I have a mutual fund (Vanguard) of long term tax exempt bonds. This reports tax-exempt income. But I have no idea which states the bonds are from. Do I need this detail?

[Bsch4477]

Tell the program that the income is from multiple states. It is likely that the income is taxable by your state but laws vary. 

[Mike9241]

Most (if not all states) consider interest and other investment/ unearned income to be allocable to your resident state. However, there could be an exception if the interest is related to a business you have an interest in which operates in a nonresident state.