A little clicking such as clicking on the button that says Database at the top and then clicking on the state of New York would get you the following list with all the counties in new york
Here are 2 websites that might be of help to you. I find them to be very helpful in finding out frequencies.
1. www.nf2g.com/scannist/index.html
click on frequencies on the left hand side of this webpage and then click on the county in which you want frequencies for.