Boise CityDemographics & People
Boise City's population stands at 237,242 people, in 101,178 households. Population grew 0.7% from 235,701 (2022) to 237,242 (2024). Median age 38.6 years. (1.5y older than Idaho). Children under 18 are 18% of the population. Population is 80% White (non-Hispanic) and 10% Hispanic or Latino. The community is somewhat diverse (Simpson index 0.26). 57% of households are family-led. County is gaining 11,575 residents per year (2022-2023). County health: 29% adult obesity, 12% smoke.
- 2.3 people per household (vs Idaho avg 2.7).
- 43% non-family households (singles, roommates) (vs Idaho 33%).
- 53 dependents per 100 working-age (youth + seniors / 18-64) (vs Idaho 70).
Population & Trend
Population grew 0.7% from 235,701 (2022) to 237,242 (2024) — close to the U.S. annual rate of ~0.6%/yr. Estimated 2026 population: ~238,786 (extrapolated at 0.3%/yr trend). Census Bureau Vintage estimate: 240,846.
| Census data vintage | 2024 |
|---|---|
| County Population | 494,967 people |
| Annual growth rate · Population change | 65.0% |
| Annual growth rate · Population (2022) | 235,701 |
| Annual growth rate · Population (2024) | 237,242 |
| Annual growth rate · Population growing | Yes |
| Annual growth rate · Trend category | stable |
| Population | 237,242 people (vs Idaho 56,447) |
| Population Estimate | 240,846 |
Sources: U.S. Census Bureau, ACS 5-Year · U.S. Census Bureau, ACS 5-Year DP05 · U.S. Census Bureau, Vintage Population Estimates · Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 38.6y is 0.3 years younger than the U.S. median (38.9y). Children under 18 make up 18% — below the U.S. share of ~22%.
| Age Summary · Median age | 38.6 years (vs Idaho 36.1y) |
|---|---|
| Age Summary · Children Pct | 18.5% |
| Age Summary · Character | family-oriented |
| Age Summary · Total Pop | 237,242 |
| Age Summary · Under 18 | 43,866 |
| Age Summary · 18 To 34 | 61,999 |
| Age Summary · 35 To 64 | 92,872 |
| Age Summary · 65 Plus | 38,505 |
| Median age | 38.6 years (vs Idaho 36.1y) |
Sources: Census ACS 5-Year 2024 — place-level B01001 query · Census ACS 5-Year 2023 · Refreshed 2026-04-29
Race, Ethnicity & Diversity
Of 237,242 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.26 (0 = single group, 1 = perfectly even distribution); this is read as somewhat diverse.
| Diversity Index · Diversity index (Simpson) | 25.9% |
|---|---|
| Diversity Index · Diversity label | somewhat diverse |
| Diversity Index · Groups counted | 4 |
| Diversity Index · Largest group share | 85.5% |
| Asian population | 3.7% (vs Idaho 1.1%) |
| Black population | 1.6% (vs Idaho 0.7%) |
| Hispanic or Latino population | 9.6% (vs Idaho 10.5%) |
| White (non-Hispanic) population | 79.5% (at Idaho median) |
Sources: U.S. Census Bureau, ACS 5-Year DP05 · 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)
Sources: Census ACS 2022 B04006+B03001+B02001
Households & Family Composition
101,178 households. Averaging 2.3 people each — smaller than the U.S. average of 2.5. 57% are family households — below the U.S. share of ~65%. Of 57,844 families, 30% are married couples with children.
| Family households | 57,993 households (vs Idaho 13,756) |
|---|---|
| Households that are families | 57.3% (vs Idaho 66.6%) |
| Total households | 101,178 households (vs Idaho 21,573) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 18.1% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is gaining 11,575 residents per year on net (IRS migration data).
| Migration · People moving in (annual) | 503,543 |
|---|---|
| Migration · People moving out (annual) | 491,968 |
| Migration · Net migration (in − out) | 11,575 |
| Migration · Population growing | Yes |
Sources: IRS SOI Migration 2021-2022 · Refreshed 2026-04-12
Other
| County Cdc Birth Rate · Fips | 16001 |
|---|---|
| County Cdc Birth Rate · State Fips | 16 |
| County Cdc Birth Rate · County Fips | 001 |
| County Cdc Birth Rate · County | Ada |
| County Cdc Birth Rate · Birth Rate | 8.9 per 1,000 |
| County Cdc Birth Rate · Lower Ci | 8.10 |
| County Cdc Birth Rate · Upper Ci | 9.70 |
| County Cdc Mortality · Fips | 16001 |
| County Cdc Mortality · County | Ada County |
| County Cdc Mortality · Urban Rural | Medium metro |
| County Cdc Mortality · Total Deaths 2020 2023 | 16,194 |
Sources: CDC NCHS Vital Statistics · CDC WONDER