Celina is a city in Collin and Denton counties in the U.S. state of Texas. Celina is part of the Dallas–Fort Worth metroplex. The population was 16,739 at the 2020 census, and according to 2023 census estimates, the city is estimated to have a population of 43,317. The Dallas Business Journal has ranked Celina as the fastest-growing city in the Dallas–Fort Worth metroplex for three consecutive years. The population growth rate of Celina was 50.8% from 2015 to 2019.