Founded in 1831, Cook County is one of 102 counties in the state of Illinois. Historically, Cook County was formed from Putnam County. The city of Chicago is the county seat. With FIPS code of 31, Cook County has a population of 5,173,146 and area of 944 square miles (2,445 km2).
List of all cities in Cook County, IL alphabetically
| City/Town | Postal Code | Area Code |
| Alsip, IL | 60803 | 708/464 |
| American National Bank, IL | 60678 | 312/872 |
| Amf Ohare, IL | 60666 | 773 |
| Argo, IL | 60501 | 708/464 |
| Arlington Heights, IL | 60004 | 847/224 |
| 60005 | 847/224 | |
| 60006 | 847/224 | |
| Ashburn Park, IL | 60652 | 773 |
| Bank of America, IL | 60674 | 312/872 |
| 60682 | 312/872 | |
| 60693 | 312/872 | |
| 60696 | 312/872 | |
| 60697 | 312/872 | |
| Bartlett, IL | 60133 | 630/331 |
| Bedford Park, IL | 60455 | 708/464 |
| 60458 | 708/464 | |
| 60459 | 708/464 | |
| 60499 | 708/464 | |
| 60501 | 708/464 | |
| 60629 | 773 | |
| 60638 | 773 | |
| Bellwood, IL | 60104 | 708/464 |
| Berkeley, IL | 60163 | 708/464 |
| Berwyn, IL | 60402 | 708/464 |
| Blue Island, IL | 60406 | 708/464 |
| Bolingbrook, IL | 60439 | 630/331 |
| Bridgeview, IL | 60455 | 708/464 |
| Broadview, IL | 60153 | 708/464 |
| 60155 | 708/464 | |
| Brookfield, IL | 60513 | 708/464 |
| Burbank, IL | 60459 | 708/464 |
| Burnham, IL | 60633 | 773 |
| Calumet City, IL | 60409 | 708/464 |
| Calumet Park, IL | 60643 | 773 |
| 60827 | 708/464 | |
| Charles A Hayes, IL | 60649 | 773 |
| Chase Bank, IL | 60670 | 312/872 |
| 60673 | 312/872 | |
| Chestnut Street, IL | 60610 | 312/872 |
| Chicago, IL | 60290 | 312/872 |
| 60601 | 312/872 | |
| 60602 | 312/872 | |
| 60603 | 312/872 | |
| 60604 | 312/872 | |
| 60605 | 312/872 | |
| 60606 | 312/872 | |
| 60607 | 312/872 | |
| 60608 | 312/872 | |
| 60609 | 773 | |
| 60610 | 312/872 | |
| 60611 | 312/872 | |
| 60612 | 312/872 | |
| 60613 | 312/872 | |
| 60614 | 773 | |
| 60615 | 312/872 | |
| 60616 | 312/872 | |
| 60617 | 773 | |
| 60618 | 773 | |
| 60619 | 773 | |
| 60620 | 773 | |
| 60621 | 773 | |
| 60622 | 773 | |
| 60623 | 773 | |
| 60624 | 773 | |
| 60625 | 773 | |
| 60626 | 773 | |
| 60628 | 773 | |
| 60629 | 773 | |
| 60630 | 773 | |
| 60631 | 773 | |
| 60632 | 773 | |
| 60633 | 773 | |
| 60634 | 773 | |
| 60636 | 773 | |
| 60637 | 773 | |
| 60638 | 773 | |
| 60639 | 773 | |
| 60640 | 773 | |
| 60641 | 773 | |
| 60642 | 773 | |
| 60643 | 773 | |
| 60644 | 773 | |
| 60645 | 773 | |
| 60646 | 773 | |
| 60647 | 773 | |
| 60649 | 773 | |
| 60651 | 773 | |
| 60652 | 773 | |
| 60653 | 773 | |
| 60654 | 312/872 | |
| 60655 | 773 | |
| 60656 | 773 | |
| 60657 | 773 | |
| 60659 | 773 | |
| 60660 | 773 | |
| 60661 | 312/872 | |
| 60664 | 312/872 | |
| 60666 | 773 | |
| 60668 | 312/872 | |
| 60669 | 312/872 | |
| 60670 | 312/872 | |
| 60673 | 312/872 | |
| 60674 | 312/872 | |
| 60675 | 312/872 | |
| 60677 | 312/872 | |
| 60678 | 312/872 | |
| 60680 | 312/872 | |
