To call a mobile phone in United States from Vietnam use the following dialing code format: 00 + 1 + The Number Click here to search for another mobile country code.
The Ohio, United States area code chart below gives you the necessary information for calling Ohio cities. For international dialing instructions to Ohio, United States, use our drop down boxes at the top of this page or check out our easy-to-use country code search tool.
We hope Country Calling Codes has helped you make your international call from Vietnam to the state of Ohio, United States. Why not bookmark this page, then tell a friend how easy it is to find international country codes and area codes at CountryCallingCodes.com!