Question: What is the 1099 filing address for Missouri?   Answer: Sign, date and mail your MO W-3 (Missouri Department of Revenue Transmittal of Tax Statements) along with your 1099 returns to:   Missouri Department of Revenue P.O. Box 3330 Jefferson City,Missouri 65105?3330   For more information refer to http://1099-efile.realtaxtools.com/state/Missouri/