Eldersburg, MD ZIP Codes
2 ZIP codes serve Eldersburg, Maryland: 21784 and 21104. Together they are home to 45,310 residents in 15,513 households. That is more than the 31,695 people counted inside Eldersburg Census-designated place, because these ZIP codes reach past its boundary. Median household income ranges from $139,395 in 21784 to $191,804 in 21104.
Eldersburg Census-designated place
| Measure | Census figure |
|---|---|
| Residents | 31,695 |
| Households | 10,903 |
| Median household income | $142,954 |
| Median home value | $494,300 |
| Median age | 39 |
| Median rent | $1,705 |
All 2 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 45,310 |
| Households (sum of ZIP codes) | 15,513 |
| Median household income, range across ZIP codes | $139,395 (21784) to $191,804 (21104) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $146,479 |
| Homeowners | 88.6% |
| Households with kids under 18 | 39.9% |
| Moved in the past year | 6.0% |
| Carrier routes in EDDM2GO's route library | 32 routes, 17,218 homes (2 of 2 ZIP codes) |
Top facts
- Highest median household income in Eldersburg: 21104 ($191,804)
- Most residents: 21784 (39,258 people)
- Highest homeownership: 21104 (97.0% own their home)
- Most households with kids: 21784 (40.7% of households)
- Most new movers: 21104 (8.3% moved in last year)
- Youngest median age: 21784 (38.9 years)
- Highest median home value: 21104 ($680,200)
Every ZIP code in Eldersburg
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 21784 | Sykesville | 39,258 | 13,416 | $139,395 | $491,800 | 87.3% | 40.7% | 5.6% | 26 | 15,795 | 59% of its land |
| 21104 | Marriottsville | 6,052 | 2,097 | $191,804 | $680,200 | 97.0% | 34.6% | 8.3% | 6 | 2,408 | 32% of its land |
A ZIP code is listed for Eldersburg when at least 10% of its land lies inside the Eldersburg Census-designated place, when it holds at least 10% of the place's land, or when its USPS mailing city is Eldersburg. The table shows which applies. Totals add up whole ZIP codes, so they include any parts outside Eldersburg.
Counties
- Carroll County — 14 ZIP codes
- Howard County — 24 ZIP codes
Price a mailing to Eldersburg ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in Eldersburg, MD?
- 21784 and 21104. A ZIP code is listed for Eldersburg when at least 10% of its land lies inside the Eldersburg Census-designated place, when it holds at least 10% of the place's land, or when its USPS mailing city is Eldersburg.
- What is the population of Eldersburg, MD?
- The Census Bureau counts 31,695 residents inside Eldersburg Census-designated place (ACS 2020–2024). The 2 ZIP codes that serve Eldersburg hold 45,310 residents in all.
- What is the median household income in Eldersburg, MD?
- $142,954 inside Eldersburg Census-designated place, per the Census Bureau. Across its ZIP codes the medians run from $139,395 to $191,804.
- Which Eldersburg ZIP code has the highest median household income?
- 21104, at $191,804, among ZIP codes with at least 1,000 residents.
- How many carrier routes and mailboxes are in Eldersburg, MD?
- For the 2 of 2 ZIP codes in EDDM2GO's stored route library: 32 carrier routes reaching 17,218 residential and 985 business mailboxes.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.