Mill Creek: Demographics & People
Mill Creek is home to 278 people, in 93 households. Population grew 12.1% from 248 (2022) to 278 (2024). Median age 46.1 years. (6.8y older than Johnston County; 10.9y older than Oklahoma). Children under 18 are 21% of the population. Population is 61% White (non-Hispanic) and 2% Black. The community is relatively homogeneous (Simpson index 0.14). 57% of households are family-led. County is losing 230 residents per year (2022-2023). County health: 44% adult obesity, 24% smoke.
- 3.0 people per household (vs Oklahoma avg 2.6).
- 43% non-family households (singles, roommates) (vs Oklahoma 39%).
- 73 dependents per 100 working-age (youth + seniors / 18-64) (vs Oklahoma 67).
Population & Trend
Population grew 12.1% from 248 (2022) to 278 (2024) — about 20.2× the recent U.S. annual rate of ~0.6%/yr. Estimated 2026 population: ~312 (extrapolated at 6.0%/yr trend). Census Bureau Vintage estimate: 362.
| Census data vintage | 2024 |
|---|---|
| Population | 10,272 people |
| Annual growth rate · Population change | 12.1% |
| Annual growth rate · Population (2022) | 248 |
| Annual growth rate · Population (2024) | 278 |
| Annual growth rate · Population growing | Yes |
| Annual growth rate · Trend category | booming |
| Population | 278 people (vs Oklahoma 63,420) |
| Population Estimate | 362 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 46.1y is 7.2 years older than the U.S. median (38.9y). Children under 18 make up 21% — near the U.S. share of ~22%.
| Age Summary · Median age | 46.1 years (vs Oklahoma 35.2y) |
|---|---|
| Age Summary · Children Pct | 21.2% |
| Age Summary · Character | established |
| Age Summary · Total Pop | 278 |
| Age Summary · Under 18 | 59 |
| Age Summary · 18 To 34 | 42.0× |
| Age Summary · 35 To 64 | 119.0× |
| Age Summary · 65 Plus | 58 |
| Population under 18 | 59 |
| Median age | 46.1 years (vs Oklahoma 35.2y) |
Sources: Census ACS 5-Year 2024 — place-level B01001 query · Census ACS 5-Year 2023 · Refreshed 2026-04-29
Race, Ethnicity & Diversity
Of 278 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.14 (0 = single group, 1 = perfectly even distribution); this is read as relatively homogeneous.
| White residents | 157 |
|---|---|
| Black residents | 3 |
| Hispanic or Latino residents | 10 |
| Diversity Index · Diversity index (Simpson) | 14.3% |
| Diversity Index · Diversity label | relatively homogeneous |
| Diversity Index · Groups counted | 3 |
| Diversity Index · Largest group share | 92.4% |
| Black population | 2.5% (vs Oklahoma 5.5%) |
| Hispanic or Latino population | 0.7% (vs Oklahoma 12.3%) |
| White (non-Hispanic) population | 61.2% (vs Oklahoma 57.8%) |
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). 0.7% are foreign-born — below the U.S. average of 13.9%.
| Residents born in this state | 175 |
|---|---|
| Residents born in another state | 101 |
| Share born in this state | 62.9% |
| Share born in another state | 37.1% |
| Native-born U.S. citizens | 36.3% |
| Foreign-born residents | 0.7% |
| Total foreign-born residents | 3 |
Households & Family Composition
93 households. Averaging 2.9 people each — larger than the U.S. average of 2.5. 57% are family households — below the U.S. share of ~65%. Of 52 families, 23% are married couples with children.
| Children under 18 | 54 |
|---|---|
| Total families | 52 |
| Married couples with children | 12 |
| Single-parent households | 1 |
| Average household size | 2.88 |
| Women who gave birth (past year) | 17.5% |
| Grandparents living with grandchildren | 8 |
| Grandparents responsible for grandchildren | 2 |
| Family households | 53 households (vs Oklahoma 16,590) |
| Households that are families | 57.0% (vs Oklahoma 61.1%) |
| Total households | 93 households (vs Oklahoma 23,671) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 3.2% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 230 residents per year on net (IRS migration data).
| Moved within the county (past year) | 3.2% |
|---|---|
| Migration · People moving in (annual) | 8,723 |
| Migration · People moving out (annual) | 8,953 |
| Migration · Net migration (in − out) | -230 |
| 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 | 31 |
|---|---|
| Disability rate | 11.8% |
Other
| Congressional District · District | 2 |
|---|---|
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 40069 |
| Cdc Birth Rate · State Fips | 40 |
| Cdc Birth Rate · County Fips | 069 |
| Cdc Birth Rate · County | Johnston |
| Cdc Birth Rate · Birth Rate | 28.9% |
| Cdc Birth Rate · Lower Ci | 22.20 |
| Cdc Birth Rate · Upper Ci | 36.90 |
| Cdc Mortality · Fips | 40069 |
| Cdc Mortality · County | Johnston County |
| Cdc Mortality · Urban Rural | Noncore |
| Cdc Mortality · Total Deaths 2020 2023 | 311 |
| Cdc Vaccination · Fips | 40069 |
| Cdc Vaccination · County | Johnston County |
| Cdc Vaccination · Dose1 Pop Pct | 53.3% |
| Cdc Vaccination · Series Complete Pct | 44.6% |
| Cdc Vaccination · Booster Pct | 40.7% |
| Cdc Vaccination · Population 2019 | 11,085 |
| Cdc Vaccination · Metro Status | Non-metro |
| Family Score · Score | 2.30 |
| Family Score · Schools | 2 |
| Family Score · Childcare Centers | 1 |
| Family Score · Children Pct | 21.2% |
| Family Score · Rating | limited |
| Town Summary · Key Facts | population 278, booming, established, working-class, mixed |
| Town Summary · Population | 278 people (vs Oklahoma 63,420) |
| Town Summary · County | Johnston County |
Sources: NCES school congressional district assignment · federal dataset cascade