Population
277,140
2025
+16.1% since 2020
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2025), 2025. Resident population, July 1 estimate.
Seaford, DE micro area: population growth, jobs and income
The Seaford, DE micro area gained 5,907 residents between 2024 and 2025 (+2.2%).
The Seaford, DE micro area had an estimated 277,140 residents in 2025, up 16.1% (38,513 more people) since 2020.
Data as of 2025 · updated
Map, parcel and listing layers cover North and South Carolina only for now.
Headline numbers
Net domestic migration
+6,287
2025
22.7 per 1,000 residents
+39,199 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
3,885
2025
−10.8% since 2024
14.0 per 1,000 residents
Source: U.S. Census Bureau, Building Permits Survey, 2025. Housing units authorized by building permits in the year.
Median household income
$81,497
2020–24
Source: U.S. Census Bureau, American Community Survey 5-year estimates, 2020–24. American Community Survey 5-year estimate.
Private-sector employment
78,541
2023
Source: U.S. Census Bureau, County Business Patterns, 2023. Paid employees of private employers in mid-March (County Business Patterns).
Net migration (IRS tax returns)
+5,662
2022–23
Source: IRS Statistics of Income, U.S. Population Migration Data, 2022–23. People on tax returns moving in minus moving out, U.S. and abroad; the sum of the member counties (moves between them cancel out).
Population, migration, employment, permits, unemployment and income are the figures each agency publishes for the area itself (OMB Bulletin 23-01 delineation; ACS 2016-20 and CBP 2018 use the delineation of their year). IRS migration is the sum of the member counties.
What the numbers say
Net domestic migration added 6,287 people in 2025: more people moved in from other U.S. counties than moved out.
Private employers had 78,541 paid employees in mid-March 2023 (County Business Patterns).
Builders were authorized to start 3,885 new homes in 2025, or 14.0 per 1,000 residents.
Median household income was $81,497 in the 2020–24 American Community Survey.
Population growth over five years ranks 4th of 538 U.S. micro areas.
IRS tax-return data for 2022-2023 show a net gain of 5,662 people (the sum of its counties).
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How it ranks
| Measure | Among U.S. micro areas |
|---|---|
| Population growth | 4th of 538 |
| Net domestic migration per 1,000 residents | 4th of 538 |
| Median household income | 50th of 538 |
| New homes permitted per 1,000 residents | 10th of 534 |
1st = highest (lowest for unemployment), against areas with a figure for the same period.
Fastest-growing metro areas in the U.S.
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Counties in this micro area
| County | Role | Residents2025 | Share of residents2025 | Change2020–2025 | Share of the change2020–2025 |
|---|---|---|---|---|---|
| Sussex County, DE | Central | 277,140 | 100.0% | +38,513 (+16.1%) | 100% |
Census Bureau population estimates (July 1). Shares are of the member counties' total; a share of the change shows only when every county moved the same way. – means no figure for the common period.
Nearby and similar metro areas
Next to this micro area
Similar in size
Questions
Is the Seaford, DE micro area growing?
Yes. Its population grew 16.1% between 2020 and 2025, about 38,513 more people (Census Bureau population estimates).
How many people moved to the Seaford, DE micro area?
On net, about 6,287 people in 2025: that many more moved in from other U.S. counties than moved out (Census Bureau net domestic migration estimate).
What is the population of the Seaford, DE micro area?
About 277,140 people, according to the U.S. Census Bureau's population estimate for July 1, 2025.
How many jobs are in the Seaford, DE micro area?
Private employers there had 78,541 paid employees in mid-March 2023 (Census Bureau County Business Patterns; government jobs and the self-employed are not counted).
What is the median household income in the Seaford, DE micro area?
$81,497 in the 2020–24 American Community Survey 5-year estimates.
Sussex County data alerts
Email me when Sussex County gets new Census numbers: population, building permits, jobs and income. About 4 emails a year, one click to stop.
Sources and method
- U.S. Census Bureau, Population Estimates Program (Vintage 2025)
- U.S. Census Bureau, Building Permits Survey
- U.S. Census Bureau, American Community Survey 5-year estimates
- U.S. Census Bureau, County Business Patterns
- IRS Statistics of Income, U.S. Population Migration Data
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.
Jobs outside North and South Carolina use County Business Patterns (paid private-sector employees in mid-March); wages and government jobs are not included.