This Patrick Tierney (my GGrandfather)settled in San Francisco, Ca. by way of Lowell or Waltham Mass. He was married to Margaret DILLON. Her mother Julia Dillon was born in Athenry, Galway, Ire. I cannot connect him to any particular place in Ireland, but if he met Margaret in her mother's hometown, it would be Athenry. 1870 census places them all in San Francisco. The Dillons seem to be in the iron/foundry/moulder trade. The Tierneys laborers. Patrick & Margaret had: Peter 1871; Julia 1873; John James 1875; Maggy 1878 and Mary 1879. All born in San Francisco.