Atlanta, Georgia · EST/EDT (UTC-5) · United States
Atlanta metro overlay — Marietta, Alpharetta, Decatur, Sandy Springs
Atlanta metro overlay for 404 and 770, covering the rapidly growing northern suburbs including Alpharetta (Atlanta's tech corridor) and Sandy Springs. Greater Atlanta (5.8M metro) is home to Coca-Cola, Delta Air Lines, CNN, Home Depot, and UPS global headquarters. 678 numbers are especially common in Atlanta's thriving tech and startup scene.
Dial 1 + 678 + 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 + 678 + number. From most countries, the format is +1-678-XXX-XXXX.
Area code 678 is in EST/EDT (UTC-5). Business hours are typically 9:00 AM – 5:00 PM local time. Remember that clocks shift during DST (March–November).
While (678) 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.