Rockville City Area Code List
| Area Codes | Country | State | City | Time Zone | Operating |
|---|---|---|---|---|---|
| 240 | US | Maryland - MD | Rockville | Eastern | Details |
| 301 | US | Maryland - MD | Rockville | Eastern | Details |
| 308 | US | Nebraska - NE | Rockville | Central / Mountain | Details |
| 660 | US | Missouri - MO | Rockville | Central | Details |
| 765 | US | Indiana - IN | Rockville | Eastern | Details |
| 804 | US | Virginia - VA | Rockville | Eastern | Details |
| 860 | US | Connecticut - CT | Rockville | Eastern | Details |