Area Code Lookup
What Area Code Is Frederick?
3 area codes serve Frederick · Maryland
Frederick is served by area codes 227, 240, 301. It is located in Maryland.
Area Codes Serving Frederick
Frequently Asked Questions
What area code is Frederick?
Frederick is served by area codes 227, 240, 301. It is located in Maryland.
Why does Frederick have multiple area codes?
As demand for phone numbers increased, NANPA added area codes through splits (dividing the region) or overlays (layering a new code over the same geography). Frederick now has 3 area codes — 227 and 240 and 301 — covering the same or overlapping areas.
How do I call Frederick from outside the US?
To call Frederick from abroad, dial +1 followed by the area code and 7-digit local number (e.g. +1-227-XXX-XXXX). The +1 is the country code for all NANPA countries.