Okay, I seemed to be done with the census critters, but I guess I wasn't. A different census critter showed up at my door moments ago.
Here's how it went:
census critter: Hi...I'm here for the census....
me: Somebody already came.
census critter: Well...that person didn't get the number of people in the house.
me: I know.
census critter: Can I get that number?
me: (smiling) No. (closing door)
I was actually prepared to provide the number to the first guy, but he turned around and left without bargaining for it. I resolved from the start I'd initially be nice, and if they push it, I will not. I regard bothering me multiple times (like, four in the mail and two in person) as pushing it.
The next time, it will be "You're trespassing on private property. Please leave." I guess I'll be charging the camcorder battery and chasing them off the property with it, if there's a next time.