Area Code Lookup
What Area Code Is Castleton?
Area code 309 · Illinois
Castleton uses area code 309. It is located in Illinois.
Area Code Serving Castleton
Frequently Asked Questions
What area code is Castleton?
Castleton uses area code 309. It is located in Illinois.
How do I call Castleton from outside the US?
To call Castleton from abroad, dial +1 followed by the area code and 7-digit local number (e.g. +1-309-XXX-XXXX). The +1 is the country code for all NANPA countries.