Hamilton County Population

1830–2026

394.39K

2026 projection

13% since 2020 (increase)

0100K200K300K400K1850190019502000

Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.

Use the left and right arrow keys to inspect population observations.

Population by year

Population estimates for Hamilton County. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
2026394,387+7,3511.90%
2025387,036+7,3511.94%
2024379,685+7,2351.94%
2023372,450+6,4141.75%
2022366,036+8,4942.38%
2021357,542+8,5312.44%
2020349,011+11,0563.27%
2019337,955+7,3202.21%
2018330,635+7,4102.29%
2017323,225+7,0042.21%

Showing 10 of 34 years.

Hamilton County Demographics

38.4median age

Median age

Female39.1 yrs
Male37.6 yrs

Adults

272,320
50,673 seniors (65+) · 19% of adults221,647 other adults

Sex

Female 50.8% · 185,327Male 49.2% · 179,729

Population by age

MaleFemale85+ years, male: 1,67485+ years, female: 3,40580–84 years, male: 2,04680–84 years, female: 2,63175–79 years, male: 4,46475–79 years, female: 5,48370–74 years, male: 6,82270–74 years, female: 6,67265–69 years, male: 7,64165–69 years, female: 9,83560–64 years, male: 10,32360–64 years, female: 10,45855–59 years, male: 11,13155–59 years, female: 11,65650–54 years, male: 12,70150–54 years, female: 12,56345–49 years, male: 12,68645–49 years, female: 12,74840–44 years, male: 13,34640–44 years, female: 14,76035–39 years, male: 13,50835–39 years, female: 13,54930–34 years, male: 11,07830–34 years, female: 11,66825–29 years, male: 10,10725–29 years, female: 10,42320–24 years, male: 10,62820–24 years, female: 10,17315–19 years, male: 12,95515–19 years, female: 12,57810–14 years, male: 13,88310–14 years, female: 13,7975–9 years, male: 13,8015–9 years, female: 12,5080–4 years, male: 10,9350–4 years, female: 10,42085+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–45K5K10K10K

Hover or tap an age group to see exact counts. Use the up and down arrow keys to inspect age groups.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101

Race and ethnicity

Tap a square or a group below to highlight it.

Each square is about 1% of residents (roughly 3,651 people).

Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002

Hamilton County Income

$121,530median household income

Median household income

$121,530

Half of households earn more, half earn less

Median earnings

$73,465

Typical yearly pay for a worker 25 or older.

Poverty rate

4.4%

About 1 in 23 residents

U.S. Census Bureau, 2024 ACS 5-year estimates · Tables S1901, S1501, S1701

Hamilton County Marital Status

61% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married61%64%59%
Never married26%27%24%
Divorced9%7%10%
Widowed4%2%6%
Separated<1%<1%<1%

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201

Sources

8 sources, all from the U.S. Census Bureau

Population

American Community Survey, 2024 5-year