Webjul 9, 2021 · the taxpayer advocate service (tas) merges utah offices into one central location in ogden, ut, closing the salt lake city site effective june 20, 2021. Webinternal revenue service (irs) is located at 1160 w 1200 s st in ogden, utah 84201. Make sure to include the “mail stop” number for faster service. You can fax the notice to the irs. That’s right, the irs accepts fax.