Illinois Area Code Directory Information

The Numbering Plan Areas or the NPAs are smaller areas divided by the NANP. These NPA have unique three digit code which identifies the areas and these are called area codes. To know about a particular area code, one can use the area code search. With the help of these search tools, you can also find out the area code for a specific city or town, which has a population of more than 20,000.

There are various NPA reports which are generated by the NANPA. These reports are useful tools to identify a geographical area code. The reports also identify planned area codes which are not operational.

NPA Allocation Plan and Assignment Guidelines used by NANPA prepared by ATIS sponsored Industry Numbering Committee to administer area codes.  NXX is the format of an area code; here N is any digit 2 through 9 and X is any digit 0 through 9.

Area Codes in Illinois

There are 12 area codes in the state of Illinois. Illinois covers 102 counties. Illinois has a population of around 12,419,293. AT&T and Bell Laboratories jointly developed the area code system in the year 1940’s. But the system came into effect in the year 1947. This system is known as the North American Numbering Plan or the NANP. NANP is used widely in United States and Canada.

Illinois area codes are the original area codes which were established in 1947. The original area codes were 217, 312, 618 and 815.

There are as many as 12 area codes in the state of Illinois. The 12 area codes are 217, 224, 309, 312, 331, 618, 630, 708, 773, 779, 815 and 847. Illinois includes 102 counties.

Area Code 217

Area code 217 covers 44 counties with a population of around 1,133,780. Some of the counties which fall under the area code 217 are Adams, Bond, Brown, Cass, Champaign, Christian, Clark, Coles, Cook, Crawford, Cumberland, Dewitt, Douglas, Edgar, Effingham, Fayette, Ford, Greene, Hancock, Henderson, Iroquois, Jasper, Knox, Livingston, Logan, Macon, Macoupin, Madison, Mason, McDonough, McLean, Menard, Montgomery, Morgan, Moultrie, Piatt, Pike, Saline, Vermilion and others. Area code 217 covers 340 cities and it has 728 exchanges.

Area Code 224

Area code 224 covers 5 counties and it has a population around 402,693. 5 counties which fall under area code 224 are Cook, Dupage, Kane, Lake and McHenry. There are 50 cities which fall under the area code 224. These cities are Algonquin, Antioch, Arlington Heights, Arlington HTS, Barrington, Cary, Chicago, Deerfield, Des Plaines, Dundee, Elgin, Elk Grove Village, Evanston, Fort Sheridan, Fox Lake, Glenview, Half Day, Hampshire, Hanover Park, Harwood Heights, Huntley, Lake Bluff, Lake Forest, Lake Villa, Lake Zurich, Libertyville, Lincolnshire, Medinah, Morton Grove, Mount Prospect, Mundelein, North Chicago, Northbrook, Oak Brook, Zion and others. Area code 224 has 172 exchanges from 200 to 993.

Area Code 309

Area code 309 covers 25 counties with a population of around 906,658. The counties which fall under area code 309 are Bureau, Cass, Dewitt, Fulton, Hancock, Henderson, Henry, Knox, La Salle, Livingston, Logan, Marshall, Mason, McDonough, McLean, Mercer, Peoria, Putnam, Rock Island, Schuyler, Stark, Tazewell, Warren, Whiteside and Woodford.

There are 222 cities like Abingdon, Adair, Albany, Aledo, Alexis, Alpha, Altona, Anchor, Andalusia, Andover, Annawan, Roseville, Rushville, Seaton, Secor, Sheffield, Sherrard, Shirley, Stanford, Table Grove, Tennessee and others. Area code has 639 exchanges from 201 to 999.

Area Code 312

Area code 312 covers 8 counties with a population of around 2,926,848. The counties which fall under area code 312 are Champaign, Cook, Dupage, Kane, Lake, Marion, McHenry and Will. Area Code 312 covers 40 cities which include Algonquin, Arlington, Aurora, Barrington, Bensenville, Blue Island, Brookfield, Buffalo Grove, Champaign, Chicago and others. Area code 312 has 691 exchanges from 201 to 998.

Area Code 331

Area code 331 covers only 1 county which is Kane. It covers 10 cities Aurora, Downers Grove, Elmhurst, Geneva, Lombard, Naperville, Oswego, Roselle, Saint Charles and West Chicago. Area code 331 has 29 exchanges from 221 to 826.

Area Code 618

Area code 618 covers 42 counties with a population of around 1,222,158. The counties which fall under area code 618 are Alexander, Bond, Calhoun, Champaign, Clark, Clay, Clinton, Crawford, Edwards, Effingham, Fayette, Franklin, Gallatin, Greene, Hamilton, Hardin, Jackson, Jasper, Jefferson, Jersey, Johnson, Lawrence, Macoupin, Madison, Marion, Massac, Monroe, Perry, Pope, Pulaski, Randolph, Richland, Saint Clair, Saint Louis City, Saline, Shelby, Union, Wabash, Washington, Williamson and others. Area code 618 covers 326 cities and it has 675 exchanges from 201 to 998.

Area Code 630

Area code 630 covers 12 counties with a population of around 1,565,880. The counties which fall under the area code 630 are Champaign, Cook, Dekalb, Dupage, Kane, Kendall, La Salle, Lake, Livingston, McHenry, Tazewell and Will. It has 94 cities some of which are Addison, Arlington, Batavia, Bensenville, Berwyn, Big Rock, Bloomingdale, Buffalo Grove, Cary, Chicago, Cicero, Crystal Lake, Elgin, Elk Grove, Highland Park, Hanover Park, Hinsdale, Kaneville, Newark, Plano, Plainfield, River Grove, River Forest, Romeoville, Roselle, Wheaton, Westmont, Wheeling, Willowbrook, Winfield, Wood Dale, Yorkville and others. Area code 630 has 783 exchanges from 200 to 999.

Area Code 708

Area code 708 covers 8 counties with a population of around 1,745,585. The counties which fall under area code 708 are Cook, Dekalb, Dupage, Kane, Kankakee, Lake, McHenry and Will. Area code 708 covers 105 cities like Alsip, Batavia, Beecher, Bellwood, Berkeley, Berwyn, Frankfort, Franklin Park, Lockport, Lyons, Markham, Matteson, Maywood, Medinah, Melrose Park, Midlothian, Mokena, Monee, Mount Prospect and others. It has 671 exchanges.

Area Code 773

Area code 773 covers 4 counties with a population of around 3,088,426. The counties which fall under area code 773 are Cook, Dupage, Lake and Stephenson. There are 33 cities which fall under area code 773. It has 762 exchanges.

Area Code 779

Area code 779 covers 5 counties which are Boone, Bureau, Dekalb, Will and Winnebago. It also covers 11 cities and it has 22 exchanges.

Area Code 815

Area code 815 covers 30 counties with a population of around 1,538,523. The counties which are covered by area code 815 are Boone, Bureau, Carroll, Cook, Dekalb, Dupage, Ford, Grundy, Henry, Iroquois, Jo Daviess, Kane, Kendall, McLean, Ogle, Putnam, Stark and others. Area code 815 covers 266 cities and it has 783 exchanges.

Area Code 847

Area code 847 covers 7 counties which include Cook, Dekalb, Dupage, Kane, Kendall, Lake and McHenry with a population of around 1,864,331. It also covers 93 cities and it has 783 exchanges.