Boston is a city, and does not really have an abbreviation. However, for it could possibly be written as "Bos" if an abbreviation is needed.
IN is the abbreviation for the state of Indiana.
BST
None. But it is the abbreviation of Alberta, a Canadian province.
It is not a state abbreviation in the US.
The abbreviation for the state of Missouri is MO.
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The state with the abbreviation KY is Kentucky.
The abbreviation for the state of Pennsylvania is PA.
The abbreviation for the state of Alabama is AL.
IL is the state abbreviation for Illinois.
MS is the abbreviation for the state of Mississippi.