Rapid City, South Dakota is close to the interstate highway I-90. It is neighboring other cities: Box Elder, SD (12.6mi/18m ); Piedmont, SD (12.1mi/16m ); Nemo, SD (19mi/34m ). You can get to the city from exit 55 of i90 (6.4mi/10m ); exit 57 of i90 (5.8mi/9m ); exit 58 of i90 (4.6mi/8m ). Rapid City, South Dakota can reach interstate highways: i90 (6.4mi/10m ); i25 (213.8mi/4.1h ); i94 (235.1mi/4.6h ). It is also close to local highways: US 14 SD (8.5mi/11m ); US 16 SD (2.7mi/6m ); US 385 SD (20.1mi/34m ).