South Lyon, Michigan demographics

South Lyon, MI demographics: median age 41.8; 47.2% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · South Lyon city, Michigan · Incorporated city · GEOID 2675100. The survey estimates a population of 11,950 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in South Lyon is 41.8 years, with a 90% margin of error of 2.6 years. There are 4,976 households (±265). 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	41.8 ±2.6	40.2 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 11,950
Category	Count ± MOE	Share ± MOE (pp)	Michigan	U.S.
Under 18	2,454 ±348	20.5% ±2.9 pp	21.2%	22.0%
18–34	2,453 ±397	20.5% ±3.3 pp	22.4%	22.8%
35–64	4,988 ±531	41.7% ±4.4 pp	37.8%	38.0%
65 and older	2,055 ±277	17.2% ±2.3 pp	18.6%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 11,950
Category	Count ± MOE	Share ± MOE (pp)	Michigan	U.S.
Male	5,934 ±313	49.7% ±2.6 pp	49.6%	49.5%
Female	6,016 ±312	50.3% ±2.6 pp	50.4%	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: 11,950
Category	Count ± MOE	Share ± MOE (pp)	Michigan	U.S.
White alone	10,708 ±409	89.6% ±3.4 pp	73.7%	61.0%
Black or African American alone	239 ±196 · low precision	2.0% ±1.6 pp · low precision	13.3%	12.2%
American Indian and Alaska Native alone	6 ±10 · low precision	0.1% ±0.1 pp · low precision	0.5%	0.9%
Asian alone	285 ±177 · low precision	2.4% ±1.5 pp · low precision	3.4%	6.0%
Native Hawaiian and Other Pacific Islander alone	0 ±18 · low precision	0.0% ±0.2 pp · low precision	0.0%	0.2%
Some other race alone	26 ±42 · low precision	0.2% ±0.4 pp · low precision	1.9%	7.1%
Two or more races	686 ±333	5.7% ±2.8 pp	7.1%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 11,950
Category	Count ± MOE	Share ± MOE (pp)	Michigan	U.S.
Not Hispanic or Latino	11,645 ±171	97.4% ±1.4 pp	94.1%	80.7%
Hispanic or Latino	305 ±172 · low precision	2.6% ±1.4 pp · low precision	5.9%	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: 4,976
Category	Count ± MOE	Share ± MOE (pp)	Michigan	U.S.
Married-couple family	2,534 ±200	50.9% ±3.0 pp	46.1%	46.9%
Other family: male householder, no spouse present	269 ±106	5.4% ±2.1 pp	4.9%	5.1%
Other family: female householder, no spouse present	327 ±113	6.6% ±2.2 pp	11.5%	12.2%
Nonfamily: householder living alone	1,494 ±269	30.0% ±5.2 pp	30.7%	28.7%
Nonfamily: householder not living alone	352 ±133	7.1% ±2.6 pp	6.9%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 4,976
Category	Count ± MOE	Share ± MOE (pp)	Michigan	U.S.
Households with people under 18	1,230 ±170	24.7% ±3.2 pp	27.1%	29.5%
Households without people under 18	3,746 ±307	75.3% ±4.7 pp	72.9%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 4,976
Category	Count ± MOE	Share ± MOE (pp)	Michigan	U.S.
One-person nonfamily households	1,494 ±269	30.0% ±5.2 pp	30.7%	28.7%
Two-person households	1,781 ±266	35.8% ±5.0 pp	35.1%	33.8%
Three-person households	868 ±206	17.4% ±4.0 pp	14.3%	15.3%
Four-person households	486 ±126	9.8% ±2.5 pp	11.7%	12.6%
Five-person households	238 ±89	4.8% ±1.8 pp	5.2%	5.9%
Six-person households	73 ±87 · low precision	1.5% ±1.7 pp · low precision	1.9%	2.2%
Seven or more people	36 ±43 · low precision	0.7% ±0.9 pp · low precision	1.1%	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: 11,950
Category	Count ± MOE	Share ± MOE (pp)	Michigan	U.S.
Native	11,178 ±312	93.5% ±2.6 pp	92.8%	85.9%
Foreign born	772 ±314	6.5% ±2.6 pp	7.2%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 11,444
Category	Count ± MOE	Share ± MOE (pp)	Michigan	U.S.
English only	10,886 ±264	95.1% ±1.6 pp	89.6%	77.7%
Spanish	210 ±144 · low precision	1.8% ±1.3 pp · low precision	3.1%	13.6%
French, Haitian, or Cajun	0 ±18 · low precision	0.0% ±0.2 pp · low precision	0.2%	0.7%
German or other West Germanic	103 ±90 · low precision	0.9% ±0.8 pp · low precision	0.5%	0.5%
Russian, Polish, or other Slavic	19 ±30 · low precision	0.2% ±0.3 pp · low precision	0.6%	0.7%
Other Indo-European	88 ±67 · low precision	0.8% ±0.6 pp · low precision	1.8%	2.0%
Korean	39 ±51 · low precision	0.3% ±0.4 pp · low precision	0.2%	0.3%
Chinese, including Mandarin and Cantonese	19 ±30 · low precision	0.2% ±0.3 pp · low precision	0.5%	1.1%
Vietnamese	56 ±64 · low precision	0.5% ±0.6 pp · low precision	0.2%	0.5%
Tagalog, including Filipino	8 ±13 · low precision	0.1% ±0.1 pp · low precision	0.2%	0.6%
Other Asian and Pacific Island	0 ±18 · low precision	0.0% ±0.2 pp · low precision	0.8%	1.1%
Arabic	0 ±18 · low precision	0.0% ±0.2 pp · low precision	1.8%	0.5%
Other and unspecified	16 ±26 · low precision	0.1% ±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: 8,234
Category	Count ± MOE	Share ± MOE (pp)	Michigan	U.S.
Less than high school graduate	246 ±116	3.0% ±1.4 pp	7.9%	10.4%
High school graduate or equivalency	1,414 ±286	17.2% ±3.4 pp	28.0%	26.0%
Some college, no degree	1,940 ±344	23.6% ±4.1 pp	21.9%	19.1%
Associate’s degree	749 ±170	9.1% ±2.0 pp	9.8%	8.8%
Bachelor’s degree	2,348 ±273	28.5% ±3.1 pp	19.7%	21.6%
Graduate or professional degree	1,537 ±419	18.7% ±5.0 pp	12.7%	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: 11,861
Category	Count ± MOE	Share ± MOE (pp)	Michigan	U.S.
Same house	10,763 ±304	90.7% ±2.5 pp	88.8%	87.7%
Moved within same county	289 ±128	2.4% ±1.1 pp	5.9%	6.3%
Moved from a different county in the same state	709 ±248	6.0% ±2.1 pp	3.4%	3.1%
Moved from a different state	74 ±84 · low precision	0.6% ±0.7 pp · low precision	1.4%	2.3%
Moved from abroad	26 ±42 · low precision	0.2% ±0.4 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

2.5% of South Lyon residents (±1.3 percentage points) had no health insurance coverage when surveyed, compared with 4.9% in Michigan and 8.4% nationally. 94.1% 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	South Lyon	Michigan	U.S.	Compared with Michigan
People without health insurance Civilian noninstitutionalized population	2.5% ±1.3 pp	4.9%	8.4%	Lower
Households with a broadband subscription Households	94.1% ±2.3 pp	90.5%	91.0%	Higher
Veterans Civilian population age 18 and older	3.9% ±1.2 pp	5.8%	6.2%	Lower

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 South Lyon . 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 South Lyon housing and cost context or return to the city profile.