St. Johnsville: Demographics & People
1,790 people call St. Johnsville home, in 651 households. Population shrank 4.9% from 1,882 (2022) to 1,790 (2024). Median age 36.0 years. (4.3y younger than Montgomery County; 4.4y younger than New York). Children under 18 are 25% of the population. Population is 88% White (non-Hispanic) and 7% Hispanic or Latino. 54% of households are family-led. County is gaining 68 residents per year (2022-2023). County health: 36% adult obesity, 19% smoke.
- 2.7 people per household.
- 46% non-family households (singles, roommates).
Population & Trend
Population shrank 4.9% from 1,882 (2022) to 1,790 (2024). Estimated 2026 population: ~1,703 (extrapolated at -2.4%/yr trend). Census Bureau Vintage estimate: 1,592.
| Census data vintage | 2024 |
|---|---|
| Population | 49,532 people |
| Annual growth rate · Population change | -4.9% |
| Annual growth rate · Population (2022) | 1,882 |
| Annual growth rate · Population (2024) | 1,790 |
| Annual growth rate · Trend category | declining |
| Population | 1,790 people |
| Population Estimate | 1,592 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 36.0y is 2.9 years younger than the U.S. median (38.9y). Children under 18 make up 25% — above the U.S. share of ~22%.
| Age Summary · Median age | 36.0 years (vs New York 40.4y) |
|---|---|
| Age Summary · Children Pct | 24.9% |
| Age Summary · Character | family-oriented |
| Population under 18 | 446 |
| Median age | 36.0 years (vs New York 40.4y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 1,790 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups).
| White residents | 1,701 |
|---|---|
| Hispanic or Latino residents | 111 |
| Diversity Index · Simpson Index | 9.3% |
| Diversity Index · Interpretation | less diverse |
| Hispanic or Latino population | 7.0% |
| White (non-Hispanic) population | 88.4% |
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%. 0% have naturalized to U.S. citizenship.
| Residents born in this state | 1,578 |
|---|---|
| Residents born in another state | 197 |
| Share born in this state | 88.2% |
| Share born in another state | 11.8% |
| Native-born U.S. citizens | 11.0% |
| Foreign-born residents | 0.7% |
| Naturalized citizens | 0.2% |
| Total foreign-born residents | 13 |
| From Europe | 6 |
| From Africa | 3 |
Households & Family Composition
651 households. Averaging 2.8 people each — larger than the U.S. average of 2.5. 54% are family households — below the U.S. share of ~65%. Of 359 families, 19% are married couples with children.
| Children under 18 | 513 |
|---|---|
| Total families | 359 |
| Married couples with children | 69 |
| Single-parent households | 10 |
| Average household size | 2.76 |
| Women who gave birth (past year) | 20.7% |
| Grandparents living with grandchildren | 41 |
| Grandparents responsible for grandchildren | 18 |
| Family households | 352 households |
| Households that are families | 54.1% |
| Total households | 651 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. 8.8% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is gaining 68 residents per year on net (IRS migration data).
| Moved within the county (past year) | 8.8% |
|---|---|
| Migration · People moving in (annual) | 43,783 |
| Migration · People moving out (annual) | 43,715 |
| Migration · Net migration (in − out) | 68 |
| 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 | 154 |
|---|---|
| Disability rate | 9.3% |
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. 112 residents live in group quarters (6.3% of population).
| Living in group quarters | 112 |
|---|
Other
| Congressional District · District | 21 |
|---|---|
| Congressional District · Formatted | NY-21 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 36,057 |
| Cdc Birth Rate · State Fips | 36 |
| Cdc Birth Rate · County Fips | 57 |
| Cdc Birth Rate · County | Montgomery |
| Cdc Birth Rate · Birth Rate | 25.3% |
| Cdc Birth Rate · Lower Ci | 21.60 |
| Cdc Birth Rate · Upper Ci | 29.50 |
| Cdc Mortality · Fips | 36,057 |
| Cdc Mortality · County | Montgomery County |
| Cdc Mortality · Urban Rural | Micropolitan |
| Cdc Mortality · Total Deaths 2020 2023 | 2,321 |
| Cdc Vaccination · Fips | 36,057 |
| Cdc Vaccination · County | Montgomery County |
| Cdc Vaccination · Dose1 Pop Pct | 75.7% |
| Cdc Vaccination · Series Complete Pct | 69.1% |
| Cdc Vaccination · Booster Pct | 57.6% |
| Cdc Vaccination · Population 2019 | 49,221 |
| Cdc Vaccination · Metro Status | Non-metro |
| Family Score · Score | 9.10 |
| Family Score · Schools | 15 |
| Family Score · Childcare Centers | 2 |
| Family Score · Children Pct | 24.9% |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 1,790, declining, family-oriented, working-class, mixed |
| Town Summary · Population | 1,790 people |
| Town Summary · County | Montgomery County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade