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There are some places in US, that contain "MO" in their names. For example, Columbia, MO; Kirkwood, MO; Saint Louis, MO. So, what does MO mean?

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Surprisingly noone asked the question of Why. :) – Karlson Jan 23 '13 at 14:45
A simple web search for any of those place names should find you an answer, within the top one results or so :). – choster Jan 23 '13 at 14:54
Cute question... – Heidel Ber Gensis Jan 23 '13 at 17:08
All places in the US end in a two-letter code for the state. It's just usually they are much more obviously related to the name of the state. Unfortunately, 8 states start with M and MI already got used for Michigan. – Loren Pechtel Jan 24 '13 at 20:45
up vote 28 down vote accepted

It's the two-letters code of the state.

MO is Missouri.

List of U.S. state abbreviations - Wikipedia

You can learn them with this geographical game of States of USA or text game of states abbreviations.

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Thank you a lot. – Daria Jan 23 '13 at 10:44

The state abbreviation (such as MO) is sometimes required because quite often there is more than one city with the same in the US. There is a "Portland" in Maine and one in Oregon, Kansas City, Missouri and Kansas City, Kansas (same city, but the state line runs across the city), and almost each state has it's own "Springfield".

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I must disagree with this reasoning; although it's true there are often multiple cities with the same name in the U.S., state names abbreviations are used almost without exception, even when there is only one. – Flimzy Nov 26 '13 at 15:05

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