Rockford, Illinois · CST/CDT (UTC-6) · United States
Rockford, DeKalb — north-central Illinois overlay
Overlay for 815. Northern Illinois University in DeKalb.
Dial 1 + 779 + 7-digit number for calls from outside the area. 10-digit dialing is mandatory in this area due to overlay codes.
From outside United States: dial your country's exit code + 1 + 779 + number. From most countries, the format is +1-779-XXX-XXXX.
Area code 779 is in CST/CDT (UTC-6). Business hours are typically 9:00 AM – 5:00 PM local time. Remember that clocks shift during DST (March–November).
While (779) is a legitimate area code, scammers can spoof any number. Never share personal info with unknown callers. Verify by calling the organization directly.
Area code data sourced from NANPA. Timezone data from IANA Time Zone Database. Last updated March 2026.