Census estimates as of July 1, 2013, showed the population of Leesburg at 47,673 people.
In the town, the population was spread out with 30.7% under the age of 18, 5.5% from 18 to 24, 32.9% from 25 to 44, 23.4% from 45 to 64, and 6.1% who were 65 years of age or older.