Market insights · Delaware
New Castle County, DE: growth, migration and housing
New Castle County has 588,026 residents, up 3.0% since 2020 (+0.3% in the last year). In 2022–2023, 11,993 households moved in and 11,759 moved out (+234 net), while a net $0.9M of income left. Median household income is $91,166, the median home $352,200 and median rent $1,448 a month.
In Delaware: 3rd of 3 counties for 5-year population growth · 3rd of 3 counties for net in-migration (per resident) · 1st of 3 counties for median household income · 2nd of 3 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to New Castle County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Philadelphia County, PA | 1,201 | $80.7M |
| Delaware County, PA | 1,114 | $78.9M |
| Chester County, PA | 692 | $85.5M |
| Cecil County, MD | 533 | $34.6M |
| Montgomery County, PA | 277 | $22.2M |
| Kings County, NY | 206 | $13.4M |
| Camden County, NJ | 200 | $15.1M |
| Gloucester County, NJ | 159 | $11.4M |
Where leavers went
Top counties by households leaving New Castle County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Philadelphia County, PA | 881 | $50.6M |
| Delaware County, PA | 716 | $56.7M |
| Chester County, PA | 647 | $71.0M |
| Cecil County, MD | 643 | $41.5M |
| Montgomery County, PA | 200 | $15.4M |
| New York County, NY | 130 | $11.8M |
| Camden County, NJ | 111 | $7.6M |
| Salem County, NJ | 107 | $6.2M |
BizyFi in New Castle County
7 companies in the BizyFi directory are based here. Search them on the company map (company names with a free account), or browse Delaware 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.