Boone had a population of 12,460 and 3,228 families. The population density was 1,371.6 inhabitants per square mile (529.6/km²).

The median age was 41.2 years. 22.0% of residents were under the age of 18 and 20.2% were 65 years of age or older. 24.0% of residents were under the age of 20; 5.1% were between the ages of 20 and 24; 25.4% were from 25 to 44; and 25.3% were from 45 to 64. For every 100 females there were 94.5 males, and for every 100 females age 18 and over there were