Lookup Area Code 312, Central Office & Exchange Code 204

The area code indicates the regional location of the phone number. According to NANP, there are 405 area codes in North America.

Of these, 326 are in the US, 42 are in Canada, 17 are non-geographic virtual number, and 20 are others(mostly Caribbean).

The number of area codes is different for each area, in the future, the area with the most phone number users will have more area codes.

312204 is phone number first 6-digit, in the full phone number 312204xxxx, 312 is the Area Code, 204 is the Central Office & Exchange Code, xxxx is the subscriber number.

All North American phone numbers are in a three-part format.

Determine the phone number format, it can accurately lookup phone number information.

According to area code 312, determine the regional location

State: Illinois

Region: Illinois

Center City: Chicago

Area Code: 312 Area Code

State: Illinois

Center City: Chicago

Phone Used: (312) 204-

Primary City: Chicago, IL

Owned Company: Ameritech Illinois

County: Cook

Owned Type: Landline

Owned Carrier: Ameritech Illinois

Counties: Cook County

Full Zip Code: 60610 (50%), 60611 (25%), 60614 (19%), 60601 (6%)

State & Region & County & City & Location map with Area Code

Too many area codes, map size limit, all area codes may not be displayed, only major area codes.

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312204 is the first 6-digit of the phone number, it can only lookup the regional location.

Lookup a phone number, the number must be complete. The full phone number is 10-digit, 312204-xxxx, 312 is the area code, 204 is the central office number, telephone exchange code, the last four digits, xxxx is the subscriber number, real phone users number.

Below is the complete, (312)204-xxxx active phone numbers, contains used, unused, and possibly deregistered phone numbers.

3122040003 3122040008 3122040002 3122040007 3122040000 3122040005 3122040009 3122040004 3122040001 3122040006 3122040013 3122040018 3122040012 3122040017 3122040010 3122040015 3122040019 3122040014 3122040011 3122040016 3122040023 3122040028 3122040022 3122040027 3122040020 3122040025 3122040029 3122040024 3122040021 3122040026 3122040033 3122040038 3122040032 3122040037 3122040030 3122040035 3122040039 3122040034 3122040031 3122040036 3122040043 3122040048 3122040042 3122040047 3122040040 3122040045 3122040049 3122040044 3122040041 3122040046 3122040053 3122040058 3122040052 3122040057 3122040050 3122040055 3122040059 3122040054 3122040051 3122040056 3122040063 3122040068 3122040062 3122040067 3122040060 3122040065 3122040069 3122040064 3122040061 3122040066 3122040073 3122040078 3122040072 3122040077 3122040070 3122040075 3122040079 3122040074 3122040071 3122040076 3122040083 3122040088 3122040082 3122040087 3122040080 3122040085 3122040089 3122040084 3122040081 3122040086 3122040093 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Above active phone number (312)204-xxxx list, from the telephone operator number database. Phone Lookuper does not provide number identification services. If you have any questions about this information, welcome to contact us.