The telephone country code for the United States is +1. The area codes for Illinois are: 217 = Springfield, Champaign;
224 = (overlay of 847);
309 = Bloomington, Peoria, Quad Cities;
312 = downtown Chicago;
331 = (overlay of 630);
447 = (planned overlay of 217);
618 = East St. Louis, Collinsville;
630 = Aurora, Hinsdale;
708 = Cicero;
730 = (planned overlay of 618);
773 = Chicago (outside downtown);
779 = (overlay of 815);
815 = Rockford, Joliet;
847 = Roselle, Northbrook, Elk Grove Village;
872 = (overlay of both 312 and 773).
Peoria, Illinois, is in area code +1 309.
There is more than one area code. See link for Illinois area codes.
In the United States, the states with the most area codes are:California (30 area codes, will be 31 as of 2012-11-20)Texas (24 area codes)Florida (17 area codes)New York (15 area codes)Illinois (13 area codes, with three more planned for 2013)When area codes were first introduced in 1947, California had 3, Texas had 4, Florida had only 1, New York had 5, and Illinois had 4.
There are three zip codes for Urbana, Illinois. They are 61801, 61802, and 61803.
If you look at maps, you will not find area codes. Area codes can be found on area code locator websites. Another place to find area codes is in the telephone directory.
The area of Illinois Caverns State Natural Area is 485,622.770688 square meters.
Illinois.
The area of Canton Lake - Illinois - is 1,015,760.9620224 square meters.
The area of Baldwin Lake - Illinois - is 8,166,556.2604032 square meters.
The area of Cedar Lake - Illinois - is 7,081,998.739200001 square meters.
The area of Otter Lake - Illinois - is 3,095,845.1631360003 square meters.
The area of Clinton Lake - Illinois - is 19.83 square kilometers.
The area of Lake Galena - Illinois - is 890,308.4129280001 square meters.