Opt Out Phone & Junk Mail

Do Not Call Registry:
Free to sign up to opt out of certain types of marketing phone calls, and report violations. Administered by the Federal Communication Commission.

DMAchoice.org: Opt out of most mailing lists, including catalogs, donation requests, etc. This service does require you to create an account and pay a nominal fee ($2 as of 2021). See their website for details. You have the option of registering online, or by mail (mail requires an additonal processing fee).