The epicenter of the outbreak is Tarrant County, which has now confirmed 10 cases, and the epicenter of cases in Tarrant County seems to be at Eagle Mountain International Church.
MORE: http://blogs.dallasobserver.com/unfairpark/2013/08/theres_a_measles_outbreak_at_v.php
See also...
More Michigan parents refusing to vaccinate, worrying health officials
http://www.hollandsentinel.com/news/x1592819793/More-Michigan-parents-refusing-to-vaccinate-worrying-health-officials
Vermont ranks high on list of non-medical immunization exemptions
http://www.vermontbiz.com/news/august/vermont-ranks-high-list-non-medical-immunization-exemptions
Ohio the only one of 50 states without immunization law for youngest kids
http://www.wkyc.com/news/article/310234/3/Investigator-Ohio-pre-schoolers-at-special-risk