The 312 area code is used for downtown Chicago. It is is unusual in that it is completely surrounds by another area code which is 773 and covers the rest of Chicago.
Area code 312 is downtown Chicago. It includes the Chicago Loop and the immediate area around it. The 312-273 prefix is mostly for wireless users (cell phones), but may also include some landline numbers. Area code 773, which serves the rest of Chicago, completely surrounds area code 312; area code 872 is an overlay on both 312 and 773, serving the entire city of Chicago, but not the suburbs.
US area code 872 is Chicago, IL, overlaying 312 and 773.
The country code and area code of Mhlume, Swaziland is 268, 312.
The country code and area code of Ankara, Turkey is 90, (0)312.
The country code and area code of Sawakin, Sudan is 249, (0)312.
St. Charles, Illinois, changed from area code 708 to 630 in 1996.St. Charles was in area code 312 until the 312/708 split in 1989.
It is difficult to find statistics on the exact geographic area corresponding to an area code, but the two candidates are area code 312 in downtown Chicago and area code 213 in downtown Los Angeles. Area code 312 in downtown Chicago is overlaid with area code 872, which also overlays area code 773 in the rest of Chicago.
The country code and area code of Uzhhorod, Ukraine is 380, (8~0)312.
The country code and area code of Colima- Col., Mexico is 52, (01)312.
The country code and area code of San RamÌ_n, Uruguay is 598, (0)312.
The country code and area code of Gyumri- Shirak province, Armenia is 374, (0)312.
Area code 773 is an area code for Chicago, Illinois. The city was given this area code on October 12'th, 1996. Before this code the area code was 312, for the whole city until 708 was created for the suburbs only.