Area Code 550: Ohio, Ohio
550 is a telephone area code serving Ohio. It is part of the North American Numbering Plan and is dialed with the country code +1.
Numbers beginning with 550 are located in Ohio, United States (NANP region: Southwest).
How to Dial Area Code 550
| Calling from | What to dial |
|---|---|
| Anywhere in the US or Canada | 1 550 XXX-XXXX (10-digit dialing: 550 + 7-digit number) |
| Local call inside the same area code | 7-digit number in most areas; 10 digits where an overlay code is active |
| From the UK or Europe | 00 1 550 XXX XXXX |
| From Australia | 0011 1 550 XXX XXXX |
| From a mobile phone anywhere | +1 550 XXX XXXX |
Whatever country you are calling from, the + symbol replaces the exit code. Save the contact as +1 550 XXXXXXX and it will dial correctly from any phone in the world.
Time Zone for Area Code 550
Calls to a 550 number ring in the America/New_York time zone, standard offset UTC-05:00. Daylight saving time applies here, so the offset moves forward one hour from March to November.
Other Area Codes in Ohio
These codes also serve Ohio. Area codes are assigned by the North American Numbering Plan Administration (NANPA).
| Area Code | Cities / Coverage |
|---|---|
| 216 | Cleveland |
| 220 | Columbus (overlay) |
| 234 | Akron (overlay) |
| 326 | Dayton (overlay for 937) |
| 330 | Akron, Canton, Youngstown |
| 380 | Columbus (overlay) |
| 419 | Toledo |
| 440 | Cleveland suburbs |
| 513 | Cincinnati |
| 567 | Toledo (overlay) |
| 614 | Columbus |
| 740 | Athens, Zanesville |
| 937 | Dayton |
See all 14 area codes in Ohio →
Frequently Asked Questions
Where is area code 550?
Area code 550 is in Ohio, United States. It covers Cincinnati (overlay for 513).
What time zone is area code 550 in?
Area code 550 rings in the America/New_York time zone (UTC-05:00 standard).
Do I need to dial 1 before area code 550?
Yes, for a long-distance call inside the US and Canada you dial 1 first, then 550, then the seven-digit number. The 1 is the North American long-distance trunk prefix — it is not the country code. From outside North America you dial your exit code then 1 then 550.
Is area code 550 toll-free?
No. 550 is a standard geographic area code, so normal long-distance rates apply unless your plan includes them. Toll-free NANP codes are 800, 833, 844, 855, 866, 877 and 888.