But both Alabama and Montana allow a deduction for federal income tax, right?  I haven't done either of those returns recently, so I don't know if they do like Oregon and allow the final tax amount on the federal return to be used for the same year's state deduction.  And Pennsylvania has all those local taxes for cities and school districts and mosquito abatement districts.  Or maybe I'm thinking of Ohio.  Seen one Rust Belt state, seen them all.  

And your list needs to be updated.  Aren't you keeping up with the count, on questions here about Maryland?