Irmo, South Carolina demographics

Irmo, SC demographics: median age 40.3; 39.2% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Irmo town, South Carolina · Incorporated town · GEOID 4535890. The survey estimates a population of 11,813 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Irmo is 40.3 years, with a 90% margin of error of 2.0 years. There are 4,632 households (±288). 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	40.3 ±2.0	40.2 ±0.2	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 11,813
Category	Count ± MOE	Share ± MOE (pp)	South Carolina	U.S.
Under 18	2,701 ±442	22.9% ±3.7 pp	21.4%	22.0%
18–34	2,477 ±492	21.0% ±4.2 pp	22.0%	22.8%
35–64	4,801 ±636	40.6% ±5.4 pp	37.7%	38.0%
65 and older	1,834 ±301	15.5% ±2.5 pp	18.9%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 11,813
Category	Count ± MOE	Share ± MOE (pp)	South Carolina	U.S.
Male	5,901 ±396	50.0% ±3.3 pp	48.7%	49.5%
Female	5,912 ±390	50.0% ±3.3 pp	51.3%	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: 11,813
Category	Count ± MOE	Share ± MOE (pp)	South Carolina	U.S.
White alone	6,877 ±710	58.2% ±6.0 pp	63.3%	61.0%
Black or African American alone	3,287 ±623	27.8% ±5.3 pp	24.8%	12.2%
American Indian and Alaska Native alone	2 ±4 · low precision	0.0% ±0.0 pp · low precision	0.4%	0.9%
Asian alone	504 ±416 · low precision	4.3% ±3.5 pp · low precision	1.8%	6.0%
Native Hawaiian and Other Pacific Islander alone	0 ±22 · low precision	0.0% ±0.2 pp · low precision	0.1%	0.2%
Some other race alone	222 ±210 · low precision	1.9% ±1.8 pp · low precision	2.8%	7.1%
Two or more races	921 ±418	7.8% ±3.5 pp	6.8%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 11,813
Category	Count ± MOE	Share ± MOE (pp)	South Carolina	U.S.
Not Hispanic or Latino	11,146 ±300	94.4% ±2.5 pp	92.6%	80.7%
Hispanic or Latino	667 ±293	5.6% ±2.5 pp	7.4%	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: 4,632
Category	Count ± MOE	Share ± MOE (pp)	South Carolina	U.S.
Married-couple family	2,193 ±293	47.3% ±5.6 pp	47.1%	46.9%
Other family: male householder, no spouse present	263 ±195 · low precision	5.7% ±4.2 pp · low precision	4.5%	5.1%
Other family: female householder, no spouse present	836 ±227	18.0% ±4.8 pp	13.4%	12.2%
Nonfamily: householder living alone	1,038 ±251	22.4% ±5.2 pp	29.2%	28.7%
Nonfamily: householder not living alone	302 ±168 · low precision	6.5% ±3.6 pp · low precision	5.8%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 4,632
Category	Count ± MOE	Share ± MOE (pp)	South Carolina	U.S.
Households with people under 18	1,465 ±237	31.6% ±4.7 pp	28.6%	29.5%
Households without people under 18	3,167 ±339	68.4% ±6.0 pp	71.4%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 4,632
Category	Count ± MOE	Share ± MOE (pp)	South Carolina	U.S.
One-person nonfamily households	1,038 ±251	22.4% ±5.2 pp	29.2%	28.7%
Two-person households	1,678 ±416	36.2% ±8.7 pp	36.3%	33.8%
Three-person households	1,149 ±379	24.8% ±8.0 pp	15.4%	15.3%
Four-person households	369 ±162	8.0% ±3.5 pp	11.6%	12.6%
Five-person households	233 ±120 · low precision	5.0% ±2.6 pp · low precision	5.0%	5.9%
Six-person households	129 ±80 · low precision	2.8% ±1.7 pp · low precision	1.7%	2.2%
