Island Lake: Demographics & People
About 8,014 people live in Island Lake, in 2,905 households. Population shrank 0.1% from 8,023 (2022) to 8,014 (2024). Median age 39.1 years. (1.6y younger than McHenry County; 1.4y older than Illinois). Children under 18 are 23% of the population. Population is 77% White (non-Hispanic) and 18% Hispanic or Latino. The community is somewhat diverse (Simpson index 0.36). 70% of households are family-led. County is losing 10,629 residents per year (2022-2023). County health: 32% adult obesity, 13% smoke.
- 2.8 people per household (vs Illinois avg 2.5).
- 30% non-family households (singles, roommates) (vs Illinois 38%).
- 59 dependents per 100 working-age (youth + seniors / 18-64) (vs Illinois 64).
Population & Trend
Population shrank 0.1% from 8,023 (2022) to 8,014 (2024). Estimated 2026 population: ~8,005 (extrapolated at -0.1%/yr trend).
| Census data vintage | 2024 |
|---|---|
| Population | 714,342 people |
| Annual growth rate · Population change | -0.1% |
| Annual growth rate · Population (2022) | 8,023 |
| Annual growth rate · Population (2024) | 8,014 |
| Annual growth rate · Trend category | stable |
| Population | 8,014 people (vs Illinois 39,460) |
| Population Estimate | 7,993 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 39.1y is 0.2 years older than the U.S. median (38.9y). Children under 18 make up 23% — above the U.S. share of ~22%.
| Age Summary · Median age | 39.1 years (vs Illinois 37.7y) |
|---|---|
| Age Summary · Children Pct | 23.3% |
| Age Summary · Character | family-oriented |
| Age Summary · Total Pop | 8,014 |
| Age Summary · Under 18 | 1,867 |
| Age Summary · 18 To 34 | 1,595.0× |
| Age Summary · 35 To 64 | 3,441.0× |
| Age Summary · 65 Plus | 1,111 |
| Population under 18 | 1,867 |
| Median age | 39.1 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 8,014 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.36 (0 = single group, 1 = perfectly even distribution); this is read as somewhat diverse.
| White residents | 6,750 |
|---|---|
| Black residents | 21 |
| Asian residents | 218 |
| Hispanic or Latino residents | 1,685 |
| Diversity Index · Diversity index (Simpson) | 35.6% |
| Diversity Index · Diversity label | somewhat diverse |
| Diversity Index · Groups counted | 4 |
| Diversity Index · Largest group share | 77.8% |
| Asian population | 2.4% (vs Illinois 6.1%) |
| Black population | 0.3% (vs Illinois 9.3%) |
| Hispanic or Latino population | 18.1% (vs Illinois 17.6%) |
| White (non-Hispanic) population | 77.1% (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). 0.6% are foreign-born — below the U.S. average of 13.9%. 12% have naturalized to U.S. citizenship.
| Residents born in this state | 5,774 |
|---|---|
| Residents born in another state | 1,198 |
| Share born in this state | 72.0% |
| Share born in another state | 28.0% |
| Native-born U.S. citizens | 14.9% |
| Foreign-born residents | 0.6% |
| Naturalized citizens | 12.4% |
| Total foreign-born residents | 1,162 |
| From Europe | 314 |
| From Africa | 195 |
| From Latin America | 32 |
Households & Family Composition
2,905 households. Averaging 2.8 people each — larger than the U.S. average of 2.5. 70% are family households — above the U.S. share of ~65%. Of 1,978 families, 36% are married couples with children.
| Children under 18 | 1,775 |
|---|---|
| Total families | 1,978 |
| Married couples with children | 717 |
| Single-parent households | 97 |
| Average household size | 2.75 |
| Women who gave birth (past year) | 15.2% |
| Grandparents living with grandchildren | 55 |
| Grandparents responsible for grandchildren | 25 |
| Family households | 2,041 households (vs Illinois 9,709) |
| Households that are families | 70.3% (vs Illinois 62.4%) |
| Total households | 2,905 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. 4.1% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 10,629 residents per year on net (IRS migration data).
| Moved within the county (past year) | 4.1% |
|---|---|
| Migration · People moving in (annual) | 673,084 |
| Migration · People moving out (annual) | 683,713 |
| Migration · Net migration (in − out) | -10,629 |
| 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 | 391 |
|---|---|
| Disability rate | 4.9% |
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. 56 residents live in group quarters (0.7% of population).
| Living in group quarters | 56 |
|---|
Other
| Congressional District · District | 14 |
|---|---|
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 17097 |
| Cdc Birth Rate · State Fips | 17 |
| Cdc Birth Rate · County Fips | 097 |
| Cdc Birth Rate · County | Lake |
| Cdc Birth Rate · Birth Rate | 9.8% |
| Cdc Birth Rate · Lower Ci | 9.20 |
| Cdc Birth Rate · Upper Ci | 10.50 |
| Cdc Mortality · Fips | 17097 |
| Cdc Mortality · County | Lake County |
| Cdc Mortality · Urban Rural | Large fringe metro |
| Cdc Mortality · Total Deaths 2020 2023 | 20,260 |
| Cdc Vaccination · Fips | 17097 |
| Cdc Vaccination · County | Lake County |
| Cdc Vaccination · Dose1 Pop Pct | 92.9% |
| Cdc Vaccination · Series Complete Pct | 83.5% |
| Cdc Vaccination · Booster Pct | 56.8% |
| Cdc Vaccination · Population 2019 | 696,535 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 2.90 |
| Family Score · Schools | 2 |
| Family Score · Childcare Centers | 3 |
| Family Score · Children Pct | 23.3% |
| Family Score · Rating | limited |
| Town Summary · Key Facts | population 8,014, stable, family-oriented, affluent, mixed |
| Town Summary · Population | 8,014 people (vs Illinois 39,460) |
| Town Summary · County | Lake County |
Sources: NCES school congressional district assignment · federal dataset cascade