Illinois is part of the United States of America, which uses telephone country code +1.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
This is probably a North American number, as 00 is a common international access code, and 1 is the country code for North America. Area code 773 is Chicago, Illinois, USA.
Illinois, USA, including the cities of Belleville and East St. Louis, among others.
60450 is the zip code for Morris, Illinois.
Bourbonnais, Illinois, is in area code 815 and overlay code 779.
In North America (country code +1; USA, Canada, etc.), there is no area code 961. Area code 217 is in Illinois, including Champaign and Springfield. International country code +961 (dialed from the US as 011-961) is Lebanon, in the Middle East. The cost to call from Illinois to Lebanon depends on which long-distance company you use and what calling plan you subscribe to.
The zip code for Mattoon, Illinois is 61938.
The airport code for Southern Illinois Airport is MDH.
60416 Zip Code (Coal City, Illinois)
00 is not part of the country code, it is a commonly used international access prefix. Country code +1 is North America (USA, Canada, etc.), and area code +1 847 serves the suburbs just north of Chicago, Illinois. However, there should be exactly 7 digits after the area code, so the number shown is not valid.
The airport code for Illinois Valley Regional Airport is VYS.
The airport code for University of Illinois Willard Airport is CMI.
The airport code for Central Illinois Regional Airport is BMI.