Seven or more people	36 ±54 · low precision	0.8% ±1.2 pp · low precision	0.9%	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: 11,813
Category	Count ± MOE	Share ± MOE (pp)	South Carolina	U.S.
Native	11,143 ±314	94.3% ±2.6 pp	94.2%	85.9%
Foreign born	670 ±310	5.7% ±2.6 pp	5.8%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 11,391
Category	Count ± MOE	Share ± MOE (pp)	South Carolina	U.S.
English only	10,282 ±485	90.3% ±4.0 pp	91.6%	77.7%
Spanish	527 ±271 · low precision	4.6% ±2.4 pp · low precision	5.3%	13.6%
French, Haitian, or Cajun	9 ±15 · low precision	0.1% ±0.1 pp · low precision	0.3%	0.7%
German or other West Germanic	53 ±58 · low precision	0.5% ±0.5 pp · low precision	0.3%	0.5%
Russian, Polish, or other Slavic	38 ±88 · low precision	0.3% ±0.8 pp · low precision	0.4%	0.7%
Other Indo-European	0 ±22 · low precision	0.0% ±0.2 pp · low precision	0.8%	2.0%
Korean	0 ±22 · low precision	0.0% ±0.2 pp · low precision	0.1%	0.3%
Chinese, including Mandarin and Cantonese	0 ±22 · low precision	0.0% ±0.2 pp · low precision	0.2%	1.1%
Vietnamese	371 ±369 · low precision	3.3% ±3.2 pp · low precision	0.2%	0.5%
Tagalog, including Filipino	71 ±133 · low precision	0.6% ±1.2 pp · low precision	0.2%	0.6%
Other Asian and Pacific Island	24 ±38 · low precision	0.2% ±0.3 pp · low precision	0.4%	1.1%
Arabic	16 ±26 · low precision	0.1% ±0.2 pp · low precision	0.1%	0.5%
Other and unspecified	0 ±22 · low precision	0.0% ±0.2 pp · low precision	0.3%	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: 8,366
Category	Count ± MOE	Share ± MOE (pp)	South Carolina	U.S.
Less than high school graduate	352 ±166	4.2% ±2.0 pp	9.9%	10.4%
High school graduate or equivalency	1,724 ±403	20.6% ±4.7 pp	28.2%	26.0%
Some college, no degree	1,968 ±378	23.5% ±4.4 pp	19.8%	19.1%
Associate’s degree	1,042 ±357	12.5% ±4.2 pp	10.0%	8.8%
Bachelor’s degree	2,317 ±581	27.7% ±6.8 pp	19.8%	21.6%
Graduate or professional degree	963 ±220	11.5% ±2.6 pp	12.3%	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: 11,755
Category	Count ± MOE	Share ± MOE (pp)	South Carolina	U.S.
Same house	9,641 ±866	82.0% ±7.3 pp	87.2%	87.7%
Moved within same county	421 ±239 · low precision	3.6% ±2.0 pp · low precision	5.5%	6.3%
Moved from a different county in the same state	729 ±284	6.2% ±2.4 pp	3.1%	3.1%
Moved from a different state	964 ±864 · low precision	8.2% ±7.3 pp · low precision	3.7%	2.3%
Moved from abroad	0 ±22 · low precision	0.0% ±0.2 pp · low precision	0.4%	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

7.4% of Irmo residents (±3.2 percentage points) had no health insurance coverage when surveyed, compared with 9.6% in South Carolina and 8.4% nationally. 92.4% 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	Irmo	South Carolina	U.S.	Compared with South Carolina
People without health insurance Civilian noninstitutionalized population	7.4% ±3.2 pp	9.6%	8.4%	Not statistically different
Households with a broadband subscription Households	92.4% ±2.6 pp	88.8%	91.0%	Higher
Veterans Civilian population age 18 and older	8.6% ±2.3 pp	8.3%	6.2%	Not statistically different

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 Irmo . 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 Irmo housing and cost context or return to the city profile.