Johnson County Population

1860–2026

642.98K

2026 projection

5.2% since 2020 (increase)

0100K200K300K400K500K600K700K186018801900192019401960198020002020

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 Johnson County. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
2026642,980+6,0740.95%
2025636,906+6,0740.96%
2024630,832+5,5710.89%
2023625,261+5,5680.90%
2022619,693+4,6260.75%
2021615,067+3,9380.64%
2020611,129+8,1811.36%
2019602,948+3,9030.65%
2018599,045+6,9901.18%
2017592,055+5,4540.93%

Showing 10 of 31 years.

Johnson County Demographics

38.6median age

Median age

Female39.4 yrs
Male37.7 yrs

Adults

474,880
99,005 seniors (65+) · 21% of adults375,875 other adults

Sex

Female 50.6% · 313,839Male 49.4% · 306,792

Population by age

MaleFemale85+ years, male: 3,93385+ years, female: 7,23280–84 years, male: 4,86980–84 years, female: 6,76775–79 years, male: 7,84475–79 years, female: 8,91170–74 years, male: 12,15670–74 years, female: 15,15165–69 years, male: 15,54365–69 years, female: 16,59960–64 years, male: 18,10860–64 years, female: 19,65755–59 years, male: 18,02555–59 years, female: 18,93650–54 years, male: 19,42950–54 years, female: 19,32345–49 years, male: 19,69845–49 years, female: 19,70240–44 years, male: 23,04940–44 years, female: 21,89135–39 years, male: 21,99235–39 years, female: 22,75730–34 years, male: 21,56430–34 years, female: 20,95925–29 years, male: 20,89425–29 years, female: 20,30520–24 years, male: 18,20820–24 years, female: 17,80415–19 years, male: 20,94815–19 years, female: 19,22310–14 years, male: 21,51110–14 years, female: 20,8855–9 years, male: 20,5665–9 years, female: 19,9210–4 years, male: 18,4550–4 years, female: 17,81685+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–410K10K20K20K

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 6,206 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

Johnson County Income

$109,208median household income

Median household income

$109,208

Half of households earn more, half earn less

Median earnings

$67,570

Typical yearly pay for a worker 25 or older.

Poverty rate

5.4%

About 1 in 18 residents

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

Johnson County Marital Status

57% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married57%58%55%
Never married29%32%26%
Divorced10%8%12%
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