In 2000, Trigg County had a recorded population of 12,597, which grew to 14,339 by 2010. The county’s youth up to age 17 grew by almost 12 percent. Cadiz grew more slowly in those 10 years, from 2,373 in 2000 to 2,558. As of 2010, Cerulean, the only Census designated place measured, had a population of 314.
According to the Census Kentucky Data Center, Trigg County saw more proportional growth than all but 13 other counties in Kentucky in those 10 years. It also had the highest proportional growth in the Pennyrile district, and one of the highest in western Kentucky overall.
Neighboring Christian County’s population grew by 2.3 percent, while Lyon County’s grew by 2.9 percent, Calloway County’s grew by 8.8 percent and Marshall County’s grew by 4.4 percent. Meanwhile Caldwell County’s population decreased by 0.6 percent and Livingston County’s decreased by 2.9 percent.
Kentucky’s total population grew by 7.4 percent over those 10 years, and the Pennyrile district’s population as a whole grew by 1.8 percent.