The only people who have shown up at my apartment door are Jehovah Witness followers, and sales people from alternative gas and electric companies. Thankfully those have petered out. When they did show up, I never even opened the door to them, and simply said "Not interested," before they'd could start their spiel.
I don’t think door-to-door salesmen would do very well around here. Too far between houses, and most people aren’t very keen on uninvited visitors. Jehovah’s Witnesses can show up anywhere (got some once at a BLM station that was almost the only habitation on a 55-mile stretch of highway), but they haven’t come to my door yet.