State abbreviations are often required when entering a physical address for purposes such as sending packages, cards, or documents. Learning the Missouri state abbreviation is extremely useful and important for those residing or doing business in the state, or those that have friends, family, or business associates in Missouri.

Due to there being 50 states, all with their own unique two-letter abbreviation, it can become a hard task trying to remember each state’s abbreviation when you most need it, especially as many states share similar lettering in their names. This page has been created for the purpose of letting you know what the Missouri state abbreviation is.

MO State Abbreviation

The Missouri state abbreviation is made up of the first and fifth letters of the state’s name, which is MO. This might seem easy enough, but it’s not, as the natural assumption is that the Missouri state abbreviation is MI, its first two letters. Additionally, there are other states that are spelled very similarly to Missouri, and this creates confusion over the MO state abbreviation. Quite a few states use the first and second letters for their two-letter state abbreviation, and other states similar to Missouri are Mississippi, Michigan, and Minnesota. Can you guess what the Mississippi state abbreviation is?

MO State Abbreviation

There’s not just the two-letter postal abbreviation for all 50 states, there’s a longer 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 along with zip codes.




The Missouri state abbreviation is actually the same as the postal abbreviation, being made up of the first and fifth letters in the state’s name with a period at the end of the abbreviation, it reads, “MO.”.

The Show-Me State is becoming an increasingly popular place to do business and reside in and companies that base themselves in Missouri have several advantages from low operating costs to tax credits and easy availability of grants and loans for business expansion. Missouri is among the top states where financial sector employment growth is concerned. Knowing the MO state abbreviation will come in handy.

If you are interested in learning more about the Missouri state minimum wage, the current rate, prior MO min wage rates, and upcoming changes and increases in the Missouri minimum wage, take a look at our page dedicated to this.

Missouri Postal Abbreviation

People use state abbreviations all the time in everyday life and business. It is important to understand the unique two-letter abbreviation representing each state in the U.S. as the probability of you needing to memorize them is very high. Likewise, the Missouri postal abbreviation is an important one to remember since many people mix it up with the Mississippi state abbreviation.

Check out our US State Initials table where you can see not just the Missouri (MO) postal abbreviation, but each state’s unique two-letter postal abbreviations and regular abbreviations. Additionally, you can download a free, printable PDF of all US state initials.