Use this contact information page to find addresses in Nevada for: Internal Revenue Service Nevada Department of Taxation Office of the Nevada State Controller 555 E. Carson St., Suite 905 Las Vegas, NV 89 Internal Revenue Service Nevada State Tax Commission P.O. Box 2221 Las Vegas, NV 89 The IRS website provides an online service for filing a Form W-9, Request for Taxpayer Identification Number (TIN). The service allows for taxpayers to file their federal individual income tax returns and claim deductions with the Department of the Treasury's online tax software.