Area Code Lookup
What Area Code Is Crystal Lake?
Area code 779 · Illinois
Crystal Lake uses area code 779. It is located in Illinois.
Area Code Serving Crystal Lake
Frequently Asked Questions
What area code is Crystal Lake?
Crystal Lake uses area code 779. It is located in Illinois.
How do I call Crystal Lake from outside the US?
To call Crystal Lake 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.