Looking for Ancestery Information Jeremiah Mccarthy and Bridget Curtain

Hello I have traced my origin to Newmarket. I am trying to find my lineage to as far as I can go. My search dead ended with the following: Jeremiah Mccarthy 1800-1878 married to Bridget Curtin 1803-1878. Both immigrated to the U.S. but don't know much more than that. Any decendents out there? I never new my father so I don't have any family history past the immigration.