| 60681 | 312/872 | |
| 60682 | 312/872 | |
| 60684 | 312/872 | |
| 60685 | 312/872 | |
| 60686 | 312/872 | |
| 60687 | 312/872 | |
| 60688 | 312/872 | |
| 60689 | 312/872 | |
| 60690 | 312/872 | |
| 60691 | 312/872 | |
| 60693 | 312/872 | |
| 60694 | 312/872 | |
| 60695 | 312/872 | |
| 60696 | 312/872 | |
| 60697 | 312/872 | |
| 60699 | 312/872 | |
| 60701 | 773 | |
| 60706 | 773 | |
| 60707 | 708/464 | |
| 60712 | 773 | |
| 60803 | 708/464 | |
| 60804 | 708/464 | |
| 60805 | 708/464 | |
| 60827 | 708/464 | |
| Chicago Heights, IL | 60411 | 708/464 |
| 60412 | 708/464 | |
| Chicago Lawn, IL | 60629 | 773 |
| Chicago Ridge, IL | 60415 | 708/464 |
| Cicero, IL | 60804 | 708/464 |
| Clearing, IL | 60638 | 773 |
| CNA Center, IL | 60685 | 312/872 |
| Cntry Clb Hls, IL | 60478 | 708/464 |
| Commonwealth Edison, IL | 60668 | 312/872 |
| Country Club Hills, IL | 60478 | 708/464 |
| Countryside, IL | 60525 | 708/464 |
| Cragin, IL | 60639 | 773 |
| Crestwood, IL | 60445 | 708/464 |
| Ctry Clb Hls, IL | 60478 | 708/464 |
| Daniel J Doffyn, IL | 60618 | 773 |
| Des Plaines, IL | 60016 | 847/224 |
| 60017 | 847/224 | |
| 60018 | 847/224 | |
| 60019 | 847/224 | |
| Despl/Rsmt Bus Rply, IL | 60019 | 847/224 |
| Div of Postal Inspectors, IL | 60669 | 312/872 |
| Dixmoor, IL | 60406 | 708/464 |
| 60426 | 708/464 | |
| Dolton, IL | 60419 | 708/464 |
| East Hazel Crest, IL | 60429 | 708/464 |
| Elk Grove Village, IL | 60007 | 847/224 |
| 60009 | 847/224 | |
| Elmwood Park, IL | 60707 | 708/464 |
| Elsdon, IL | 60632 | 773 |
| Englewood, IL | 60621 | 773 |
| Evanston, IL | 60201 | 847/224 |
| 60202 | 847/224 | |
| 60203 | 847/224 | |
| 60204 | 847/224 | |
| 60208 | 847/224 | |
| 60209 | 847/224 | |
| Evergreen Park, IL | 60805 | 708/464 |
| Fifth Third Bank, IL | 60689 | 312/872 |
| Fleet, IL | 60696 | 312/872 |
| Flossmoor, IL | 60422 | 708/464 |
| Ford Heights, IL | 60411 | 708/464 |
| Forest Park, IL | 60130 | 708/464 |
| Forest View, IL | 60402 | 708/464 |
| 60638 | 773 | |
| Fort Dearborn, IL | 60610 | 312/872 |
| 60611 | 312/872 | |
| Franklin Park, IL | 60131 | 847/224 |
| Glencoe, IL | 60022 | 847/224 |
| Glenview, IL | 60025 | 847/224 |
| 60026 | 847/224 | |
| Glenwood, IL | 60425 | 708/464 |
| Golf, IL | 60029 | 847/224 |
| Graceland, IL | 60657 | 773 |
| Grand Crossing, IL | 60619 | 773 |
| Hanover Park, IL | 60133 | 630/331 |
| Harris Bank, IL | 60694 | 312/872 |
| Harvey, IL | 60426 | 708/464 |
| 60428 | 708/464 | |
| Harwood Heights, IL | 60656 | 773 |
| 60706 | 773 | |
| Hazel Crest, IL | 60429 | 708/464 |
| Hegewisch, IL | 60633 | 773 |
| Henry Mcgee, IL | 60615 | 312/872 |
| 60653 | 773 | |
| Hickory Hills, IL | 60457 | 708/464 |
| Hillside, IL | 60162 | 708/464 |
| 60163 | 708/464 | |
| Hines, IL | 60141 | 708/464 |
| Hodgkins, IL | 60525 | 708/464 |
| Hoffman Estates, IL | 60067 | 847/224 |
| 60169 | 847 | |
| 60173 | 847/224 | |
| 60179 | 847/224 | |
