Take a look at these sites and search away! Included are some magazines and journals as well as newspapers.
Listed are only those that are available online. As always, there are tons more available via microfilm and in original form via libraries and archives.
Please note that some are free and some require a subscription or a login from a university library. Some are indexed, and some are not.
- The Clan-na-Gael Journal
- Duffy's Irish Catholic Magazine
- The Gaelic American
- Irish Press
- Irish Tribune
Genealogy Bank (subscription):
- Irish American Weekly
- Irish Citizen
- Irish Nation
- Irish Voice
- Irish World
- Shamrock, Hibernian Chronicle
- Western Star
Boston College (community access only)
- The Exile
- The Shamrock, or Hibernian Chronicle
- The Shamrock
- United States Catholic Miscellany
- The Western Star and Harp of Erin
- Irish American and other ethnic newspaper collections in process
Other universities, such as the University of Wisconsin, Penn State University, and Penn also have newspaper collections that can be accessed if one has community access through the university. You might check with you nearest major university library to see what they have in their collection or have easy access to.
The Google News Archive does not seem to have any Irish American historic newspapers but does have 3 titles regarding Irish immigrants in Canada.
And finally, if you are interested in historic newspapers from Ireland (not America or Canada) you can also access The Irish Newspaper Archives, which is a subscription site.