You have received some good information in the other answers here.
To add to that good information, a nearby FamilySearch Center, operated by the LDS (Morman) Church, which among other things manages the FamilySearch.org databases, should provide electronic access to census records. Being able to see the actual census ledger images is the best, as I continue to find mis-transcriptions of entries - especially in the Ancestry.com databases. This link will help you locate the closest FamilySearch Center:
https://www.familysearch.org/locations
Those who work and volunteer there will be most helpful.
Besides providing access to the US Ancestry.com databases (including the transcription/indexing/and full images of US census records through 1930), your public library probably has a subscription to the HeritageQuest database, which includes indexing and full images of the US census records. You can probably access the Heritage Quest databases through your local public library web pages by logging into you library account, with your valid library card #, and then selecting the HeritageQuest database. If you go to the public library that provides access to Ancestry.com, a reference librarian there can also instruct you in how to best access HeritageQuest.
Besides introducing you to the electronic genealogy databases the library offers, a reference librarian can help you learn about all the other genealogy resources, "hardcopy databases" (books & periodical/journal articles) they have. Even in this electronic age, not all genealogical and historical research is available electronically - free or paid.
Public libraries are supported by taxpayer dollars. Why not use what you have already paid for? :-)
Librarians--Ask Us, We Answer!
Find your local Public Library at:
http://www.publiclibraries.com/
Best wishes