This coming weekend, Ancestry are offering free access to the 1930 United States federal census.
The 1930 United States Census began on 2nd April 1930 for the general population of the United States (excluding Alaska, where it took place on 1st October 1929). It's the most recent United States Census for which personal data is available.
It provides address, names of persons and their relationship to head of household, gender, ethnicity (they said color or race), age, marital status, age at first marriage, college attendance, ability to read and write and speak English, birthplace, and birthplace of parents, language spoken before coming to the United States, year of immigration, whether naturalized, whether home is owned or rented, value or rent of home, whether home is a farm, whether there is a radio, occupation, industry, whether employed, whether a military veteran.
You do need to give your name and email address, but that's all, and then you get immediate access to the summary records, and you can download the page image for free.
Search Ancestry's 1930 United States Census records and read more.
The images have been freely available for some time (see Free Access to the 1930 United States Census blog of 3rd July 2011) from the Internet Archive but it was always useful to use Ancestry or Family Search to identify the image you needed.