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Coordinates: 41°50′N 88°06′W. All NPAs within Illinois. Area codes 630 and 331 are telephone area codes in the North American Numbering Plan (NANP) for portions of Chicago 's near and far western suburbs, including the majority of DuPage County, Illinois. To the northwest, the numbering plan area (NPA) also includes a small portion of ...
Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, and 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing code in the group NXX for various other purposes.
With the depletion of new numbers in area codes 312 and 773, an overlay of both of them, area code 872, was created in November 2009, beginning ten-digit dialing within the city limits of Chicago. The remaining area without an overlay in the northern part of Illinois, 708, eventually received such with area code 464 taking effect on January 21 ...
Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917.
L002 3-Digit ZIP Code Prefix Matrix, Effective Date 2017-04-01, from USPS Facility Access and Shipment Tracking (FAST) L005 3-Digit ZIP Code Prefix Groups—SCF Sortation, Effective Date 2017-04-01, from USPS Facilities Access and Shipment Tracking (FAST) G030 Postal Zones; G042 Pricing and Classification Service Center
Telephone prefix. A telephone prefix is the first set of digits after the country, and area codes of a telephone number. In the North American Numbering Plan countries (country code 1), it is the first three digits of a seven-digit local phone number, the second three digits of the 3-3-4 scheme. In other countries, both the prefix and the ...
Area code 312. Coordinates: 41°52′48″N 87°37′54″W. All NPAs within Illinois. Area code 312 is a telephone area code in the North American Numbering Plan for the city of Chicago, including downtown, the Chicago Loop, and its immediate environs. The numbering plan area is completely surrounded by area code 773, which serves the rest of ...
Chicago Ridge is located at 41°42′9″N 87°46′43″W (41.702482, -87.778690). [6] According to the 2021 census gazetteer files, Chicago Ridge has a total area of 2.27 square miles (5.88 km 2 ), all land. [7] Located in Cook County, the village is 18 miles (29 km) southwest of the Loop.