You need to specify which country for this question to be answerable.
There is no area code 966 in North America (USA, Canada, etc.).
Telephone country code +966 is Saudi Arabia.
(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 North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
I'm guessing you are referring to telephone country code +966, city code 6.
Country code +966 is Saudi Arabia. Saudi Arabian area code 06, or +966 6 in international format, serves a region in the center of the country, including Al-Qassim, Buraidah, Majma, and Hail.
(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 North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
Country code +966 is Saudi Arabia, and +966 59 is a Zain mobile number.
The country code and area code of D.I.Khan, Pakistan is 92, (0)966.
The country code and area code of Arriaga, Mexico is 52, (01)966.
The country code and area code of Makkah, Saudi Arabia is 966, (0)2.
The country code and area code of Ashikita District- Kumamoto, Japan is 81, (0)966.
Country code +969 is currently unassigned.
Telephone country code +966 is Saudi Arabia. A number beginning with +966 5 is a mobile phone from Saudi Arabia.
+966
It is 966-
Country code +966 is Saudi Arabia.
The country code for Saudi Arabia is +966, and Jubail is in area code 03, which becomes +966 3 in international format.(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 North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
Dhahran is located in Eastern Province, Saudi Arabia. Dhahran's postal code is 31261 and it's area code is 966-13.