Potomac Maryland Traffic 2024-12-22 Roadnow Weather | Gas | Restaurants | Hotels | Car Repair | Convenience Stores Cities close to Potomac Maryland Rockville, MD 6.91 mi Bethesda, MD 7.03 mi Cabin John, MD 7.54 miInterstate highway exits close to Potomac Maryland Exit 4b a, i270md 4.60 mi Exit 2, i270md 4.92 mi Exit 38, i495md 4.99 miInterstate highways close to Potomac Maryland i270md map 4.60 mi i495md map 4.99 mi i495va map 4.99 miState roads close to Potomac Maryland MD 189 map 0.41 mi MD 190 map 1.94 mi MD 191 map 3.84 mi