Mercer County Population

1840–2026

401.25K

2026 projection

3.8% since 2020 (increase)

0100K200K300K400K500K1840186018801900192019401960198020002020

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 Mercer County. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
2026401,249+1,9600.49%
2025399,289+1,9600.49%
2024397,329+5,9601.52%
2023391,369+4,3451.12%
2022387,024+4,8851.28%
2021382,139-4,2951.11%
2020386,434+18,3875.00%
2019368,047-6730.18%
2018368,720+2310.06%
2017368,489+5600.15%

Showing 10 of 33 years.

Mercer County Demographics

39.5median age

Median age

Female40.8 yrs
Male38 yrs

Adults

301,036
61,557 seniors (65+) · 20% of adults239,479 other adults

Sex

Female 50.6% · 195,136Male 49.4% · 190,728

Population by age

MaleFemale85+ years, male: 2,82485+ years, female: 5,09880–84 years, male: 2,91480–84 years, female: 4,22375–79 years, male: 4,62775–79 years, female: 5,88170–74 years, male: 6,46470–74 years, female: 8,20565–69 years, male: 10,33765–69 years, female: 10,98460–64 years, male: 12,42960–64 years, female: 13,02655–59 years, male: 12,18355–59 years, female: 12,46750–54 years, male: 13,05450–54 years, female: 13,17845–49 years, male: 12,76145–49 years, female: 12,81340–44 years, male: 12,89940–44 years, female: 14,01935–39 years, male: 12,47335–39 years, female: 10,99330–34 years, male: 12,32030–34 years, female: 11,73525–29 years, male: 12,14325–29 years, female: 11,56120–24 years, male: 13,57520–24 years, female: 13,37715–19 years, male: 13,83415–19 years, female: 13,72510–14 years, male: 12,81810–14 years, female: 12,7745–9 years, male: 11,9545–9 years, female: 10,6120–4 years, male: 11,1190–4 years, female: 10,46585+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 3,859 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

Mercer County Income

$100,645median household income

Median household income

$100,645

Half of households earn more, half earn less

Median earnings

$60,967

Typical yearly pay for a worker 25 or older.

Poverty rate

10.3%

About 1 in 10 residents

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

Mercer County Marital Status

47% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married47%49%44%
Never married38%40%36%
Divorced9%7%10%
Widowed5%2%8%
Separated2%2%3%

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