Question: What is the 1099 filing address for Louisiana?   Answer: Sign, date and mail your Form L-3 (Louisiana Transmittal of Withholding Tax Statements) along with your 1099 statements to:   Louisiana Department of Revenue P.O. Box 91017 Baton Rouge, LA 70821-9017   For more information refer to http://1099-efile.realtaxtools.com/state/