Seeking census resource

Hi, I am wondering if anyone knows of a good resource online or otherwise with which to research census information. What I am wanting to do is track population growth/decreases in a given town/city to see if it might be a good place to look at investing in real estate.

Any ideas?

check these out:

http://www.inc.com/bestcities

http://www.city-data.com/

also, more localized and up to date might be chamber of commerce - some offer good 1 year old zip code demographics.

Cheers - thanks for that. Know where I can also get Canadian info? Does there exist a site(s) with stuff from other countries also?

Cheers, C.

For U.S., what about the obvious, census.gov - loads and loads of data.

For Canada, I have no idea other than google.com