Round Rock: Demographics & People
About 127,786 people live in Round Rock, in 48,647 households. Population grew 2.8% from 124,288 (2022) to 127,786 (2024). Median age 36.2 years. (1.1y younger than Williamson County; 1.7y older than Texas). Children under 18 are 24% of the population. Population is 46% White (non-Hispanic) and 30% Hispanic or Latino. 67% of households are family-led. County is losing 27,460 residents per year (2022-2023). County health: 29% adult obesity, 12% smoke.
- 2.6 people per household (vs Texas avg 2.7).
- 33% non-family households (singles, roommates) (vs Texas 35%).
- 53 dependents per 100 working-age (youth + seniors / 18-64) (vs Texas 62).
Population & Trend
Population grew 2.8% from 124,288 (2022) to 127,786 (2024) — about 4.7× the recent U.S. annual rate of ~0.6%/yr. Estimated 2026 population: ~131,402 (extrapolated at 1.4%/yr trend). Census Bureau Vintage estimate: 136,316.
| Census data vintage | 2024 |
|---|---|
| Population | 1,290,188 people |
| Annual growth rate · Population change | 2.8% |
| Annual growth rate · Population (2022) | 124,288 |
| Annual growth rate · Population (2024) | 127,786 |
| Annual growth rate · Population growing | Yes |
| Annual growth rate · Trend category | growing |
| Population | 127,786 people (vs Texas 143,570) |
| Population Estimate | 136,316 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 36.2y is 2.7 years younger than the U.S. median (38.9y). Children under 18 make up 24% — above the U.S. share of ~22%.
| Age Summary · Median age | 36.2 years (vs Texas 34.5y) |
|---|---|
| Age Summary · Children Pct | 23.5% |
| Age Summary · Character | family-oriented |
| Age Summary · Total Pop | 127,786 |
| Age Summary · Under 18 | 30,093 |
| Age Summary · 18 To 34 | 31,464.0× |
| Age Summary · 35 To 64 | 51,929.0× |
| Age Summary · 65 Plus | 14,300 |
| Population under 18 | 30,093 |
| Median age | 36.2 years (vs Texas 34.5y) |
Sources: Census ACS 5-Year 2024 — place-level B01001 query · Census ACS 5-Year 2023 · Refreshed 2026-04-29
Race, Ethnicity & Diversity
Of 127,786 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups).
| White residents | 72,476 |
|---|---|
| Black residents | 13,905 |
| Asian residents | 9,076 |
| Hispanic or Latino residents | 36,199 |
| Diversity Index · Simpson Index | 58.1% |
| Diversity Index · Interpretation | moderately diverse |
| Asian population | 8.1% (vs Texas 3.7%) |
| Black population | 11.0% (vs Texas 9.2%) |
| Hispanic or Latino population | 29.7% (vs Texas 36.6%) |
| White (non-Hispanic) population | 45.9% (vs Texas 36.1%) |
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). 1.8% are foreign-born — below the U.S. average of 13.9%. 17% have naturalized to U.S. citizenship.
| Residents born in this state | 61,233 |
|---|---|
| Residents born in another state | 42,502 |
| Share born in this state | 47.9% |
| Share born in another state | 52.1% |
| Native-born U.S. citizens | 33.3% |
| Foreign-born residents | 1.8% |
| Naturalized citizens | 17.0% |
| Total foreign-born residents | 17,988 |
| From Europe | 1,327 |
| From Asia | 6 |
| From Africa | 6,766 |
| From Latin America | 313 |
| Census Foreign Born · Caribbean | 16 |
| Census Foreign Born · South America | 164 |
Households & Family Composition
48,647 households. Averaging 2.6 people each — larger than the U.S. average of 2.5. 67% are family households — above the U.S. share of ~65%. Of 31,944 families, 37% are married couples with children.
| Children under 18 | 30,337 |
|---|---|
| Total families | 31,944 |
| Married couples with children | 11,864 |
| Single-parent households | 1,034 |
| Average household size | 2.64 |
| Women who gave birth (past year) | 13.8% |
| Grandparents living with grandchildren | 1,638 |
| Grandparents responsible for grandchildren | 639 |
| Family households | 32,769 households (vs Texas 35,060) |
| Households that are families | 67.4% (vs Texas 65.3%) |
| Total households | 48,647 households (vs Texas 51,915) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 19.3% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 27,460 residents per year on net (IRS migration data).
| Moved within the county (past year) | 19.3% |
|---|---|
| Migration · People moving in (annual) | 1,168,290 |
| Migration · People moving out (annual) | 1,195,750 |
| Migration · Net migration (in − out) | -27,460 |
| 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 | 6,606 |
|---|---|
| Disability rate | 5.5% |
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. 844 residents live in group quarters (0.7% of population).
| Living in group quarters | 844 |
|---|
Other
| Congressional District · District | 17 |
|---|---|
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 48453 |
| Cdc Birth Rate · State Fips | 48 |
| Cdc Birth Rate · County Fips | 453 |
| Cdc Birth Rate · County | Travis |
| Cdc Birth Rate · Birth Rate | 18.9% |
| Cdc Birth Rate · Lower Ci | 18.10 |
| Cdc Birth Rate · Upper Ci | 19.70 |
| Cdc Mortality · Fips | 48453 |
| Cdc Mortality · County | Travis County |
| Cdc Mortality · Urban Rural | Large central metro |
| Cdc Mortality · Total Deaths 2020 2023 | 27,604 |
| Cdc Vaccination · Fips | 48453 |
| Cdc Vaccination · County | Travis County |
| Cdc Vaccination · Dose1 Pop Pct | 85.6% |
| Cdc Vaccination · Series Complete Pct | 72.6% |
| Cdc Vaccination · Booster Pct | 49.9% |
| Cdc Vaccination · Population 2019 | 1,273,954 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 10 |
| Family Score · Schools | 47 |
| Family Score · Childcare Centers | 69 |
| Family Score · Youth Sports Orgs | 5 |
| Family Score · Children Pct | 23.5% |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 127,786, growing, family-oriented, upper-middle, white collar |
| Town Summary · Population | 127,786 people (vs Texas 143,570) |
| Town Summary · County | Travis County |
Sources: NCES school congressional district assignment · federal dataset cascade