Your public libraries will most likely have both Ancestry.com and Heritage Quest.com free for anyone to use while at the library and with a library card you can use Heritage Quest at home…Heritage Quest has census records as does Ancestry.com.

Another free online resource is USGenWeb at http://www.usgenweb.org/ this sprawling all-volunteer site is packed with how-to tips, queries and records for every state and most counties within those states. Special projects usgenweb.org/projects cover subjects such as censuses, tombstones and family group sheets. Do not miss the easy-to-overlook search of the entire site http://searches.rootsweb.ancestry.com/htdig/search.html/

Those are all of the free census records that I can think of at the moment. There are some state specific census records out there but you should be able to find those with the US GenWeb link that I added.

They have transcribed the censuses but you can view the original images. There are errors in their transcriptions but when you view the original images you will pity the transcribers.

I don’t know any place that has all of the U.S. censuses for free on the internet.

HeritageQuest.com has free census records from 1790-1930 (actual images for all years). There’s no index for 1830, ’40, ’50, or 1930, but you can browse records for those years. If you have a library card, you can access the census records through and from your library website by putting in your library card’s number.

That’s the only two I can think of because I use them the most, other sites have free access to indexes/data from census for years you are looking for.