After an overwhelming response from our readers, thousands of letters are now winging their way across the Atlantic ocean to Ohio. And so, Operation Clark County has come to an end.
If you have received an address and intend to write your letter; please remember to be courteous and sensitive in what you say.
We will publish a selection of the best letters in the Guardian on Thursday October 21.
Thank you all for your contributions and the responses you have emailed to us. You can continue to keep up with the progress of the election by visiting our US elections Special Report.