Flat Rock: Demographics & People
About 10,340 people live in Flat Rock, in 3,924 households. Population shrank 0.8% from 10,418 (2022) to 10,340 (2024). Median age 39.3 years. (1.4y older than Wayne County; 1.6y older than Michigan). Children under 18 are 25% of the population. Population is 78% White (non-Hispanic) and 8% Black. 68% of households are family-led. County is gaining 405 residents per year (2022-2023). County health: 38% adult obesity, 18% smoke.
- 2.6 people per household (vs Michigan avg 2.4).
- 32% non-family households (singles, roommates) (vs Michigan 44%).
- 67 dependents per 100 working-age (youth + seniors / 18-64) (vs Michigan 66).
Population & Trend
Population shrank 0.8% from 10,418 (2022) to 10,340 (2024). Estimated 2026 population: ~10,262 (extrapolated at -0.4%/yr trend). Census Bureau Vintage estimate: 10,159.
| Census data vintage | 2024 |
|---|---|
| Population | 154,809 people |
| Annual growth rate · Population change | -0.8% |
| Annual growth rate · Population (2022) | 10,418 |
| Annual growth rate · Population (2024) | 10,340 |
| Annual growth rate · Trend category | stable |
| Population | 10,340 people (vs Michigan 45,758) |
| Population Estimate | 10,159 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 39.3y is 0.4 years older than the U.S. median (38.9y). Children under 18 make up 25% — above the U.S. share of ~22%.
| Age Summary · Median age | 39.3 years (vs Michigan 37.7y) |
|---|---|
| Age Summary · Children Pct | 24.7% |
| Age Summary · Character | family-oriented |
| Age Summary · Total Pop | 10,340 |
| Age Summary · Under 18 | 2,557 |
| Age Summary · 18 To 34 | 1,958.0× |
| Age Summary · 35 To 64 | 4,242.0× |
| Age Summary · 65 Plus | 1,583 |
| Population under 18 | 2,557 |
| Median age | 39.3 years (vs Michigan 37.7y) |
Sources: Census ACS 5-Year 2024 — place-level B01001 query · Census ACS 5-Year 2023 · Refreshed 2026-04-29
Race, Ethnicity & Diversity
Of 10,340 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups).
| White residents | 8,190 |
|---|---|
| Black residents | 672 |
| Asian residents | 25 |
| Hispanic or Latino residents | 1,048 |
| Diversity Index · Simpson Index | 35.7% |
| Diversity Index · Interpretation | less diverse |
| Asian population | 0.1% (vs Michigan 1.7%) |
| Black population | 8.0% (vs Michigan 7.5%) |
| Hispanic or Latino population | 7.4% (vs Michigan 5.2%) |
| White (non-Hispanic) population | 78.3% (vs Michigan 66.5%) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Ancestry
Self-reported ancestry from Census ACS — what residents report as their ethnic origin, separate from race. Counts can exceed population because people can list multiple ancestries.
Top (8)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS). 0.1% are foreign-born — below the U.S. average of 13.9%. 2% have naturalized to U.S. citizenship.
| Residents born in this state | 8,810 |
|---|---|
| Residents born in another state | 1,279 |
| Share born in this state | 85.2% |
| Share born in another state | 14.8% |
| Native-born U.S. citizens | 12.4% |
| Foreign-born residents | 0.1% |
| Naturalized citizens | 2.3% |
| Total foreign-born residents | 234 |
| From Europe | 112 |
| From Africa | 7 |
| From Latin America | 7 |
Households & Family Composition
3,924 households. Averaging 2.7 people each — larger than the U.S. average of 2.5. 68% are family households — above the U.S. share of ~65%. Of 2,744 families, 30% are married couples with children.
| Children under 18 | 2,693 |
|---|---|
| Total families | 2,744 |
| Married couples with children | 813 |
| Single-parent households | 66 |
| Average household size | 2.72 |
| Women who gave birth (past year) | 11.4% |
| Grandparents living with grandchildren | 169 |
| Grandparents responsible for grandchildren | 46 |
| Family households | 2,671 households (vs Michigan 10,723) |
| Households that are families | 68.1% (vs Michigan 56.3%) |
| Total households | 3,924 households (vs Michigan 18,535) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 2.9% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is gaining 405 residents per year on net (IRS migration data).
| Moved within the county (past year) | 2.9% |
|---|---|
| Migration · People moving in (annual) | 144,763 |
| Migration · People moving out (annual) | 144,358 |
| Migration · Net migration (in − out) | 405 |
| Migration · Population growing | Yes |
| Migration · Year | 2022-2023 |
Sources: IRS SOI Migration 2021-2022 · Refreshed 2026-04-12
Disability
Census ACS measures self-reported functional limitations — vision, hearing, mobility, cognitive, self-care, or independent-living. The U.S. baseline disability rate is about 12–13%; rates trend higher with median age.
| Residents with a disability | 630 |
|---|---|
| Disability rate | 6.0% |
Group Quarters
Group quarters are non-household living arrangements counted by the Census — college dormitories, nursing homes, military barracks, group homes, correctional facilities, and similar institutional or shared housing. 28 residents live in group quarters (0.3% of population).
| Living in group quarters | 28 |
|---|
Other
| Congressional District · District | 12 |
|---|---|
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 26115 |
| Cdc Birth Rate · State Fips | 26 |
| Cdc Birth Rate · County Fips | 115 |
| Cdc Birth Rate · County | Monroe |
| Cdc Birth Rate · Birth Rate | 15.1% |
| Cdc Birth Rate · Lower Ci | 13.40 |
| Cdc Birth Rate · Upper Ci | 17.00 |
| Cdc Mortality · Fips | 26115 |
| Cdc Mortality · County | Monroe County |
| Cdc Mortality · Urban Rural | Small metro |
| Cdc Mortality · Total Deaths 2020 2023 | 4,593 |
| Cdc Vaccination · Fips | 26115 |
| Cdc Vaccination · County | Monroe County |
| Cdc Vaccination · Dose1 Pop Pct | 64.3% |
| Cdc Vaccination · Series Complete Pct | 59.6% |
| Cdc Vaccination · Booster Pct | 49.3% |
| Cdc Vaccination · Population 2019 | 150,500 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 8.20 |
| Family Score · Schools | 12 |
| Family Score · Childcare Centers | 4 |
| Family Score · Children Pct | 24.7% |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 10,340, stable, family-oriented, upper-middle, mixed |
| Town Summary · Population | 10,340 people (vs Michigan 45,758) |
| Town Summary · County | Monroe County |
Sources: NCES school congressional district assignment · federal dataset cascade