What Is the Abbreviation for Indiana?
The standard abbreviation for Indiana is IN. This page explains why Indiana uses IN, how the code fits into the modern USPS system, what older printed abbreviations looked like, and which nearby or similar state codes people commonly confuse with it.
What Is the Abbreviation for Indiana?
Indiana's abbreviation is IN. You may also see Ind. in older writing, but IN is the form used in mailing addresses, forms, databases, and current style guides.
Use IN for Indiana in mailing addresses, shipping labels, official forms, and database entries.
Why Indiana Uses IN
Indiana's USPS abbreviation is IN.
IN became the standard postal abbreviation for Indiana in 1963. The older form Ind. still appears in older writing, but IN is the form used in current addresses and forms.
Old Abbreviation for Indiana
Before the USPS two-letter system became the mailing standard in 1963, printed reference books and newspapers often used longer abbreviations with punctuation. For Indiana, that older style was usually Ind..
That older form still appears in historical texts, archival material, and some legacy style guides, but the modern postal and database standard is IN. If someone searches for old abbreviation for Indiana, the practical answer is to recognize Ind. and use IN in current writing and addresses.
How to Write Indiana in an Address
In standard American addressing, the state line uses the city name followed by the two-letter code and ZIP Code. The abbreviation stays uppercase and does not take periods.
That same format applies in checkout forms, school worksheets, CRM exports, spreadsheets, shipping labels, and government databases — anywhere a two-letter state code is required.
IN Compared With Similar State Codes
IN is simple in an address, but outside that context it can blend into ordinary English, so many people search for the full state name.
Related Abbreviation Questions
These states share a first letter, region, or alphabetical position with Indiana and are commonly checked alongside it.
Capital, Region, and Context
Indiana belongs to the Midwest region. Its capital is Indianapolis, and its postal code IN is used in addresses, forms, and databases throughout the country.
Indiana entered the Union on December 11, 1816.
FAQ
What is the abbreviation for Indiana?
The standard USPS abbreviation for Indiana is IN.
What is the postal abbreviation for Indiana?
IN is the two-letter postal abbreviation for Indiana. It is the form used in mailing addresses, shipping labels, forms, and databases.
How do you abbreviate Indiana?
Abbreviate Indiana as IN in current USPS, mailing, and database use.
Why is Indiana abbreviated IN?
Indiana's USPS abbreviation is IN.
What does IN stand for?
IN stands for Indiana in the USPS state abbreviation system.
What is the old abbreviation for Indiana?
Older editorial styles often wrote Indiana as Ind.. For mailing and database use, the modern standard is IN.
How do you write a Indiana mailing address?
Use the city name, then the two-letter postal code IN, then the ZIP Code. For example: Indianapolis, IN 00000.
What state is IN?
IN is the postal abbreviation for Indiana, located in the Midwest region. The capital is Indianapolis.
Test All 50 State Abbreviations
Now that you know IN stands for Indiana, see how many of the other 49 you can get right. The M-states and I-states trip up most people.