Allen’s population reached 104,636 residents in 2018, more than doubling from just over 45,000 in the year 2000. The City’s population is projected to reach 117,606 by 2023. Allen is the 27th fastest-growing city in the nation.
Allen is also located in one of the fastest-growing counties in the Dallas-Fort Worth metropolitan area. Collin County’s population reached 1,004,108 in 2017, and will reach 1,150,943 in 2022. Collin County is the 21st fastest-growing county in the nation.