Lake Summerset: Demographics & People
Lake Summerset is home to 2,364 people, in 979 households. Population grew 5.5% from 2,240 (2022) to 2,364 (2024). Median age 45.1 years. (5.5y older than Winnebago County; 7.4y older than Illinois). Children under 18 are 20% of the population. Population is 93% White (non-Hispanic) and 5% Hispanic or Latino. The community is relatively homogeneous (Simpson index 0.11). 80% of households are family-led. County is gaining 55 residents per year (2022-2023). County health: 42% adult obesity, 18% smoke.
- 2.4 people per household (vs Illinois avg 2.5).
- 20% non-family households (singles, roommates) (vs Illinois 38%).
- 123 dependents per 100 working-age (youth + seniors / 18-64) (vs Illinois 64).
Population & Trend
Population grew 5.5% from 2,240 (2022) to 2,364 (2024) — about 9.2× the recent U.S. annual rate of ~0.6%/yr. Estimated 2026 population: ~2,496 (extrapolated at 2.8%/yr trend). Census Bureau Vintage estimate: 2,681.
| Census data vintage | 2024 |
|---|---|
| Population | 44,630 people |
| Annual growth rate · Population change | 5.5% |
| Annual growth rate · Population (2022) | 2,240 |
| Annual growth rate · Population (2024) | 2,364 |
| Annual growth rate · Population growing | Yes |
| Annual growth rate · Trend category | booming |
| Population | 2,364 people (vs Illinois 39,460) |
| Population Estimate | 2,681 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 45.1y is 6.2 years older than the U.S. median (38.9y). Children under 18 make up 20% — below the U.S. share of ~22%.
| Age Summary · Median age | 45.1 years (vs Illinois 37.7y) |
|---|---|
| Age Summary · Children Pct | 20.3% |
| Age Summary · Character | established |
| Age Summary · Total Pop | 2,364 |
| Age Summary · Under 18 | 479 |
| Age Summary · 18 To 34 | 361.0× |
| Age Summary · 35 To 64 | 699.0× |
| Age Summary · 65 Plus | 825 |
| Population under 18 | 479 |
| Median age | 45.1 years (vs Illinois 37.7y) |
Sources: Census ACS 5-Year 2024 — place-level B01001 query · Census ACS 5-Year 2023 · Refreshed 2026-04-29
Race, Ethnicity & Diversity
Of 2,364 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.11 (0 = single group, 1 = perfectly even distribution); this is read as relatively homogeneous.
| White residents | 2,210 |
|---|---|
| Black residents | 18 |
| Asian residents | 12 |
| Hispanic or Latino residents | 104 |
| Diversity Index · Diversity index (Simpson) | 10.9% |
| Diversity Index · Diversity label | relatively homogeneous |
| Diversity Index · Groups counted | 4 |
| Diversity Index · Largest group share | 94.3% |
| Asian population | 0.3% (vs Illinois 6.1%) |
| Black population | 1.0% (vs Illinois 9.3%) |
| Hispanic or Latino population | 4.9% (vs Illinois 17.6%) |
| White (non-Hispanic) population | 93.2% (vs Illinois 54.8%) |
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). 1.1% are foreign-born — below the U.S. average of 13.9%. 4% have naturalized to U.S. citizenship.
| Residents born in this state | 1,532 |
|---|---|
| Residents born in another state | 704 |
| Share born in this state | 64.8% |
| Share born in another state | 35.2% |
| Native-born U.S. citizens | 29.8% |
| Foreign-born residents | 1.1% |
| Naturalized citizens | 4.3% |
| Total foreign-born residents | 19 |
| From Europe | 15 |
| From Africa | 4 |
Households & Family Composition
979 households. Averaging 2.6 people each — matches the U.S. average of 2.5. 80% are family households — above the U.S. share of ~65%. Of 676 families, 22% are married couples with children.
| Children under 18 | 529 |
|---|---|
| Total families | 676 |
| Married couples with children | 149 |
| Average household size | 2.56 |
| Women who gave birth (past year) | 7.6% |
| Grandparents living with grandchildren | 9 |
| Family households | 779 households (vs Illinois 9,709) |
| Households that are families | 79.6% (vs Illinois 62.4%) |
| Total households | 979 households (vs Illinois 14,867) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 9.0% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is gaining 55 residents per year on net (IRS migration data).
| Moved within the county (past year) | 9.0% |
|---|---|
| Migration · People moving in (annual) | 40,222 |
| Migration · People moving out (annual) | 40,167 |
| Migration · Net migration (in − out) | 55 |
| 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 | 114 |
|---|---|
| Disability rate | 5.4% |
Other
| Congressional District · District | 16 |
|---|---|
| Congressional District · Formatted | IL-16 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 17177 |
| Cdc Birth Rate · State Fips | 17 |
| Cdc Birth Rate · County Fips | 177 |
| Cdc Birth Rate · County | Stephenson |
| Cdc Birth Rate · Birth Rate | 24.6% |
| Cdc Birth Rate · Lower Ci | 20.80 |
| Cdc Birth Rate · Upper Ci | 29.00 |
| Cdc Mortality · Fips | 17177 |
| Cdc Mortality · County | Stephenson County |
| Cdc Mortality · Urban Rural | Micropolitan |
| Cdc Mortality · Total Deaths 2020 2023 | 2,112 |
| Cdc Vaccination · Fips | 17177 |
| Cdc Vaccination · County | Stephenson County |
| Cdc Vaccination · Dose1 Pop Pct | 68.0% |
| Cdc Vaccination · Series Complete Pct | 62.7% |
| Cdc Vaccination · Booster Pct | 56.9% |
| Cdc Vaccination · Population 2019 | 44,498 |
| Cdc Vaccination · Metro Status | Non-metro |
| Family Score · Score | 10 |
| Family Score · Schools | 20 |
| Family Score · Children Pct | 20.3% |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 2,364, booming, established, affluent, mixed |
| Town Summary · Population | 2,364 people (vs Illinois 39,460) |
| Town Summary · County | Stephenson County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade