Decatur Population

1860–2026

67,179

2026 projection

4.7% since 2020 (decrease)

020K40K60K80K100K186018801900192019401960198020002020

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 Decatur. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
202667,179-7051.04%
202567,884-5240.77%
202468,408-3450.50%
202368,753-5930.86%
202269,346-1,0011.42%
202170,347-1750.25%
202070,522-4950.70%
201971,017-3810.53%
201871,398-6550.91%
201772,053-6600.91%

Showing 10 of 32 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

Decatur has a population change lower than Macon County, Illinois, and the U.S.

  • United States+3.1%
  • Illinois−0.6%
  • Macon County−4.3%
  • Decatur−4.7%

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.

Decatur Demographics

39.2median age

Median age

Female40.4 yrs
Male38.1 yrs

Adults

55,129
14,840 seniors (65+) · 27% of adults40,289 other adults

Sex

Female 52.7% · 36,794Male 47.3% · 33,021

Population by age

MaleFemale85+ years, male: 87585+ years, female: 1,45580–84 years, male: 74680–84 years, female: 1,15475–79 years, male: 1,01975–79 years, female: 1,38670–74 years, male: 1,65170–74 years, female: 1,95465–69 years, male: 2,08765–69 years, female: 2,51360–64 years, male: 2,15260–64 years, female: 2,14555–59 years, male: 2,22755–59 years, female: 2,41350–54 years, male: 1,65850–54 years, female: 1,77345–49 years, male: 1,78945–49 years, female: 2,02740–44 years, male: 1,54340–44 years, female: 1,71535–39 years, male: 1,94035–39 years, female: 2,42830–34 years, male: 2,28430–34 years, female: 2,35125–29 years, male: 2,17625–29 years, female: 2,56520–24 years, male: 2,52420–24 years, female: 2,68915–19 years, male: 2,10415–19 years, female: 2,38710–14 years, male: 2,05810–14 years, female: 1,6965–9 years, male: 2,0825–9 years, female: 1,9540–4 years, male: 2,1060–4 years, female: 2,18985+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–41K1K2K2K

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 698 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

Decatur Income

$51,592median household income

Median household income

$51,592

Half of households earn more, half earn less

Median earnings

$44,348

Typical yearly pay for a worker 25 or older.

Poverty rate

19.4%

About 1 in 5 residents

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

Decatur Marital Status

38% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married38%42%34%
Never married40%41%39%
Divorced13%13%13%
Widowed9%5%12%
Separated1%1%2%

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

Sources

14 sources

Population

American Community Survey, 2024 5-year

Additional sources