Population
1,059,952
2025
+6.9% since 2020
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2025), 2025. Resident population, July 1 estimate.
What are the fastest-growing counties in Delaware?
Sussex County (+16.1%), Kent County (+6.8%) and New Castle County (+3.0%) grew fastest in Delaware between 2020 and 2025.
Delaware as a whole grew 6.9% between 2020 and 2025, to 1,059,952 residents.
Data as of 2025 · updated
Map, parcel and listing layers cover North and South Carolina only for now.
All 3 Delaware counties ranked
| Rank | County | Residents 2025 | Change 2020–25 | Net migration per 1,000, 2025 | New homes per 1,000, 2025 |
|---|---|---|---|---|---|
| 1 | Sussex County | 277,140 | +16.1% | 22.7 | 14.0 |
| 2 | Kent County | 194,786 | +6.8% | 7.2 | 6.5 |
| 3 | New Castle County | 588,026 | +3.0% | −1.4 | 2.2 |
Ranked by the change in Census Bureau population estimates, 2020–2025.
Statewide totals
Net domestic migration
+6,855
2025
6.5 per 1,000 residents
+50,977 in total, 2021–2025
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2025), 2025. People moving in from other U.S. counties minus people moving out.
New homes permitted
6,468
2025
−23.9% since 2021
6.1 per 1,000 residents
Source: U.S. Census Bureau, Building Permits Survey, 2025. Housing units authorized by building permits in the year.
Private-sector employment
446,364
2023
+12.2% since 2018
Source: U.S. Census Bureau, County Business Patterns, 2023. Paid employees of private employers in mid-March (County Business Patterns).
Metro areas
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Questions
Is Delaware growing?
Delaware as a whole grew 6.9% between 2020 and 2025, to 1,059,952 residents. Statewide figures add up its counties.
What is the fastest-growing county in Delaware?
Sussex County, which grew 16.1% between 2020 and 2025 to 277,140 residents (Census Bureau population estimates). Kent County (+6.8%) and New Castle County (+3.0%) came next.
Which Delaware counties are losing population?
None of the 3 ranked counties lost residents between 2020 and 2025.
Where are people moving in Delaware?
For their size, Sussex County (22.7 per 1,000 residents), Kent County (7.2 per 1,000 residents) and New Castle County (−1.4 per 1,000 residents) drew the most net domestic migration (people moving in from other U.S. counties minus people moving out) in 2025.
Fastest-growing counties in other states
- Alabama
- Alaska
- Arizona
- Arkansas
- California
- Colorado
- Connecticut
- District of Columbia
- Florida
- Georgia
- Hawaii
- Idaho
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Mississippi
- Missouri
- Montana
- Nebraska
- Nevada
- New Hampshire
- New Jersey
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- Rhode Island
- South Carolina
- South Dakota
- Tennessee
- Texas
- Utah
- Vermont
- Virginia
- Washington
- West Virginia
- Wisconsin
- Wyoming
Sources and method
- U.S. Census Bureau, Population Estimates Program (Vintage 2025)
- U.S. Census Bureau, Building Permits Survey
- U.S. Census Bureau, County Business Patterns
Each number shows its own period. Changes compare the latest period with five years earlier (or the earliest period available). Beacon CRE last refreshed these figures on 2026-11-05. Figures come from public federal statistics and are informational only, not investment advice. Check the source before relying on a number. Methodology: how we compute every number. More on every layer: data sources and licences.