Residential delivery area · Maryland
ZIP Code 21036: Dayton, MD
ZIP code 21036 uses the postal name Dayton, Maryland and lies entirely in Howard County (Census 2020 ZIP-county file). About 2,600 people live there (Census Bureau, ACS 2020-2024). Median household income is $218,036 (Census Bureau, ACS 2020-2024). Its land lies outside any incorporated or census-designated place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Dayton · its only residential ZIP
- County
- Howard County
- Metro area
- Baltimore-Columbia-Towson, MD
- House district
- MD-3 119th Congress
- State
- Maryland
- Time zone
- Eastern
- Land area
- 6.3 sq mi · 411 people per sq mi
Where is ZIP code 21036?
21036 centers on 39.235°, -77.007° and covers 6.3 square miles of land plus 0.4 of water. It borders 4 ZIP codes: 21737, 21029, 20833, 21042.
The map draws ZIP code areas only. For the streets inside 21036, 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 21036 compare with the rest of Howard County?
| Measure | 21036 | In Howard County | In MD |
|---|---|---|---|
| People (ACS 2020-2024) | 2,569 | 21st of 25 | 291st of 477 |
| Median household income | $218k | not ranked | not ranked |
| Median home value | $881k | 6th of 23 | 12th of 320 |
21036's median household income is not ranked: its 90% margin of error (±$73,495) is more than a quarter of the figure ($218,036). Rankings use ZIP codes of 1,000 or more people living in households, with margins at most 25% of the figure.
It is denser than 70% of 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 21036?
The 2020 Census counted 2,307 people in 21036; the ACS, which samples households over 2020-2024, estimates 2,569. Between the 2010 and 2020 censuses its population grew 9.1% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 2,569±496 (90% margin)
- 2020 Census count
- 2,307+9.1% since 2010 (2,114)
- Households
- 882
- Median age
- 48.8
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 21036?
Of the 2,569 people the ACS estimates in 21036, 21.7% are under 18 and 25.2% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (77.6%).
- Under 1821.7%
- 18 to 6453.1%
- 65 and older25.2%
- White, not Hispanic77.6%
- Hispanic or Latino7.1%
- Asian, not Hispanic6.4%
- Black, not Hispanic5.4%
- Other or two or more3.5%
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 21036 earn?
Median household income is $218,036 (ACS 2020-2024). It is not measurably different from 2015-2019 ($217,893 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $218,036±$73,495
- Income per person
- $88,079
- Below the poverty line
- 2.2%
- Unemployed (of the labor force)
- 7.5%
- Adults 25+ with a bachelor's degree
- 71.3%
- Adjusted gross income per tax return, 2022
- $208,4471,130 returns; wages 62% 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 21036?
FHFA's house price index for 21036, built from repeat sales and appraisals of the same homes, rose 42% from 2015 to 2025 and rose 34% from 2020 to 2025.
- Median home value (owners' estimate)
- $881,300
- Median gross rent
- –
- Homes owned by their occupants
- 99.3%
- Housing units
- 905
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 21036?
49 business establishments had a location in this ZIP code in 2023, 12 fewer than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction13
- Professional, scientific, and technical services10
- Administrative and support and waste management and remediation services6
- Health care and social assistance6
- Retail trade3
- Finance and insurance3
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 21036?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 21737 | Glenelg | 2,474 | $250k+ | 1.4 mi |
| 21029 | Clarksville | 13,607 | $244k | 2.9 mi |
| 20833 | Brookeville | 7,860 | $204k | 3.4 mi |
| 21042 | Ellicott City | 43,327 | $190k | 6.7 mi |
| 21738 | Glenwood | 3,696 | $250k+ | 3.3 mi (near) |
| 20862 | Brinklow | 430 | $190k | 3.8 mi (near) |
| 20777 | Highland | 3,221 | $226k | 4.6 mi (near) |
| 21794 | West Friendship | 2,192 | $232k | 4.9 mi (near) |
| 20861 | Ashton | 2,890 | $163k | 6.0 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.