Sheriff Rand Henderson assumed office January 1, 2017, and is serving his first term as Sheriff . To find out more about the Montgomery County Sheriff's Office go to www.mctxsheriff.org. Montgomery County is the seventh largest sheriff's office and the 11th largest county in Texas. Nationally, Montgomery County is the 24th fastest growing county with an estimated population of 459,972. Montgomery County is located adjacent and north of Houston, Harris County, Texas and its county seat is Conroe. Follow the Montgomery County Sheriff's Office on Facebook, Twitter and Instagram @MCTXSheriff.