Round Hill: Demographics & People
678 people call Round Hill home, in 267 households. Population grew 8.0% from 628 (2022) to 678 (2024). Median age 41.6 years. (3.4y older than Loudoun County; 3.8y older than Virginia). Children under 18 are 24% of the population. Population is 84% White (non-Hispanic) and 14% Hispanic or Latino. The community is somewhat diverse (Simpson index 0.21). 60% of households are family-led. County is losing 1,912 residents per year (2022-2023). County health: 29% adult obesity, 9% smoke.
- 2.5 people per household (vs Virginia avg 2.6).
- 40% non-family households (singles, roommates) (vs Virginia 35%).
- 65 dependents per 100 working-age (youth + seniors / 18-64) (vs Virginia 62).
Population & Trend
Population grew 8.0% from 628 (2022) to 678 (2024) — about 13.3× the recent U.S. annual rate of ~0.6%/yr. Estimated 2026 population: ~733 (extrapolated at 4.0%/yr trend). Census Bureau Vintage estimate: 810.
| Census data vintage | 2024 |
|---|---|
| Population | 420,959 people |
| Annual growth rate · Population change | 8.0% |
| Annual growth rate · Population (2022) | 628 |
| Annual growth rate · Population (2024) | 678 |
| Annual growth rate · Population growing | Yes |
| Annual growth rate · Trend category | booming |
| Population | 678 people (vs Virginia 42,214) |
| Population Estimate | 810 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 41.6y is 2.7 years older than the U.S. median (38.9y). Children under 18 make up 24% — above the U.S. share of ~22%.
| Age Summary · Median age | 41.6 years (vs Virginia 37.8y) |
|---|---|
| Age Summary · Children Pct | 24.3% |
| Age Summary · Character | established |
| Age Summary · Total Pop | 678 |
| Age Summary · Under 18 | 165 |
| Age Summary · 18 To 34 | 94.0× |
| Age Summary · 35 To 64 | 316.0× |
| Age Summary · 65 Plus | 103 |
| Population under 18 | 165 |
| Median age | 41.6 years (vs Virginia 37.8y) |
Sources: Census ACS 5-Year 2024 — place-level B01001 query · Census ACS 5-Year 2023 · Refreshed 2026-04-29
Race, Ethnicity & Diversity
Of 678 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.21 (0 = single group, 1 = perfectly even distribution); this is read as somewhat diverse.
| White residents | 569 |
|---|---|
| Black residents | 10 |
| Asian residents | 3 |
| Hispanic or Latino residents | 64 |
| Diversity Index · Diversity index (Simpson) | 21.4% |
| Diversity Index · Diversity label | somewhat diverse |
| Diversity Index · Groups counted | 4 |
| Diversity Index · Largest group share | 88.1% |
| Asian population | 0.3% (vs Virginia 5.6%) |
| Black population | 1.3% (vs Virginia 18.2%) |
| Hispanic or Latino population | 13.6% (vs Virginia 10.1%) |
| White (non-Hispanic) population | 83.6% (vs Virginia 53.8%) |
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). 2.5% are foreign-born — below the U.S. average of 13.9%. 3% have naturalized to U.S. citizenship.
| Residents born in this state | 373 |
|---|---|
| Residents born in another state | 269 |
| Share born in this state | 55.0% |
| Share born in another state | 45.0% |
| Native-born U.S. citizens | 39.7% |
| Foreign-born residents | 2.5% |
| Naturalized citizens | 2.8% |
| Total foreign-born residents | 24 |
| From Europe | 10 |
| From Africa | 4 |
Households & Family Composition
267 households. Averaging 2.4 people each — smaller than the U.S. average of 2.5. 60% are family households — below the U.S. share of ~65%. Of 147 families, 41% are married couples with children.
| Children under 18 | 135 |
|---|---|
| Total families | 147 |
| Married couples with children | 61 |
| Average household size | 2.38 |
| Women who gave birth (past year) | 11.3% |
| Grandparents living with grandchildren | 1 |
| Family households | 161 households (vs Virginia 9,367) |
| Households that are families | 60.3% (vs Virginia 65.0%) |
| Total households | 267 households (vs Virginia 14,324) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 11.5% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 1,912 residents per year on net (IRS migration data).
| Moved within the county (past year) | 11.5% |
|---|---|
| Migration · People moving in (annual) | 459,164 |
| Migration · People moving out (annual) | 461,076 |
| Migration · Net migration (in − out) | -1,912 |
| 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 | 38 |
|---|---|
| Disability rate | 5.7% |
Other
| Congressional District · District | 10 |
|---|---|
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 51107 |
| Cdc Birth Rate · State Fips | 51 |
| Cdc Birth Rate · County Fips | 107 |
| Cdc Birth Rate · County | Loudoun |
| Cdc Birth Rate · Birth Rate | 4.4% |
| Cdc Birth Rate · Lower Ci | 3.90 |
| Cdc Birth Rate · Upper Ci | 4.90 |
| Cdc Mortality · Fips | 51107 |
| Cdc Mortality · County | Loudoun County |
| Cdc Mortality · Urban Rural | Large fringe metro |
| Cdc Mortality · Total Deaths 2020 2023 | 6,646 |
| Cdc Vaccination · Fips | 51107 |
| Cdc Vaccination · County | Loudoun County |
| Cdc Vaccination · Dose1 Pop Pct | 94.7% |
| Cdc Vaccination · Series Complete Pct | 76.8% |
| Cdc Vaccination · Booster Pct | 48.2% |
| Cdc Vaccination · Population 2019 | 413,538 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 2.10 |
| Family Score · Schools | 1 |
| Family Score · Childcare Centers | 2 |
| Family Score · Children Pct | 24.3% |
| Family Score · Rating | limited |
| Town Summary · Key Facts | population 678, booming, established, affluent, white collar |
| Town Summary · Population | 678 people (vs Virginia 42,214) |
| Town Summary · County | Loudoun County |
Sources: NCES school congressional district assignment · federal dataset cascade