In North America (USA, Canada, etc.), area code 815 is northern Illinois outside the Chicago metropolitan area. The 815-315 prefix is assigned to Rockford, Illinois.
815
McHenry, Illinois, has been in area code 815 since the introduction of the original area code system in 1947. On March 17, 2007, area code 779 was added as an overlay on 815.
Bourbonnais, Illinois, is in area code 815 and overlay code 779.
January 7, 1984 http://en.wikipedia.org/wiki/Area_code_818
The country code and area code of DelvinÌÇ, Albania is 355, (0)815.
Maybe.Rockford, Illinois, is in the 815 & 779 area code overlay. That means that local numbers will include both 815 and 779. However, just as some 815 numbers are long distance, so are some 779 numbers.
Stockton, California, is in area code +1 209.Stockton, Indiana, is in area code +1 812.Stockton, Missouri, is in area code +1 417.Stockton, Illinois, is in area code +1 815 and overlay area code +1 779.Stockton, New Jersey, is in area code +1 609.(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.)
The country code and area code of MCC, Russian Federation is 7, (8)49690.
815
The area of Oecusse District is 815 square kilometers.
The area of Tacacoma Municipality is 815 square kilometers.
Downtown Chicago is area code 312. The rest of Chicago is 773. Area code 872 is an overlay on all of the city of Chicago.Area codes 708, 847, 224, 630, 331, 815, and 779 serve various suburbs of Chicago.The telephone country code for the USA (and also Canada and certain nearby 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 North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)