Join Harris County ESD 11 Mobile Healthcare CEO, Doug Hooten and special guests as we discuss mobile healthcare in Spring and Klein, TX.ABOUT HCESD11: Harris County Emergency Services District No. 11 (ESD11) provides emergency medical services to over 600,000 people across over 177 square miles of North Harris County, with a service area larger than the City of Atlanta, Georgia. ESD11 is the largest Emergency Services District by population in the State of Texas. read less