Area Code Lookup
What Area Code Is New Castle?
3 area codes serve New Castle
New Castle is served by area codes 302, 765, 878. It spans Delaware and Indiana and Pennsylvania.
Area Codes Serving New Castle
Frequently Asked Questions
What area code is New Castle?
New Castle is served by area codes 302, 765, 878.
Why does New Castle 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). New Castle now has 3 area codes — 302 and 765 and 878 — covering the same or overlapping areas.
How do I call New Castle from outside the US?
To call New Castle from abroad, dial +1 followed by the area code and 7-digit local number (e.g. +1-302-XXX-XXXX). The +1 is the country code for all NANPA countries.