Centralia, Illinois demographics

Centralia, IL demographics: median age 39.1; 16.4% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Centralia city, Illinois · Incorporated city · GEOID 1712164. The survey estimates a population of 11,856 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Centralia is 39.1 years, with a 90% margin of error of 1.8 years. There are 5,094 households (±250). Age and household distributions show how these totals are composed; they do not establish which neighborhood suits a particular person.

Every count and share is an estimate. “±” is a 90% margin of error (MOE); pp means percentage points. Derived shares use the category count divided by the named universe. Aggregated category MOEs and percentage MOEs are approximate. A margin larger than half its estimate is flagged as low precision. Blank source uncertainty is shown as unavailable, never zero.

Age distribution and sex

City, state and U.S. estimates · ACS 2020–2024
Measure / survey universe	City estimate ± MOE	State estimate ± MOE	U.S. estimate ± MOE
Median age Total population · years	39.1 ±1.8	39.0 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 11,856
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Under 18	2,891 ±326	24.4% ±2.7 pp	21.8%	22.0%
18–34	2,548 ±301	21.5% ±2.5 pp	22.7%	22.8%
35–64	3,802 ±370	32.1% ±3.1 pp	38.5%	38.0%
65 and older	2,615 ±266	22.1% ±2.2 pp	17.0%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 11,856
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Male	5,857 ±239	49.4% ±1.9 pp	49.4%	49.5%
Female	5,999 ±195	50.6% ±1.5 pp	50.6%	50.5%

The age groups are mutually exclusive and cover the entire population. The sex categories follow this ACS table’s published classification; they are not a survey of gender identity.

Race and Hispanic origin

Race · B02001 · ACS 2020–2024 Total population: 11,856
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
White alone	9,762 ±296	82.3% ±2.2 pp	61.0%	61.0%
Black or African American alone	836 ±168	7.1% ±1.4 pp	13.6%	12.2%
American Indian and Alaska Native alone	4 ±6 · low precision	0.0% ±0.1 pp · low precision	0.6%	0.9%
Asian alone	194 ±82	1.6% ±0.7 pp	6.0%	6.0%
Native Hawaiian and Other Pacific Islander alone	0 ±20 · low precision	0.0% ±0.2 pp · low precision	0.0%	0.2%
Some other race alone	255 ±117	2.2% ±1.0 pp	7.9%	7.1%
Two or more races	805 ±214	6.8% ±1.8 pp	10.9%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 11,856
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Not Hispanic or Latino	11,390 ±227	96.1% ±1.3 pp	81.2%	80.7%
Hispanic or Latino	466 ±121	3.9% ±1.0 pp	18.8%	19.3%

Hispanic origin and race are separate questions. People of Hispanic or Latino origin may be of any race and appear in both tables. Do not add the Hispanic share to race shares. Race alone and two-or-more-race groups are the mutually exclusive categories of the race table.

Household types, children and living alone

Household types · B11001 · ACS 2020–2024 Households: 5,094
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Married-couple family	1,750 ±176	34.4% ±3.0 pp	45.3%	46.9%
Other family: male householder, no spouse present	275 ±127	5.4% ±2.5 pp	4.9%	5.1%
Other family: female householder, no spouse present	646 ±151	12.7% ±2.9 pp	11.9%	12.2%
Nonfamily: householder living alone	2,169 ±252	42.6% ±4.5 pp	31.2%	28.7%
Nonfamily: householder not living alone	254 ±98	5.0% ±1.9 pp	6.7%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 5,094
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Households with people under 18	1,354 ±173	26.6% ±3.1 pp	28.6%	29.5%
Households without people under 18	3,740 ±341	73.4% ±5.6 pp	71.4%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 5,094
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
One-person nonfamily households	2,169 ±252	42.6% ±4.5 pp	31.2%	28.7%
Two-person households	1,359 ±201	26.7% ±3.7 pp	32.3%	33.8%
Three-person households	654 ±185	12.8% ±3.6 pp	14.7%	15.3%
Four-person households	511 ±149	10.0% ±2.9 pp	12.6%	12.6%
Five-person households	203 ±89	4.0% ±1.7 pp	5.8%	5.9%
Six-person households	161 ±108 · low precision	3.2% ±2.1 pp · low precision	2.1%	2.2%
Seven or more people	37 ±36 · low precision	0.7% ±0.7 pp · low precision	1.3%	1.4%

A family household contains related people under the Census definition. A nonfamily household can contain one person or unrelated people sharing a home. Households with children can also appear in the household-type and size tables, so those tables must not be added together. Household estimates exclude people living in group quarters from the household universe.

