Most newspapers limit your letter to 250 words. It is not worth writing longer letters unless you contact the editors of a particular publication for a "point of view" editorial. Be prepared for lots of obstacles in getting a this type of editorial published.
Don't send your letters to multiple newspapers in the same e-mail. Be sure to include you phone number for verification (won't be printed). Here are the links to send your letters to the editor; go for it...
Hudson Valley News (Southern Dutchess to Rhinebeck)
Hudson Valley Press (used to be the Black Press)
Mid Hudson News
Northern Dutchess News
Observer (Red Hook/Rhinebeck)
Post Pioneer (New Paltz)
Register Star (Red Hook/Hudson)
Southern Dutchess News
Times Herald Record (Middletown)
Click on: http://services.hudsonvalley.com/reader-services/submissions/letter-to-editor/.
Write or paste your letter (250 words or less).
Ulster County Press