| Rockville to Yonkers (New York) | 216.41 mi (348.28 km) |
| Rockville to Yorba Linda (California) | 2,265.59 mi (3,646.11 km) |
| Rockville to York (Pennsylvania) | 64.97 mi (104.56 km) |
| Rockville to Yorktown (Indiana) | 450.96 mi (725.74 km) |
| Rockville to Yorkville (Illinois) | 620.06 mi (997.90 km) |
| Rockville to Youngstown (Ohio) | 231.16 mi (372.02 km) |
| Rockville to Youngsville (Louisiana) | 1,045.65 mi (1,682.81 km) |
| Rockville to Ypsilanti (Michigan) | 402.95 mi (648.49 km) |
| Rockville to Yuba City (California) | 2,360.20 mi (3,798.37 km) |
| Rockville to Yucaipa (California) | 2,223.03 mi (3,577.61 km) |
| Rockville to Yucca Valley (California) | 2,187.57 mi (3,520.56 km) |
| Rockville to Yukon (Oklahoma) | 1,156.41 mi (1,861.06 km) |
| Rockville to Yulee (Florida) | 634.85 mi (1,021.69 km) |
| Rockville to Yuma (Arizona) | 2,126.17 mi (3,421.74 km) |
| Rockville to Zachary (Louisiana) | 982.38 mi (1,580.99 km) |
