ZIP code 21104: Marriottsville, MD
21104 is a ZIP code in Marriottsville, Maryland, mainly in Howard County, part of the Baltimore-Columbia-Towson, MD metro area. About 6,052 people live here.
- Population
- 6,052
- Median household income
- $191,804
- Typical home value
- $716,400+1.2% in 12 months
- Median rent
- $1,384gross, per month
- Median age
- 43.1
- Homeowners
- 97%of occupied homes
Shaded: ZIP code 21104's area. Click anywhere on the map to see which ZIP code it's in.
ZIP codes within 10 milesWithin 25 miles
ZIP code 21104 details
| City | Marriottsville |
|---|---|
| State | Maryland |
| County | Howard County (also partly Carroll County, Baltimore County) |
| Metro area | Baltimore-Columbia-Towson, MD |
| Time zone | Eastern Time (UTC−5), observes daylight saving time |
| Type | Standard (delivery area) |
| Land area | 17.1 sq mi, plus 0.8 sq mi of water |
| Population density | 355 people per sq mi |
| Bachelor's degree or higher | 64.4% of adults 25+ |
| Average commute | 31.9 minutes |
| Center coordinates | 39.34690, -76.91276 |
ZIP codes near 21104
| ZIP code | City | Distance | Population |
|---|---|---|---|
| 21163 | Woodstock, MD | 3.5 mi | 7,539 |
| 21794 | West Friendship, MD | 4.4 mi | 2,192 |
| 21042 | Ellicott City, MD | 4.9 mi | 43,327 |
| 21723 | Cooksville, MD | 5.0 mi | 669 |
| 21784 | Sykesville, MD | 5.0 mi | 39,258 |
| 21133 | Randallstown, MD | 5.8 mi | 31,398 |
| 21244 | Windsor Mill, MD | 7.3 mi | 38,208 |
| 21136 | Reisterstown, MD | 7.3 mi | 32,088 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Buying a home in 21104?
A typical home in ZIP code 21104 is worth about $716,400 (Zillow Home Value Index). The median household here earns $191,804 a year. See what buying here would cost per month, with Maryland average taxes and insurance filled in.
Monthly payment for a $716,400 homeWhat can a $191,804 income afford?Rental property numbers
About ZIP code 21104
What city is ZIP code 21104?
ZIP code 21104 is in Marriottsville, MD, in Howard County.
What county is ZIP code 21104 in?
21104 is mainly in Howard County, Maryland, and partly in Carroll County and Baltimore County.
What is the population of ZIP code 21104?
About 6,052 people live in ZIP code 21104, according to the American Community Survey 2020–2024 5-year estimates.
What time zone is ZIP code 21104 in?
21104 is in Eastern Time (UTC−5). It observes daylight saving time.