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All state abbreviations

What state is ID?

ID = Idaho

ID is the official two-letter USPS postal abbreviation for Idaho. The capital is Boise, and Idaho is in the West region. See the full Idaho profile for borders, nickname, symbols, and map practice.

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Quick facts

Abbreviation
ID
Capital
Boise
Region
West
Nickname
The Gem State

Easy to confuse with

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

FAQ

What state is ID?

ID is Idaho.

Is ID Idaho?

Yes. ID is the USPS postal abbreviation for Idaho.

What is the capital of Idaho?

The capital of Idaho is Boise.

Which states are easy to confuse with ID?

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