Residential delivery area · Delaware
ZIP Code 19966: Millsboro, DE
ZIP code 19966 uses the postal name Millsboro, Delaware and lies entirely in Sussex County (Census 2020 ZIP-county file). About 36,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $78,305 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Millsboro (6%) and Long Neck (3%); 91% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Millsboro · its only residential ZIP
- County
- Sussex County
- Census places
- Millsboro (6%); Long Neck (3%) census-designated place
- Micro area
- Seaford, DE
- House district
- DE at large 119th Congress
- State
- Delaware
- Time zone
- Eastern
- Land area
- 89.1 sq mi · 403 people per sq mi
Where is ZIP code 19966?
19966 centers on 38.579°, -75.277° and covers 89.1 square miles of land plus 8.2 of water. It borders 11 ZIP codes: 19939, 19945, 19951, 19947, 21872, 19958, 19971, 21874, 19956, 21850 and more.
The map draws ZIP code areas only. For the streets inside 19966, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 19966 compare with the rest of Sussex County?
| Measure | 19966 | In Sussex County | In DE |
|---|---|---|---|
| People (ACS 2020-2024) | 35,884 | 1st of 23 | 10th of 68 |
| Median household income | $78k | 11th of 19 | 29th of 48 |
| Median home value | $318k | 13th of 21 | 28th of 50 |
Its median household income is higher than in 60% of U.S. residential ZIP codes, and it is denser than 70% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 19966?
The 2020 Census counted 32,520 people in 19966; the ACS, which samples households over 2020-2024, estimates 35,884. Between the 2010 and 2020 censuses its population grew 32.2% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 35,884
- 2020 Census count
- 32,520+32.2% since 2010 (24,601)
- Households
- 15,435
- Median age
- 53.9
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 19966?
Of the 35,884 people the ACS estimates in 19966, 17.1% are under 18 and 32.9% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (71.5%), then Hispanic or Latino (12.2%).
- Under 1817.1%
- 18 to 6450.0%
- 65 and older32.9%
- White, not Hispanic71.5%
- Hispanic or Latino12.2%
- Black, not Hispanic7.9%
- Other or two or more6.6%
- Asian, not Hispanic1.8%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 19966 earn?
Median household income is $78,305 (ACS 2020-2024), the 11th highest of the 19 ranked ZIP codes in Sussex County. It is not measurably different from 2015-2019 ($72,495 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $78,305
- Income per person
- $42,477
- Below the poverty line
- 11.8%
- Unemployed (of the labor force)
- 6.5%
- Adults 25+ with a bachelor's degree
- 26.1%
- Adjusted gross income per tax return, 2022
- $76,39918,460 returns; wages 53% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 19966?
FHFA's house price index for 19966, built from repeat sales and appraisals of the same homes, rose 72% from 2015 to 2025 and rose 50% from 2020 to 2025, and moved −1.0% in 2025.
- Median home value (owners' estimate)
- $317,500
- Median gross rent
- $1,325
- Homes owned by their occupants
- 82.2%
- Housing units
- 19,893
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 19966?
565 business establishments had a location in this ZIP code in 2023, 82 more than in 2018; the most are in retail trade (ZIP Code Business Patterns).
- Retail trade91
- Construction78
- Health care and social assistance77
- Accommodation and food services65
- Other services (except public administration)57
- Administrative and support and waste management and remediation services47
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 19966?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 19939 | Dagsboro | 7,490 | $90k | 3.8 mi |
| 19945 | Frankford | 9,640 | $88k | 6.2 mi |
| 19951 | Harbeson | 2,245 | $96k | 7.4 mi |
| 19947 | Georgetown | 20,760 | $71k | 9.3 mi |
| 21872 | Whaleyville, MD | 661 | $118k | 11.4 mi |
| 19958 | Lewes | 31,938 | $97k | 11.9 mi |
| 19971 | Rehoboth Beach | 14,886 | $102k | 12.4 mi |
| 21874 | Willards, MD | 1,693 | $78k | 13.4 mi |
| 19956 | Laurel | 16,327 | $66k | 14.3 mi |
| 21850 | Pittsville, MD | 3,850 | $80k | 16.4 mi |
| 19940 | Delmar | 7,540 | $65k | 17.1 mi |
| 19967 | Millville | 2,376 | $98k | 8.9 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.