The IRS automatically does it based on Zip Code.

The IRS automatically identifies taxpayers located in the covered disaster area and applies filing and payment relief. But affected taxpayers who reside or have a business located outside the covered disaster area should call the IRS disaster hotline at 866-562-5227 to request this tax relief.

https://www.irs.gov/newsroom/irs-announces-tax-relief-for-victims-of-wildfires-in-california