| 60192 | 847/224 | |
| 60195 | 847/224 | |
| 60196 | 847/224 | |
| Hometown, IL | 60456 | 708/464 |
| Homewood, IL | 60422 | 708/464 |
| 60430 | 708/464 | |
| Hubbard Woods, IL | 60093 | 847/224 |
| Ind Head Park, IL | 60525 | 708/464 |
| Indian Head Park, IL | 60525 | 708/464 |
| Indianhead Park, IL | 60525 | 708/464 |
| Inverness, IL | 60067 | 847/224 |
| Jackson Park, IL | 60637 | 773 |
| Jefferson, IL | 60630 | 773 |
| Jefferson Park, IL | 60630 | 773 |
| John Buchanan, IL | 60617 | 773 |
| Jp Morgan Chase, IL | 60670 | 312/872 |
| 60673 | 312/872 | |
| 60695 | 312/872 | |
| Jt Weeker Isc, IL | 60290 | 312/872 |
| 60688 | 312/872 | |
| Justice, IL | 60458 | 708/464 |
| Kenilworth, IL | 60043 | 847/224 |
| Kildeer, IL | 60074 | 847/224 |
| La Grange, IL | 60525 | 708/464 |
| La Grange Highlands, IL | 60525 | 708/464 |
| La Grange Park, IL | 60526 | 708/464 |
| Lakeview, IL | 60613 | 312/872 |
| Lansing, IL | 60438 | 708/464 |
| Lemont, IL | 60439 | 630/331 |
| Lincoln Park, IL | 60614 | 773 |
| Lincolnwood, IL | 60645 | 773 |
| 60646 | 773 | |
| 60659 | 773 | |
| 60712 | 773 | |
| Lynwood, IL | 60411 | 708/464 |
| Lyons, IL | 60534 | 708/464 |
| Markham, IL | 60426 | 708/464 |
| 60428 | 708/464 | |
| Mary Alice Henry, IL | 60624 | 773 |
| Matteson, IL | 60443 | 708/464 |
| Maywood, IL | 60153 | 708/464 |
| 60155 | 708/464 | |
| McCook, IL | 60525 | 708/464 |
| Mellon Financial Services, IL | 60055 | 847/224 |
| Melrose Park, IL | 60160 | 708/464 |
| 60161 | 708/464 | |
| 60163 | 708/464 | |
| 60164 | 708/464 | |
| 60165 | 708/464 | |
| Merchandise Mart, IL | 60654 | 312/872 |
| Merrionette Park, IL | 60655 | 773 |
| 60803 | 708/464 | |
| Midlothian, IL | 60445 | 708/464 |
| Morgan Park, IL | 60643 | 773 |
| Morton Grove, IL | 60053 | 847/224 |
| Mount Greenwood, IL | 60655 | 773 |
| Mount Prospect, IL | 60056 | 847/224 |
| Multi High Volume Firms, IL | 60196 | 847/224 |
| Nancy B Jefferson, IL | 60612 | 312/872 |
| National City Bank, IL | 60686 | 312/872 |
| Niles, IL | 60714 | 847/224 |
| Norridge, IL | 60634 | 773 |
| 60656 | 773 | |
| 60706 | 773 | |
| North Riverside, IL | 60546 | 708/464 |
| North Town, IL | 60645 | 773 |
| Northbrook, IL | 60062 | 847/224 |
| 60065 | 847/224 | |
| Northern Trust Co, IL | 60675 | 312/872 |
| Northfield, IL | 60093 | 847/224 |
| Northlake, IL | 60164 | 708/464 |
| Northtown, IL | 60659 | 773 |
| Northwestern University Adminstrn, IL | 60208 | 847/224 |
| Northwestern University Residental, IL | 60209 | 847/224 |
| Norwood Park, IL | 60631 | 773 |
| Oak Forest, IL | 60452 | 708/464 |
| Oak Lawn, IL | 60453 | 708/464 |
| 60454 | 708/464 | |
| 60455 | 708/464 | |
| 60456 | 708/464 | |
| 60457 | 708/464 | |
| 60458 | 708/464 | |
| 60459 | 708/464 | |
| Oak Park, IL | 60301 | 708/464 |
| 60302 | 708/464 | |
| 60303 | 708/464 | |
| 60304 | 708/464 | |
| Ogden Park, IL | 60636 | 773 |
| Olympia Fields, IL | 60461 | 708/464 |
