St. Andrews: Demographics & People
St. Andrews is home to 19,868 people, in 10,127 households. Population shrank 5.2% from 20,953 (2022) to 19,868 (2024). Median age 33.2 years. (1.2y younger than Richland County; 7.3y younger than South Carolina). Children under 18 are 22% of the population. Population is 68% Black and 22% White (non-Hispanic). The community is moderately diverse (Simpson index 0.45). 43% of households are family-led. County is gaining 3,631 residents per year (2022-2023). County health: 34% adult obesity, 15% smoke.
- 2.0 people per household.
- 57% non-family households (singles, roommates).
Population & Trend
Population shrank 5.2% from 20,953 (2022) to 19,868 (2024). Estimated 2026 population: ~18,852 (extrapolated at -2.6%/yr trend). Census Bureau Vintage estimate: 17,548.
| Census data vintage | 2024 |
|---|---|
| Population | 416,147 people |
| Annual growth rate · Population change | -5.2% |
| Annual growth rate · Population (2022) | 20,953 |
| Annual growth rate · Population (2024) | 19,868 |
| Annual growth rate · Trend category | shrinking |
| Population | 19,868 people |
| Population Estimate | 17,548 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 33.2y is 5.7 years younger than the U.S. median (38.9y). Children under 18 make up 22% — near the U.S. share of ~22%.
| Age Summary · Median age | 33.2 years (vs South Carolina 40.5y) |
|---|---|
| Age Summary · Children Pct | 21.6% |
| Age Summary · Character | young professional |
| Population under 18 | 4,293 |
| Median age | 33.2 years (vs South Carolina 40.5y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 19,868 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.45 (0 = single group, 1 = perfectly even distribution); this is read as moderately diverse.
| White residents | 4,526 |
|---|---|
| Black residents | 14,283 |
| Asian residents | 527 |
| Hispanic or Latino residents | 839 |
| Diversity Index · Diversity index (Simpson) | 44.6% |
| Diversity Index · Diversity label | moderately diverse |
| Diversity Index · Groups counted | 4 |
| Diversity Index · Largest group share | 70.8% |
| Asian population | 2.2% |
| Black population | 68.5% |
| Hispanic or Latino population | 3.6% |
| White (non-Hispanic) population | 22.2% |
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). 1.7% are foreign-born — below the U.S. average of 13.9%. 7% have naturalized to U.S. citizenship.
| Residents born in this state | 11,316 |
|---|---|
| Residents born in another state | 6,806 |
| Share born in this state | 57.0% |
| Share born in another state | 43.0% |
| Native-born U.S. citizens | 34.3% |
| Foreign-born residents | 1.7% |
| Naturalized citizens | 7.1% |
| Total foreign-born residents | 1,653 |
| From Europe | 131 |
| From Africa | 549 |
| Census Foreign Born · Caribbean | 49 |
Households & Family Composition
10,127 households. Averaging 2.0 people each — smaller than the U.S. average of 2.5. 43% are family households — below the U.S. share of ~65%. Of 4,681 families, 19% are married couples with children.
| Children under 18 | 4,697 |
|---|---|
| Total families | 4,681 |
| Married couples with children | 879 |
| Single-parent households | 227 |
| Average household size | 2.05 |
| Women who gave birth (past year) | 19.2% |
| Grandparents living with grandchildren | 595 |
| Grandparents responsible for grandchildren | 194 |
| Family households | 4,369 households |
| Households that are families | 43.1% |
| Total households | 10,127 households |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 26.3% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is gaining 3,631 residents per year on net (IRS migration data).
| Moved within the county (past year) | 26.3% |
|---|---|
| Migration · People moving in (annual) | 363,362 |
| Migration · People moving out (annual) | 359,731 |
| Migration · Net migration (in − out) | 3,631 |
| 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 | 1,335 |
|---|---|
| Disability rate | 6.1% |
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. 70 residents live in group quarters (0.4% of population).
| Living in group quarters | 70 |
|---|
Other
| Congressional District · District | 6 |
|---|---|
| Congressional District · Formatted | SC-06 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 45,079 |
| Cdc Birth Rate · State Fips | 45 |
| Cdc Birth Rate · County Fips | 79 |
| Cdc Birth Rate · County | Richland |
| Cdc Birth Rate · Birth Rate | 13.8% |
| Cdc Birth Rate · Lower Ci | 12.90 |
| Cdc Birth Rate · Upper Ci | 14.80 |
| Cdc Mortality · Fips | 45,079 |
| Cdc Mortality · County | Richland County |
| Cdc Mortality · Urban Rural | Medium metro |
| Cdc Mortality · Total Deaths 2020 2023 | 15,932 |
| Cdc Vaccination · Fips | 45,079 |
| Cdc Vaccination · County | Richland County |
| Cdc Vaccination · Dose1 Pop Pct | 75.6% |
| Cdc Vaccination · Series Complete Pct | 64.6% |
| Cdc Vaccination · Booster Pct | 46.8% |
| Cdc Vaccination · Population 2019 | 415,759 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 4.50 |
| Family Score · Schools | 7 |
| Family Score · Children Pct | 21.6% |
| Family Score · Rating | fair |
| Town Summary · Key Facts | population 19,868, shrinking, young professional, working-class, mixed |
| Town Summary · Population | 19,868 people |
| Town Summary · County | Richland County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade