The Census Bureau does not specify exactly how you should cite its material, so you should refer to your style manual of choice. See the boxes below for more guidance.
Source: U.S. Census Bureau, "Citation Style Suggestions," retrieved 11/6/14.
APA (American Psychological Association) Point readers to raw data by providing a Web address (use "Retrieved from") or a general place that houses data sets on the site (use "Available from").
General format:
Author/Rightsholder. (Year). Title of data set (Version number) [Description of form]. Retrieved from http://
OR
Author/Rightsholder. (Year). Title of data set (Version number) [Description of form]. Location: Name of producer.
Examples: