Area Code Lookup
What Area Code Is Catonsville?
2 area codes serve Catonsville · Maryland
Catonsville is served by area codes 410, 443. It is located in Maryland.
Area Codes Serving Catonsville
Frequently Asked Questions
What area code is Catonsville?
Catonsville is served by area codes 410, 443. It is located in Maryland.
Why does Catonsville 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). Catonsville now has 2 area codes — 410 and 443 — covering the same or overlapping areas.
How do I call Catonsville from outside the US?
To call Catonsville from abroad, dial +1 followed by the area code and 7-digit local number (e.g. +1-410-XXX-XXXX). The +1 is the country code for all NANPA countries.