The American Community Survey provides data from sampling. Not all data are available in the yearly sample at all geographies; city level data are only in the 3 and 5 year surveys. The ACS is available in Social Explorer
The Library Catalog searches the Library's collections of books.
Immigration is a topic in many different disciplines. These are subject specific databases that have broad coverage of the literature. There will be overlapping coverage but each will have unique articles.
Use the FindIt! button to locate full text of articles that are not included in the database.