What is the tax code that I should use for Form 1099 DIV GA or XX as JP Morgan doesn't know?

[SteamTrain]

Generally, that should be an XX  (which means "More than one state")

....the tax-exempt dividends in a Bond Fund come form a mixture of many states (unless you own a state specific Bond fund ).  

IF you ever find a state breakdown, you can single out the specific amount from GA-issued bonds (and any US Territories)...but you have to calculate that amount yourself.....but "More than one state " is always acceptable.

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IF you ever do  a GA breakout, the breakout in the interview will look like the one below (example for an NC resident)