The Monitoring Times annual Airshow Guide which is available for download at
MT HOME
contains an article on which radios cover the necessary frequencies and modes to listen to airshows. Note that it is not only a question of frequency coverage, but also the need to cover some of those frequencies in the AM mode. The guide is also a good reference for frequencies used by the various show participants.
There is also an excellent article in the wiki at
Milcom Receiving Equipment - The RadioReference Wiki
As far as police, it appears from the database that there's still considerable analog in your county. However, the State of Ohio MARCS system is all digitial and some of the agencies from your county are on that system. You might want to check in the Ohio forum to find out if there are other agencies that have announced plans to join the MARCS system. You'll need a digital scanner to listen to MARCS and that will up the cost considerably.
Dick