Area Code Lookup
What Area Code Is De Kalb?
Area code 779 · Illinois
De Kalb uses area code 779. It is located in Illinois.
Area Code Serving De Kalb
Frequently Asked Questions
What area code is De Kalb?
De Kalb uses area code 779. It is located in Illinois.
How do I call De Kalb from outside the US?
To call De Kalb from abroad, dial +1 followed by the area code and 7-digit local number (e.g. +1-779-XXX-XXXX). The +1 is the country code for all NANPA countries.