In the county, the population was spread out with 25.70% under the age of 18, 5.80% from 18 to 24, 31.30% from 25 to 44, 27.10% from 45 to 64, and 10.00% who were 65 years of age or older.
Hunterdon County's median income for a household was $79,888, which made it the fourth-highest county in the country based on median household income.