What are the fastest-growing counties in Hawaii?
Hawaii County is the fastest-growing county in Hawaii: its population grew 0.91% a year from 2020 to 2025, to 210,043 residents (Census PEP Vintage 2025). Kauai County (0.05%) and Honolulu County (-0.47%) follow. Hawaii as a whole grew -0.25% a year to 1,432,820 residents.
Data as of 2026-09-23. Population, growth and migration: PEP Vintage 2025 · 2020–2025. Income migration: IRS SOI 2022–2023 (2-yr lag).
Top 4 counties in Hawaii by population growth, 2020 to 2025
| Rank | County | Population | Growth (% per year) | Net domestic migration | Net international migration | IRS net AGI migration |
|---|---|---|---|---|---|---|
| 1 | Hawaii County | 210,043 | 0.91% | +6,077 | +3,278 | +$117.7M |
| 2 | Kauai County | 73,400 | 0.05% | -1,212 | +917 | +$7.9M |
| 3 | Honolulu County | 988,703 | -0.47% | -51,549 | +17,579 | -$102.9M |
| 4 | Maui County | 160,592 | -0.51% | -7,854 | +2,582 | -$26.0M |
Where are people moving in Hawaii?
Hawaii County gained the most people from elsewhere in the United States: net domestic migration of +6,077 from 2020 to 2025 (Census PEP Vintage 2025). The table ranks every Hawaii place with 10,000 or more residents by that figure; the IRS column shows net adjusted gross income migration for 2022 to 2023.
| Rank | County | Population | Growth (% per year) | Net domestic migration | Net international migration | IRS net AGI migration |
|---|---|---|---|---|---|---|
| 1 | Hawaii County | 210,043 | 0.91% | +6,077 | +3,278 | +$117.7M |
| 2 | Kauai County | 73,400 | 0.05% | -1,212 | +917 | +$7.9M |
| 3 | Maui County | 160,592 | -0.51% | -7,854 | +2,582 | -$26.0M |
| 4 | Honolulu County | 988,703 | -0.47% | -51,549 | +17,579 | -$102.9M |
Go past the headline numbers
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Get the Demographics Report for Hawaii CountyFrequently asked questions
- What are the fastest-growing counties in Hawaii?
- By population growth from 2020 to 2025, the fastest are Hawaii County (0.91% a year), Kauai County (0.05% a year), Honolulu County (-0.47% a year) and Maui County (-0.51% a year) (Census PEP Vintage 2025). Only places with 10,000 or more residents are ranked.
- Where are people moving in Hawaii?
- By net domestic migration from 2020 to 2025, the largest gains are Hawaii County (+6,077), Kauai County (-1,212) and Maui County (-7,854) (Census PEP Vintage 2025).
- How fast is Hawaii growing overall?
- Hawaii grew -0.25% a year from 2020 to 2025, to 1,432,820 residents, with net migration of -30,181 people (Census PEP Vintage 2025).
- Where does this Hawaii data come from, and how current is it?
- Population, growth and migration come from the U.S. Census Bureau Population Estimates Program (PEP Vintage 2025 · 2020–2025). Income migration comes from IRS Statistics of Income (IRS SOI 2022–2023 (2-yr lag)). Counties with fewer than 10,000 residents are not ranked (1 of 5 in Hawaii). Data last loaded 2026-09-23.
Data as of 2026-09-23: sources and periods
- Population, growth and migration
- U.S. Census Bureau, Population Estimates Program: PEP Vintage 2025 · 2020–2025. census.gov/programs-surveys/popest
- Income migration (net AGI)
- Internal Revenue Service, Statistics of Income migration data: IRS SOI 2022–2023 (2-yr lag). irs.gov/statistics/soi-tax-stats-migration-data
How to read the table
- Population is the Census July 1 estimate of the latest vintage.
- Growth is the compound annual rate over 2020 to 2025.
- Net domestic and international migration are cumulative people over 2020 to 2025.
- IRS net AGI migration is adjusted gross income that moved in, less what moved out, for 2022 to 2023. A plus sign means a net inflow.
- Places with fewer than 10,000 residents are left out of the rankings.