The muni market is doing great, at least on paper that is. Muni bonds have seen an absolutely furious rally over the last few months, which has driven yields to the lowest level since the 1950s. However, many municipalities have huge budget deficits, so the trick is to buy prudently. Eaton Vance published a piece with a state by state analysis of financial health, since the pain of tax revenue losses is not spread evenly. There are multiple ways to look at the info. The states who will see a 20%+ fall in revenue include: Idaho, Wyoming, North Dakota, Oklahoma, Missouri, New York, Alaska, Maine, West Virginia, Louisiana, and New Jersey. The top ten states for creditworthiness (meaning the most creditworthy) according to Eaton Vance are Idaho, Wyoming, South Dakota, Utah, Nebraska, North Dakota, Tennessee, Iowa, Virginia, and Minnesota.
FINSUM: New York and New Jersey are the most alarming ones on this list, since they are seeing big revenue falls and were already in quite poor financial condition. Illinois is obviously troubling too, as it is dead last in creditworthiness and likely to see a 13%+ fall in revenue.