Missouri is the only state with the postal abbreviation MO.
Missouri
You can use US or USA to mean the United States.
NM
VA is the the US Postal Service approved abbreviation for Virginia.VA is the Abbreviation for Virginia
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The most accepted abbreviation is WI (which are both written as capital letters). This practice is accepted by the US Postal System for all US states and Territories.WI
The standard two letter abbreviation for the state of North Dakota is ND.
MS is the state of Mississippi.
Standard Abbreviation: Ill.Postal Abbreviation: IL
NC is standard abbreviation approved by the US Postal Service for North Carolina.The abbreviation for North Carolina is NC. In most cases, the abbreviation for most states will be formed using initials of their names.