After 2 calls and no messages, I called the number back. Gentleman stated he was from the U.S. Census Beureau and that he didn't have my information in front of him but that I should be receiving a call later this evening from someone who would like to find out the quality of the door to door census reps. Sounded like he was in a call center. Heard a lot of talking & background noise. Not sure if it was legit, but if they call back I'll answer the call and see what it's all about.