Conroe is a city in Texas, United States. It is the seat of Montgomery County and a principal city in the Houston – The Woodlands-Sugar Land metropolitan area. The city is named after Northern-born Union Cavalry officer and Houston lumberman Isaac Conroe. The city originally gained in wealth due to the lumber and oil industries. According to the Census Bureau, Conroe was the fastest-growing large city in the United States between July 1, 2015, and July 1, 2018.