Ranch to Market Road 187 (RM 187) is an 81.9-mile (131.8 km) Ranch to Market Road located in Zavala, Uvalde, Bandera, and Kerr counties in the US state of Texas. The route passes through the cities of Sabinal, Utopia, and Vanderpool. The road helps connect several small south Texas ranches to major highways. RM 187 was first designated in 1945, and was extended three times during the 1940s. As of 2012, it is the longest Ranch to Market Road in the state of Texas.