Nativity and languages spoken at home

Nativity · B05002 · ACS 2020–2024 Total population: 11,856
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Native	11,458 ±226	96.6% ±1.3 pp	85.3%	85.9%
Foreign born	398 ±131	3.4% ±1.1 pp	14.7%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 10,947
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
English only	10,407 ±308	95.1% ±1.5 pp	76.0%	77.7%
Spanish	341 ±130	3.1% ±1.2 pp	14.0%	13.6%
French, Haitian, or Cajun	4 ±6 · low precision	0.0% ±0.1 pp · low precision	0.3%	0.7%
German or other West Germanic	0 ±20 · low precision	0.0% ±0.2 pp · low precision	0.3%	0.5%
Russian, Polish, or other Slavic	0 ±20 · low precision	0.0% ±0.2 pp · low precision	2.5%	0.7%
Other Indo-European	65 ±58 · low precision	0.6% ±0.5 pp · low precision	2.6%	2.0%
Korean	11 ±15 · low precision	0.1% ±0.1 pp · low precision	0.3%	0.3%
Chinese, including Mandarin and Cantonese	47 ±43 · low precision	0.4% ±0.4 pp · low precision	0.9%	1.1%
Vietnamese	0 ±20 · low precision	0.0% ±0.2 pp · low precision	0.2%	0.5%
Tagalog, including Filipino	60 ±71 · low precision	0.5% ±0.6 pp · low precision	0.7%	0.6%
Other Asian and Pacific Island	0 ±20 · low precision	0.0% ±0.2 pp · low precision	1.0%	1.1%
Arabic	12 ±21 · low precision	0.1% ±0.2 pp · low precision	0.6%	0.5%
Other and unspecified	0 ±20 · low precision	0.0% ±0.2 pp · low precision	0.6%	0.8%

Foreign born means not a U.S. citizen at birth; it includes naturalized citizens. Language categories describe speech at home among people age five and older. A language other than English at home does not establish that someone cannot speak English. This city page uses the published C16001 summary categories because the more detailed B16001 table does not provide these city records in this release.

Educational attainment

Highest completed education · B15003 · ACS 2020–2024 Population age 25 and older: 7,963
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Less than high school graduate	846 ±194	10.6% ±2.4 pp	9.5%	10.4%
High school graduate or equivalency	2,845 ±359	35.7% ±4.2 pp	25.1%	26.0%
Some college, no degree	2,004 ±271	25.2% ±3.2 pp	19.2%	19.1%
Associate’s degree	965 ±184	12.1% ±2.3 pp	8.3%	8.8%
Bachelor’s degree	785 ±175	9.9% ±2.2 pp	22.6%	21.6%
Graduate or professional degree	518 ±152	6.5% ±1.9 pp	15.3%	14.1%

The denominator excludes residents under 25. Each person is counted in the highest attainment category they completed. This table does not measure the quality of local schools or the education level of every current student.

Residence one year earlier

Geographic mobility · B07003 · ACS 2020–2024 Population age 1 and older: 11,758
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Same house	10,476 ±385	89.1% ±2.9 pp	88.9%	87.7%
Moved within same county	858 ±338	7.3% ±2.9 pp	6.4%	6.3%
Moved from a different county in the same state	347 ±121	3.0% ±1.0 pp	2.4%	3.1%
Moved from a different state	63 ±46 · low precision	0.5% ±0.4 pp · low precision	1.6%	2.3%
Moved from abroad	14 ±16 · low precision	0.1% ±0.1 pp · low precision	0.6%	0.6%

These are respondents’ residence patterns one year before their survey response, pooled across the five-year window. They are not a net migration count for 2025. A person can move to a different house within the same city or county; moves within the same county should not automatically be interpreted as new arrivals to the city.

Health insurance, internet access and veterans

6.5% of Centralia residents (±1.5 percentage points) had no health insurance coverage when surveyed, compared with 6.9% in Illinois and 8.4% nationally. 85.1% of households subscribe to broadband of any type, including cellular data plans. A subscription is not the same as available service: the FCC National Broadband Map shows providers at a specific address.

City, state and U.S. shares · ACS 2020–2024
Measure	Centralia	Illinois	U.S.	Compared with Illinois
People without health insurance Civilian noninstitutionalized population	6.5% ±1.5 pp	6.9%	8.4%	Not statistically different
Households with a broadband subscription Households	85.1% ±3.5 pp	90.8%	91.0%	Lower
Veterans Civilian population age 18 and older	6.5% ±1.7 pp	4.8%	6.2%	Higher

Reading and reusing the estimates

The Census table links above lead to the original detailed tables. Counts, source universes and uncertainty are retained in the source observation download for Centralia . Compare these figures with the same survey window; do not compare one city’s five-year estimate with another city’s annual estimate as though they measured the same period. For methods, see uncertainty and denominator calculations.

Read Centralia housing and cost context or return to the city profile.