Area Code 331 Details and Prefixes
General Details about Area Code 331
Country United States
State / Province / Territory Illinois
Major City Unknown
Time Zone Unknown

Area Code 331 Prefixes

Prefix County Usage Type
331-200-xxxx Cook
331-201-xxxx Dupage
331-202-xxxx Dupage
331-203-xxxx Kane
331-204-xxxx Cook
331-205-xxxx Kane
331-206-xxxx Kane
331-207-xxxx Kendall
331-208-xxxx Kane
331-209-xxxx Dupage
331-210-xxxx Kane
331-212-xxxx Kane
331-213-xxxx Dupage
331-214-xxxx Dupage
331-215-xxxx Dupage
331-216-xxxx Kendall
331-218-xxxx Dupage
331-220-xxxx Kane
331-221-xxxx Dupage
331-222-xxxx Kane
331-223-xxxx Kane
331-225-xxxx Dupage
331-228-xxxx Kane
331-229-xxxx Dupage
331-234-xxxx Kane
331-240-xxxx Dupage
331-245-xxxx Cook
331-248-xxxx Kane
331-250-xxxx Kane
331-251-xxxx Dupage
331-254-xxxx unknown
331-256-xxxx Kane
331-262-xxxx Kane
331-281-xxxx Dupage
331-301-xxxx Kane
331-302-xxxx Kane
331-303-xxxx Kane
331-305-xxxx Dupage
331-318-xxxx Cook
331-330-xxxx Kendall
331-332-xxxx Dupage
331-333-xxxx Dupage
331-422-xxxx Kane
331-425-xxxx Kane
331-431-xxxx Kane
331-442-xxxx Kane
331-444-xxxx Dupage
331-452-xxxx Kane
331-454-xxxx Kane
331-456-xxxx Dupage
331-457-xxxx Dupage
331-462-xxxx Dupage
331-465-xxxx Dupage
331-472-xxxx Dupage
331-481-xxxx Dupage
331-551-xxxx Dupage
331-575-xxxx Kane
331-588-xxxx Kane
331-625-xxxx Dupage
331-642-xxxx Dupage
331-643-xxxx Kane
331-645-xxxx Dupage
331-684-xxxx Kane
331-702-xxxx Dupage
331-703-xxxx Dupage
331-725-xxxx Kendall
331-777-xxxx Dupage
331-801-xxxx unknown
331-803-xxxx Cook
331-825-xxxx unknown
331-826-xxxx Dupage
331-888-xxxx Dupage
331-903-xxxx unknown
331-999-xxxx Kendall