| Ontario Street, IL | 60611 | 312/872 |
| Orland Hills, IL | 60477 | 708/464 |
| 60487 | 708 | |
| Orland Park, IL | 60462 | 708/464 |
| 60467 | 708/464 | |
| Otis Grant Collins, IL | 60623 | 773 |
| Otto Mall, IL | 60411 | 708/464 |
| Palatine, IL | 60038 | 847/224 |
| 60055 | 847/224 | |
| 60067 | 847/224 | |
| 60074 | 847/224 | |
| 60078 | 847/224 | |
| 60094 | 847/224 | |
| 60095 | 847/224 | |
| Palos Heights, IL | 60463 | 708/464 |
| Palos Hills, IL | 60465 | 708/464 |
| Palos Park, IL | 60464 | 708/464 |
| Park Forest, IL | 60466 | 708/464 |
| Park Ridge, IL | 60068 | 847/224 |
| Peoples Gas and Light, IL | 60687 | 312/872 |
| Phoenix, IL | 60426 | 708/464 |
| Pilsen, IL | 60608 | 312/872 |
| Pnc Bank, IL | 60677 | 312/872 |
| Posen, IL | 60469 | 708/464 |
| Prospect Heights, IL | 60070 | 847/224 |
| Ravenswood, IL | 60625 | 773 |
| Rev.Milton R.Brunson Station, IL | 60644 | 773 |
| Richton Park, IL | 60471 | 708/464 |
| River Forest, IL | 60305 | 708/464 |
| River Grove, IL | 60171 | 708/464 |
| Riverdale, IL | 60827 | 708/464 |
| Riverside, IL | 60546 | 708/464 |
| Robbins, IL | 60472 | 708/464 |
| Robert Leflore Jr., IL | 60651 | 773 |
| Roberto Clemente, IL | 60647 | 773 |
| Roger P. Mc Auliffe, IL | 60634 | 773 |
| Rogers Park, IL | 60626 | 773 |
| 60660 | 773 | |
| Rolling Meadows, IL | 60008 | 847/224 |
| Roseland, IL | 60628 | 773 |
| Rosemont, IL | 60018 | 847/224 |
| 60019 | 847/224 | |
| Sauk Village, IL | 60411 | 708/464 |
| Schaumburg, IL | 60159 | 847/224 |
| 60168 | 847/224 | |
| 60173 | 847/224 | |
| 60179 | 847/224 | |
| 60193 | 847/224 | |
| 60194 | 847/224 | |
| 60195 | 847/224 | |
| 60196 | 847/224 | |
| 60131 | 847/224 | |
| 60176 | 847/224 | |
| Sears Roebuck and Company, IL | 60179 | 847/224 |
| Sears Tower, IL | 60684 | 312/872 |
| Skokie, IL | 60076 | 847/224 |
| 60077 | 847/224 | |
| South Chicago Heights, IL | 60411 | 708/464 |
| South Holland, IL | 60473 | 708/464 |
| South Suburban, IL | 60499 | 708/464 |
| State of Il, IL | 60664 | 312/872 |
| Steger, IL | 60475 | 708/464 |
| Stickney, IL | 60402 | 708/464 |
| 60638 | 773 | |
| Stock Yards, IL | 60609 | 773 |
| Stone Park, IL | 60165 | 708/464 |
| Streamwood, IL | 60107 | 630/331 |
| Summit, IL | 60501 | 708/464 |
| Summit Argo, IL | 60501 | 708/464 |
| Techny, IL | 60082 | 847/224 |
| Thornton, IL | 60476 | 708/464 |
| Tinley Park, IL | 60477 | 708/464 |
| 60478 | 708/464 | |
| 60487 | 708 | |
| Twenty Second Street, IL | 60616 | 312/872 |
| University Park, IL | 60466 | 708/464 |
| USPS District Chicago, IL | 60699 | 312/872 |
| Westchester, IL | 60154 | 708/464 |
| Western Springs, IL | 60558 | 708/464 |
| Wheeling, IL | 60090 | 847/224 |
| Wicker Park, IL | 60622 | 773 |
| 60642 | 773 | |
| Willow Springs, IL | 60480 | 708/464 |
| Wilmette, IL | 60091 | 847/224 |
| Winnetka, IL | 60093 | 847/224 |
| Worth, IL | 60482 | 708/464 |
| Ww Grainger Inc, IL | 60038 | 847/224 |