If you live in the Bay Area of California and are looking to conduct Irish genealogical research then the United Irish Cultural Center in San Francisco is a must stop. Since it's opening in 1975, the center has provided members with dining and banquet facilities for social, recreational, athletic, and cultural activities.
For genealogists the main facility is the Patrick J. Dowling library. It holds over 3,000 titles on subjects ranging from archaeology and architecture to mythology and folklore. More specifically, the library has a considerable genealogy and history collection. This 2010 listing shows the available genealogy titles and has more than likely been added to since then.
There are also considerable journal, newspaper, and microfilm and microfiche collections to consult.
The United Irish Cultural Center is located near the San Francicso zoo on the corner of 45th Avenue and Wawona St. You can contact the library at firstname.lastname@example.org.