Prior to 2011, the introduced Mediterranean gecko (Hemidactylus turcicus) was known from 11 of Oklahoma's 77 counties. Following the discovery of a small breeding population in the city of Lawton, Comanche County, Oklahoma, in 2011, we began surveys to determine whether they had become established in the southwestern part of the state. Here we add 11 new county records to their previously described distribution, defining a new western limit for H. turcicus in the state.