Market insights · California
Marin County, CA: growth, migration and housing
Marin County has 253,694 residents, down 2.9% since 2020 (-0.8% in the last year). In 2022–2023, 5,986 households moved in and 6,932 moved out (-946 net), bringing in a net $246.4M of income. Median household income is $149,091, the median home $1,507,300 and median rent $2,668 a month.
In California: 42nd of 58 counties for 5-year population growth · 42nd of 58 counties for net in-migration (per resident) · 3rd of 58 counties for median household income · 2nd of 58 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to Marin County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| San Francisco County, CA | 1,364 | $550.5M |
| Sonoma County, CA | 551 | $57.0M |
| Alameda County, CA | 424 | $94.4M |
| Contra Costa County, CA | 324 | $45.7M |
| Los Angeles County, CA | 293 | $72.9M |
| San Mateo County, CA | 263 | $67.3M |
| Santa Clara County, CA | 165 | $47.9M |
| San Diego County, CA | 129 | $18.8M |
Where leavers went
Top counties by households leaving Marin County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Sonoma County, CA | 1,105 | $142.6M |
| San Francisco County, CA | 786 | $187.4M |
| Alameda County, CA | 355 | $45.7M |
| Contra Costa County, CA | 354 | $73.4M |
| Los Angeles County, CA | 301 | $51.3M |
| Solano County, CA | 209 | $16.2M |
| San Mateo County, CA | 182 | $40.2M |
| San Diego County, CA | 180 | $31.2M |
BizyFi in Marin County
53 companies in the BizyFi directory are based here. Search them on the company map (company names with a free account), or browse California companies.
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Sources: U.S. Census Bureau population estimates (vintage 2025), American Community Survey 5-year (2024), and IRS Statistics of Income county-to-county migration data (2022–2023). Migration counts are tax returns (roughly households) moving between U.S. counties; the IRS suppresses very small flows. Growth rates, per-1,000 figures, rent share and state ranks are BizyFi calculations. Data updated 2026-10-17. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.