Ottawa, Ontario · EST/EDT (UTC-5) · Canada
Ottawa and eastern Ontario overlay
Overlay for 613. Additional capacity for Canada's capital region.
Dial 1 + 343 + 7-digit number for calls from outside the area. 10-digit dialing is mandatory in this area due to overlay codes.
From outside Canada: dial your country's exit code + 1 + 343 + number. From most countries, the format is +1-343-XXX-XXXX.
Area code 343 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 (343) 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.