St. John Population

1880–2026

25,761

2026 projection

26.9% since 2020 (increase)

05K10K15K20K25K30K18801900192019401960198020002020

Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal 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 St. John. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
202625,761+9203.70%
202524,841+6662.75%
202424,175+6102.59%
202323,565+7773.41%
202222,788+1,2896.00%
202121,499+1,1965.89%
202020,303+6873.50%
201919,616+9114.87%
201818,705+9385.28%
201717,767+5142.98%

Showing 10 of 27 years.

The 2020 row compares the April 1 Census count with the July 1, 2019 estimate (about nine months). Its Growth and Annual change therefore do not represent a full year.

Growth since 2020, compared

St. John is growing faster than Lake County, Indiana, and the U.S.

  • St. John+21.2%
  • United States+3.1%
  • Indiana+2.7%
  • Lake County+1.1%

Change from July 1, 2020 to July 1, 2025 population estimates—not annualized growth or site projections.

Source: U.S. Census Bureau. U.S. totals are summed from the 50 states and D.C.; unavailable comparisons are omitted.

St. John Demographics

42.3median age

Median age

Female42.9 yrs
Male42 yrs

Adults

17,116
4,290 seniors (65+) · 25% of adults12,826 other adults

Sex

Female 49% · 11,056Male 51% · 11,511

Population by age

MaleFemale85+ years, male: 13485+ years, female: 17580–84 years, male: 20980–84 years, female: 15375–79 years, male: 53375–79 years, female: 38770–74 years, male: 50370–74 years, female: 64565–69 years, male: 78365–69 years, female: 76860–64 years, male: 69860–64 years, female: 73755–59 years, male: 74355–59 years, female: 67750–54 years, male: 87650–54 years, female: 91645–49 years, male: 65245–49 years, female: 83740–44 years, male: 1,01940–44 years, female: 75135–39 years, male: 54035–39 years, female: 80630–34 years, male: 52730–34 years, female: 51025–29 years, male: 36525–29 years, female: 37120–24 years, male: 81220–24 years, female: 50715–19 years, male: 85515–19 years, female: 87010–14 years, male: 1,11710–14 years, female: 8265–9 years, male: 7105–9 years, female: 5950–4 years, male: 4350–4 years, female: 52585+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–45005001K1K

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 226 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

St. John Income

$131,467median household income

Median household income

$131,467

Half of households earn more, half earn less

Median earnings

$82,199

Typical yearly pay for a worker 25 or older.

Poverty rate

2.2%

About 1 in 47 residents

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

St. John Marital Status

64% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married64%64%64%
Never married25%29%21%
Divorced5%4%6%
Widowed6%3%8%
Separated<1%<1%<1%

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

Sources

14 sources

Population

American Community Survey, 2024 5-year

Additional sources