irs phone number for wyoming
IRS Toll Free Phone Number in Casper, Wyoming: 1-800-829-4933 for Businesses. IRS Toll Free Helpline Number in Casper, Wyoming: 1-877-829-5500 for Exempt Organizations, Retirement Plan Administrators, and Government Entities. IRS TDD Toll Free Helpline Number in Casper, Wyoming: 1-800-829-4059 for people with hearing impairments.