Tourlock 180+90 Revolving Door Prevents Tailgating and Piggybacking and Provides Maximum Security While Controlling Traffic Flow. There is a saying that “Everything is Bigger in Texas,” and the Dallas, Texas police department is no exception. The city of Dallas is ranked in the top 10 cities in the U.S. in terms of population, at 1.2 million people. The Dallas Police Department is the ninth largest municipal police force in the U.S., based on 3,012 sworn officers.