perry Street (under construction, 2001)
• MD 193 @ Oak Grove Rd. (under construction, 2001)
• MD 637 @ Good Hope Ave. (under construction, 2001)
• MD 637 @ Oxon Run Dr. (under construction, 2001)
• I95 @ RitchieMarlboro Road Interchange (2 roundabouts) (under construction, 2002) 
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Queen Anne's County (1)

• MD 18 @ Castle Marina Road
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Washington County (1)

• MD 63 @ MD 58/Cearfoss Pike
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All content contained within these materials is the intellectual property of Maryland State Highway Administration.

© 2000 Maryland State Highway Administration.
Last modified: Tuesday July 9, 2000.