Jefferson County Population

1870–2026

580.54K

2026 projection

0.4% since 2020 (decrease)

0100K200K300K400K500K600K18801900192019401960198020002020

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 Jefferson County. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
2026580,543+920.02%
2025580,451+920.02%
2024580,359+2,2750.39%
2023578,084+1,3810.24%
2022576,703-4,2990.74%
2021581,002-2,1290.37%
2020583,131+3310.06%
2019582,800+2,7730.48%
2018580,027+3,9860.69%
2017576,041+4,2180.74%

Showing 10 of 30 years.

Jefferson County Demographics

40.5median age

Median age

Female41.6 yrs
Male39.4 yrs

Adults

472,407
103,643 seniors (65+) · 22% of adults368,764 other adults

Sex

Female 49.7% · 287,789Male 50.3% · 291,588

Population by age

MaleFemale85+ years, male: 4,61385+ years, female: 6,60880–84 years, male: 4,44880–84 years, female: 6,76075–79 years, male: 8,10475–79 years, female: 9,76570–74 years, male: 13,27470–74 years, female: 15,48465–69 years, male: 17,07665–69 years, female: 17,51160–64 years, male: 18,75960–64 years, female: 19,74055–59 years, male: 18,60655–59 years, female: 19,51950–54 years, male: 18,37150–54 years, female: 17,73545–49 years, male: 18,39345–49 years, female: 17,50240–44 years, male: 21,47340–44 years, female: 20,02735–39 years, male: 24,15535–39 years, female: 22,25130–34 years, male: 25,25730–34 years, female: 23,08325–29 years, male: 21,36625–29 years, female: 19,37920–24 years, male: 15,78020–24 years, female: 14,75315–19 years, male: 17,34115–19 years, female: 15,21110–14 years, male: 15,25810–14 years, female: 14,8905–9 years, male: 15,4325–9 years, female: 14,4600–4 years, male: 13,8820–4 years, female: 13,11185+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–410K10K20K20K

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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 5,794 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

Jefferson County Income

$110,656median household income

Median household income

$110,656

Half of households earn more, half earn less

Median earnings

$68,137

Typical yearly pay for a worker 25 or older.

Poverty rate

6.7%

About 1 in 15 residents

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

Jefferson County Marital Status

52% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married52%52%51%
Never married32%35%28%
Divorced12%10%14%
Widowed4%2%7%
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