Grimes: Demographics & People
16,366 people call Grimes home, in 6,117 households. Population grew 3.5% from 15,810 (2022) to 16,366 (2024). Median age 35.4 years. (0.8y younger than Polk County; 1.9y younger than Iowa). Children under 18 are 28% of the population. Population is 82% White (non-Hispanic) and 6% Black. The community is somewhat diverse (Simpson index 0.23). 67% of households are family-led. County is gaining 5,143 residents per year (2022-2023). County health: 32% adult obesity, 11% smoke.
- 2.7 people per household (vs Iowa avg 2.4).
- 33% non-family households (singles, roommates) (vs Iowa 43%).
- 54 dependents per 100 working-age (youth + seniors / 18-64) (vs Iowa 70).
Population & Trend
Population grew 3.5% from 15,810 (2022) to 16,366 (2024) — about 5.9× the recent U.S. annual rate of ~0.6%/yr. Estimated 2026 population: ~16,947 (extrapolated at 1.8%/yr trend). Census Bureau Vintage estimate: 17,742.
| Census data vintage | 2024 |
|---|---|
| Population | 99,678 people |
| Annual growth rate · Population change | 3.5% |
| Annual growth rate · Population (2022) | 15,810 |
| Annual growth rate · Population (2024) | 16,366 |
| Annual growth rate · Population growing | Yes |
| Annual growth rate · Trend category | growing |
| Population | 16,366 people (vs Iowa 24,827) |
| Population Estimate | 17,742 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 35.4y is 3.5 years younger than the U.S. median (38.9y). Children under 18 make up 28% — above the U.S. share of ~22%.
| Age Summary · Median age | 35.4 years (vs Iowa 37.3y) |
|---|---|
| Age Summary · Children Pct | 27.5% |
| Age Summary · Character | family-oriented |
| Age Summary · Total Pop | 16,366 |
| Age Summary · Under 18 | 4,507 |
| Age Summary · 18 To 34 | 3,605.0× |
| Age Summary · 35 To 64 | 7,055.0× |
| Age Summary · 65 Plus | 1,199 |
| Population under 18 | 4,507 |
| Median age | 35.4 years (vs Iowa 37.3y) |
Sources: Census ACS 5-Year 2024 — place-level B01001 query · Census ACS 5-Year 2023 · Refreshed 2026-04-29
Race, Ethnicity & Diversity
Of 16,366 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.23 (0 = single group, 1 = perfectly even distribution); this is read as somewhat diverse.
| White residents | 13,894 |
|---|---|
| Black residents | 368 |
| Asian residents | 563 |
| Hispanic or Latino residents | 1,023 |
| Diversity Index · Diversity index (Simpson) | 22.5% |
| Diversity Index · Diversity label | somewhat diverse |
| Diversity Index · Groups counted | 4 |
| Diversity Index · Largest group share | 87.7% |
| Asian population | 4.6% (vs Iowa 1.9%) |
| Black population | 6.2% (vs Iowa 3.6%) |
| Hispanic or Latino population | 5.3% (vs Iowa 5.6%) |
| White (non-Hispanic) population | 81.6% (at Iowa median) |
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). 0.3% are foreign-born — below the U.S. average of 13.9%. 10% have naturalized to U.S. citizenship.
| Residents born in this state | 10,598 |
|---|---|
| Residents born in another state | 4,010 |
| Share born in this state | 64.8% |
| Share born in another state | 35.2% |
| Native-born U.S. citizens | 24.5% |
| Foreign-born residents | 0.3% |
| Naturalized citizens | 10.5% |
| Total foreign-born residents | 874 |
| From Europe | 425 |
| From Africa | 365 |
Households & Family Composition
6,117 households. Averaging 2.6 people each — matches the U.S. average of 2.5. 67% are family households — near the U.S. share of ~65%. Of 3,797 families, 49% are married couples with children.
| Children under 18 | 4,371 |
|---|---|
| Total families | 3,797 |
| Married couples with children | 1,847 |
| Single-parent households | 42 |
| Average household size | 2.57 |
| Women who gave birth (past year) | 17.1% |
| Grandparents living with grandchildren | 122 |
| Family households | 4,089 households (vs Iowa 6,171) |
| Households that are families | 66.8% (vs Iowa 57.4%) |
| Total households | 6,117 households (vs Iowa 10,135) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 9.5% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is gaining 5,143 residents per year on net (IRS migration data).
| Moved within the county (past year) | 9.5% |
|---|---|
| Migration · People moving in (annual) | 119,422 |
| Migration · People moving out (annual) | 114,279 |
| Migration · Net migration (in − out) | 5,143 |
| 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 | 757 |
|---|---|
| Disability rate | 4.9% |
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. 50 residents live in group quarters (0.3% of population).
| Living in group quarters | 50 |
|---|
Other
| Congressional District · District | 3 |
|---|---|
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 19049 |
| Cdc Birth Rate · State Fips | 19 |
| Cdc Birth Rate · County Fips | 049 |
| Cdc Birth Rate · County | Dallas |
| Cdc Birth Rate · Birth Rate | 7.8% |
| Cdc Birth Rate · Lower Ci | 6.40 |
| Cdc Birth Rate · Upper Ci | 9.40 |
| Cdc Mortality · Fips | 19049 |
| Cdc Mortality · County | Dallas County |
| Cdc Mortality · Urban Rural | Medium metro |
| Cdc Mortality · Total Deaths 2020 2023 | 1,598 |
| Cdc Vaccination · Fips | 19049 |
| Cdc Vaccination · County | Dallas County |
| Cdc Vaccination · Dose1 Pop Pct | 75.5% |
| Cdc Vaccination · Series Complete Pct | 69.7% |
| Cdc Vaccination · Booster Pct | 59.7% |
| Cdc Vaccination · Population 2019 | 93,453 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 6.00 |
| Family Score · Schools | 5 |
| Family Score · Childcare Centers | 5 |
| Family Score · Youth Sports Orgs | 2 |
| Family Score · Children Pct | 27.5% |
| Family Score · Rating | good |
| Town Summary · Key Facts | population 16,366, growing, family-oriented, affluent, white collar |
| Town Summary · Population | 16,366 people (vs Iowa 24,827) |
| Town Summary · County | Dallas County |
Sources: NCES school congressional district assignment · federal dataset cascade