The area codes for Ohio are 216, 234, 283, 330, 380, 419, 440, 513, 567, 614, 740, and 937.
Ohio has multiple area codes:
216: Cleveland
330 & 234: Akron, Canton, Youngstown
419 & 567: Toledo
440: Ahstabula, Lorain
513: Cincinnati
614: Columbus
740 & 220: Marion, Zanesville (220 overlay in 2015)
937: Dayton
The telephone country code for the USA (plus Canada and 18 Caribbean-ish islands) is +1.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
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Thirteen area codes are assigned to Ohio, but only ten are currently in use. Ohio is geographically divided into eight area code areas, two of which each have two area codes in an overlay.
Ohio's current area codes are...
In the future, 283 will overlay 513, and 380 will overlay 614. On April 22, 2015, area code 220 will overlay 740.
216 is the area code for the City of Cleveland proper and a number of its suburbs. Other area codes in the Greater Cleveland area are 330/234 and 440.
Cellphones in the US use the same geographic area codes as landlines. Ohio has several area codes.