Remember the census takers are not coming to your home until after May 1 until July. If you do not fill out the 2010 Census form sent to you, or do not answer all the questions they will be visiting you in person. The form sent should include a postage paid return envelope.
If they are on your door step now, it is a probable scam.

This information directly from the government web site: http://2010.census.gov/2010census/index.php

Do I have to talk to the census taker?

Yes. Your participation in the 2010 Census is vital and required by law, (Section 221, of Title 13 of the U.S. Code). However, rather than rely on criminal charges, the Census Bureau is very successful in getting participation by explaining the importance of the questions we ask and how the information benefits our communities.

Your privacy and confidentiality is the priority:

The census taker who collects your information is sworn for life to protect your data under Federal Law Title 13. Those who violate the oath face criminal penalties: Under federal law, the penalty for unlawful disclosure is a fine of up to $250,000 or imprisonment for up to 5 years, or both.

You have the right to ask that nationwide consumer credit reporting companies place “fraud alerts” in your file to let potential creditors and others know that you may be a victim of identity theft. Per the instructions at www.annualcreditreport.com these are the directions for placing an alert with each of the credit companies.
A fraud alert can make it more difficult for someone to get credit in your name because it tells creditors to follow certain procedures to protect you. Also realize it may delay your own ability to obtain credit. You may place a fraud alert in your file by calling just one of the three nationwide consumer credit reporting companies. As soon as that agency processes your fraud alert, it will notify the other two, which then also must place fraud alerts in your file.

* Equifax: 1-877-576-5734; www.alerts.equifax.com
* Experian: 1-888-397-3742; www.experian.com/fraud
* TransUnion: 1-800-680-7289; www.transunion.com

Read more since the last blog post on 2.22.2010 now from the National Emergency Cyber Alerts for more awareness about the 2010 Census Scam issues:

http://www.emergencyemail.org/newsemergency/anmviewer.asp?a=489&z=43