Here are a few things I do to protect my privacy.
- Get a PO Box from the USPS, and use that address for my contact info anytime I have to give an address but don't need anything delivered. E.g., nonprofits, government agencies, insurance companies, etc.
- Set up a second gmail account to be used exclusively by companies, e.g., amazon, netflix, random ecommerce sites, government agencies, etc. I only give out my "real" email address to friends and family.
- Set up a Google Voice number that does not ring my phone, but which instead has messages transcribed and emailed to my 2nd email address.