State abbreviations are usually required when using a physical address for purposes such as sending packages, cards, business documents, creating marketing materials, or filling in forms. Knowing the Illinois state abbreviation is important for those that either live in Illinois, are thinking of moving there, are searching for information in Illinois, or simply mailing something to someone in the state.

IL State Abbreviation

The 50 different states in the U.S. all have their own unique two-letter postal abbreviations and it can be hard to remember each state’s abbreviation when you might need it most, especially as most states share similar lettering in their names. This page has been created to provide specific details on the Illinois State Abbreviation.

The Illinois state abbreviation, like most other states’ abbreviations, is made up of the first two letters of the name, an easy one to remember – “IL”. There will probably be situations in the future where knowing the Illinois state abbreviation will be beneficial.

IL State Abbreviation

There isn’t just a two-letter postal abbreviation for all 50 states, there is also an abbreviation for each state. Regular state abbreviations came out in 1963, however, many were three or four letters in length and it was decided they would be too long to include on envelopes and packages as addressing equipment couldn’t accommodate these longer state abbreviations in addition to zip codes.




The IL state abbreviation is made up of the first three letters in the name with a period at the end, ‘”Ill.” The Prairie State is becoming increasingly popular with businesses, tourists, international trade, and those looking to relocate from another state or country. Knowing the IL state abbreviation will be helpful to you.

People use state abbreviations all the time in everyday life and in business, it is important to understand the unique two-letter postal abbreviation representing each state in the U.S. as the probability of you needing to memorize it is very high.

Check out our US State Initials table where you can see each state’s unique two-letter postal abbreviations and regular abbreviations, including Illinois – IL.

If you are an employer or employee in the state of Illinois, or if you are interested in starting a business in IL, you may be interested to learn more about the Illinois state minimum wage. The page covers the current Illinois minimum wage rate, future increases, updates, and a table of the IL minimum wage history so you can see its rate of growth over the past several years.