Residential delivery area · Massachusetts
ZIP Code 02638: Dennis, MA
ZIP code 02638 is in Dennis, Massachusetts, entirely in Barnstable County (Census 2020 ZIP-county file). About 3,300 people live there (Census Bureau, ACS 2020-2024). Median household income is $108,726 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Dennis (83%) and East Dennis (17%).
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Dennis · its only residential ZIP
- County
- Barnstable County
- Census places
- Dennis (83%) census-designated place; East Dennis (17%) census-designated place
- Metro area
- Barnstable Town, MA
- House district
- MA-9 119th Congress
- State
- Massachusetts
- Time zone
- Eastern
- Land area
- 5.6 sq mi · 577 people per sq mi
Where is ZIP code 02638?
02638 centers on 41.730°, -70.197° and covers 5.6 square miles of land plus 0.2 of water. It borders 3 ZIP codes: 02675, 02660, 02641.
The map draws ZIP code areas only. For the streets inside 02638, 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 02638 compare with the rest of Barnstable County?
| Measure | 02638 | In Barnstable County | In MA |
|---|---|---|---|
| People (ACS 2020-2024) | 3,253 | 26th of 48 | 386th of 539 |
| Median household income | $109k | 9th of 24 | 225th of 406 |
| Median home value | $828k | 7th of 33 | 81st of 449 |
Its median household income is higher than in 86% of U.S. residential ZIP codes, and it is denser than 73% 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 02638?
The 2020 Census counted 2,968 people in 02638; the ACS, which samples households over 2020-2024, estimates 3,253. Between the 2010 and 2020 censuses its population fell 7.5% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 3,253±527 (90% margin)
- 2020 Census count
- 2,968−7.5% since 2010 (3,207)
- Households
- 1,440
- Median age
- 60.5
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 02638?
Of the 3,253 people the ACS estimates in 02638, 13.4% are under 18 and 42.9% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (93.0%).
- Under 1813.4%
- 18 to 6443.7%
- 65 and older42.9%
- White, not Hispanic93.0%
- Hispanic or Latino6.3%
- Other or two or more0.6%
- Black, not Hispanic0.0%
- Asian, not Hispanic0.0%
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 02638 earn?
Median household income is $108,726 (ACS 2020-2024), the 9th highest of the 24 ranked ZIP codes in Barnstable County. It is not measurably different from 2015-2019 ($102,616 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $108,726±$12,000
- Income per person
- $63,789
- Below the poverty line
- 3.3%
- Unemployed (of the labor force)
- 1.9%
- Adults 25+ with a bachelor's degree
- 45.9%
- Adjusted gross income per tax return, 2022
- $112,6071,830 returns; wages 44% 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 02638?
FHFA's house price index for 02638, built from repeat sales and appraisals of the same homes, rose 104% from 2015 to 2025 and rose 69% from 2020 to 2025, and moved +4.4% in 2025.
- Median home value (owners' estimate)
- $827,900
- Median gross rent
- $1,208
- Homes owned by their occupants
- 87.1%
- Housing units
- 2,932
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 02638?
91 business establishments had a location in this ZIP code in 2023, 4 fewer than in 2018; the most are in accommodation and food services (ZIP Code Business Patterns).
- Accommodation and food services16
- Retail trade14
- Construction12
- Professional, scientific, and technical services10
- Health care and social assistance8
- Other services (except public administration)7
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 02638?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 02675 | Yarmouth Port | 7,297 | $111k | 2.5 mi |
| 02660 | South Dennis | 6,381 | $93k | 2.6 mi |
| 02641 | East Dennis | 316 | – | 2.7 mi |
| 02664 | South Yarmouth | 9,949 | $82k | 3.8 mi (near) |
| 02637 | Cummaquid | 227 | – | 4.2 mi (near) |
| 02670 | West Dennis | 1,087 | $87k | 5.0 mi (near) |
| 02639 | Dennis Port | 3,808 | $73k | 5.3 mi (near) |
| 02673 | West Yarmouth | 8,594 | $74k | 5.9 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.