Caplen is an unincorporated community that is part of the Bolivar Peninsula census-designated place, in Galveston County, Texas, United States. On April 23, 1991, the community, and other areas of Galveston County, received an enhanced 9-1-1 system which routes calls to proper dispatchers and allows dispatchers to automatically view the addres…Caplen is an unincorporated community that is part of the Bolivar Peninsula census-designated place, in Galveston County, Texas, United States. On April 23, 1991, the community, and other areas of Galveston County, received an enhanced 9-1-1 system which routes calls to proper dispatchers and allows dispatchers to automatically view the address of the caller.