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All state abbreviations

What state is IL?

IL = Illinois

IL is the official two-letter USPS postal abbreviation for Illinois. The capital is Springfield, and Illinois is in the Midwest region. See the full Illinois profile for borders, nickname, symbols, and map practice.

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Quick facts

Abbreviation
IL
Capital
Springfield
Region
Midwest
Nickname
The Prairie State

Easy to confuse with

IA = Iowa
Not IL
ID = Idaho
Not IL
IN = Indiana
Not IL

FAQ

What state is IL?

IL is Illinois.

Is IL Illinois?

Yes. IL is the USPS postal abbreviation for Illinois.

What is the capital of Illinois?

The capital of Illinois is Springfield.

Which states are easy to confuse with IL?

Watch for codes like IA, ID, IN when you see IL.