21664 ZIP Code, Secretary, MD
21664 is a ZIP code in Secretary, Maryland in Dorchester County. It covers 0.3 square miles of land. The closest ZIP codes are 21631, 21643 and 21835. 635 people live here in 217 households. At about 2,182 people per square mile it has suburban density, and most homes are owner-occupied (70%). Median household income is $82,721, below the Maryland median of $103,678.
Quick facts
- Mailing city: Secretary, MD
- County: Dorchester County
- Land area: 0.3 sq mi
- Population: 635
- Median household income: $82,721
Key figures
| Measure | Value |
|---|---|
| Residents | 635 |
| Households | 217 |
| Median household income | $82,721 |
| Income per person | $29,251 |
| Median age | 34 |
| Homeowners | 70.0% |
| Median home value | $172,000 |
| Median rent | $1,175 |
| Bachelor's degree or higher | 20.3% |
| Average commute (minutes) | 25.4 |
| Households with kids under 18 | 36.4% |
| Moved in the past year | 5.8% |
| Below the poverty line | 5.5% |
| Broadband internet | 86.6% |
| Speak a non-English language at home | 21.8% |
Household income
| % of households | Value |
|---|---|
| <$10K | 2.8% |
| $10–15K | 0.0% |
| $15–25K | 5.5% |
| $25–35K | 6.0% |
| $35–50K | 12.4% |
| $50–75K | 20.7% |
| $75–100K | 20.3% |
| $100–150K | 18.4% |
| $150–200K | 12.0% |
| $200K+ | 1.8% |
Age
| % of all residents | Value |
|---|---|
| <10 | 12.1% |
| 10–19 | 23.2% |
| 20–24 | 5.8% |
| 25–34 | 9.3% |
| 35–44 | 16.2% |
| 45–54 | 10.1% |
| 55–64 | 10.5% |
| 65–74 | 7.4% |
| 75+ | 5.4% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 35.1% |
| Owned outright | 24.3% |
| Rented | 25.1% |
| Vacant | 15.4% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 93.8% |
| Townhome | 1.9% |
| 2–4 units | 0.8% |
| 5–19 units | 0.0% |
| 20+ units | 0.0% |
| Mobile / other | 3.5% |
Businesses in 21664
12 business establishments with 58 employees (ZIP Codes Business Patterns 2023).
- Construction: 3
- Other Services (except Public Administration): 3
EDDM carrier routes
See every USPS carrier route in 21664 with residential and business mailbox counts on the route map. Open the EDDM route map.
Nearby ZIP codes
- 21631 — East New Market town, MD (1.8 mi)
- 21643 — Hurlock town, MD (4.9 mi)
- 21835 (5.1 mi)
- 21673 — Trappe town, MD (5.7 mi)
- 21659 — Galestown town, MD (8.2 mi)
- 21655 — Preston town, MD (9.7 mi)
- 21613 — Cambridge city, MD (10.2 mi)
- 21654 — Oxford town, MD (11.5 mi)
Areas that include 21664
- Secretary, MD ZIP codes — 1 ZIP code
- Dorchester County ZIP codes — 18 ZIP codes
- Maryland ZIP code data
Mail every home in 21664
Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.
EDDM guides
ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 21664, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 21664 in?
- 21664 is a Secretary, MD mailing address. By land area, 100% lies inside Secretary.
- What county is 21664 in?
- 21664 is in Dorchester County.
- What is the population of 21664?
- About 635 people (±227), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 472.
- What is the median household income in 21664?
- $82,721 (±$17,352), compared with $103,678 for Maryland as a whole. Half the households in the ZIP code earn more and half earn less.
- How many carrier routes and mailboxes are in 21664?
- EDDM2GO's stored route library does not include 21664 yet. The EDDM route map loads its carrier routes and mailbox counts when you search the ZIP code.
- What ZIP codes are near 21664?
- The closest, measured center to center: 21631 (1.8 mi, East New Market), 21643 (4.9 mi, Hurlock), 21835 (5.1 mi), 21673 (5.7 mi, Trappe), 21659 (8.2 mi, Galestown) and 21655 (9.7 mi, Preston).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.