State Abbreviation Guide

What Is the Abbreviation for Missouri?

The standard 2-letter abbreviation for Missouri is MO.

State Abbreviation
MO
Traditional Form
Mo.
Capital
Jefferson City
Region
Midwest

Missouri Abbreviation

MO is the standard abbreviation for Missouri. Mo. still appears in older print sources, but MO is the standard code used in addresses, forms, databases, and current style guides.

2-letter postal code
MO
Traditional / AP style
Mo.
Address format
Jefferson City, MO
Takes periods?
No — write MO, not MO.

Missouri Abbreviation for Mailing and Forms

Use MO for Missouri in mailing addresses, shipping labels, official forms, and database records.

Mailing addresses
Shipping labels
Online checkout forms
Tax documents
Spreadsheets & databases
Government & school records

In all of these contexts write MO in uppercase. The form MO. with a period is incorrect for postal use.

AP Style and Traditional Missouri Abbreviation

Postal & forms MO Mailing addresses, shipping labels, online forms, and all data entry.
AP Style & editorial Mo. Newspapers, news releases, and most editorial style guides when a city name comes first.

What Does MO Stand For?

Missouri's USPS abbreviation is MO.

MO became Missouri's standard postal abbreviation in 1963. The older form Mo. still appears in older writing, but MO is the form used in current addresses and forms.

How to Write a Missouri Address

In a U.S. mailing address, write the city name, then MO in uppercase, then the five-digit ZIP Code. Never put a period after the abbreviation.

John Smith 123 Main St Jefferson City, MO ZIP

The same format applies in checkout forms, school worksheets, CRM systems, spreadsheets, shipping labels, and government databases — anywhere a two-letter state code is required.

Related Abbreviation Questions

These states share a first letter, region, or alphabetical position with Missouri and are commonly looked up alongside it.

What is the abbreviation for Maine? Maine's abbreviation is ME. What is the abbreviation for Maryland? Maryland's abbreviation is MD. What is the abbreviation for Massachusetts? Massachusetts's abbreviation is MA. What is the abbreviation for Michigan? Michigan's abbreviation is MI. What is the abbreviation for Minnesota? Minnesota's abbreviation is MN. What is the abbreviation for Mississippi? Mississippi's abbreviation is MS.

FAQ

What is the abbreviation for Missouri?

The standard USPS abbreviation for Missouri is MO.

What is the postal abbreviation for Missouri?

MO is the two-letter postal abbreviation for Missouri. It is the form used in mailing addresses, shipping labels, forms, and databases.

How do you abbreviate Missouri?

Abbreviate Missouri as MO in current USPS, mailing, and database use.

What is the two-letter abbreviation for Missouri?

MO is the official two-letter abbreviation for Missouri.

What is the Missouri state code?

MO is the two-letter state code used for Missouri in mailing addresses, forms, spreadsheets, and databases.

Why is Missouri abbreviated MO?

Missouri's USPS abbreviation is MO.

What does MO stand for?

MO stands for Missouri in the USPS state abbreviation system.

What is the old abbreviation for Missouri?

Older editorial styles often wrote Missouri as Mo.. For mailing and database use, the modern standard is MO.

How do you write a Missouri mailing address?

Use the city name, then the two-letter postal code MO, then the ZIP Code. For example: Jefferson City, MO 00000.

What state is MO?

MO is the postal abbreviation for Missouri, located in the Midwest region. The capital is Jefferson City.