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Rockville, Maryland Area Codes - Click here for City Guide
| Area Code Directory | | Zip Code | City | State | County | Area Code | Time Zone | Latitude/Longitude | | 20847 | Rockville | MD | Montgomery | 301 | EST | 39.083801/-77.152901 | | 20848 | Rockville | MD | Montgomery | 301 | EST | 39.075298/-77.116501 | | 20849 | Rockville | MD | Montgomery | 301 | EST | 39.084000/-77.153702 | | 20850 | Rockville | MD | Montgomery | 301 | EST | 39.089699/-77.179802 | | 20851 | Rockville | MD | Montgomery | 301 | EST | 39.078899/-77.122704 | | 20852 | Rockville | MD | Montgomery | 301 | EST | 39.051899/-77.124199 | | 20853 | Rockville | MD | Montgomery | 301 | EST | 39.101898/-77.095200 | | 20857 | Rockville | MD | Montgomery | 301 | EST | 39.081100/-77.153900 |
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