21666 ZIP Code, Stevensville, MD
21666 is a ZIP code in Stevensville, Maryland in Queen Anne's County. It covers 22 square miles of land. The closest ZIP codes are 21619, 21638 and 21409. 14,394 people live here in 5,555 households. With about 659 people per square mile it is lightly settled, and most homes are owner-occupied (85%). Median household income is $123,645, above the Maryland median of $103,678; the median age is 46.0, older than most ZIP codes.
Quick facts
- Mailing city: Stevensville, MD
- County: Queen Anne's County
- Land area: 22 sq mi
- Population: 14,394
- Median household income: $123,645
- Carrier routes: 11 (5,846 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 14,394 |
| Households | 5,555 |
| Median household income | $123,645 |
| Income per person | $61,123 |
| Median age | 46 |
| Homeowners | 84.6% |
| Median home value | $494,300 |
| Median rent | $1,764 |
| Bachelor's degree or higher | 40.9% |
| Average commute (minutes) | 31.1 |
| Households with kids under 18 | 29.0% |
| Moved in the past year | 10.2% |
| Below the poverty line | 3.9% |
| Broadband internet | 92.9% |
| Speak a non-English language at home | 2.5% |
Household income
| % of households | Value |
|---|---|
| <$10K | 4.2% |
| $10–15K | 1.4% |
| $15–25K | 3.1% |
| $25–35K | 6.9% |
| $35–50K | 5.1% |
| $50–75K | 8.3% |
| $75–100K | 9.9% |
| $100–150K | 20.7% |
| $150–200K | 10.9% |
| $200K+ | 29.5% |
Age
| % of all residents | Value |
|---|---|
| <10 | 10.3% |
| 10–19 | 12.3% |
| 20–24 | 5.2% |
| 25–34 | 9.6% |
| 35–44 | 10.9% |
| 45–54 | 15.1% |
| 55–64 | 14.1% |
| 65–74 | 13.6% |
| 75+ | 9.0% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 60.8% |
| Owned outright | 20.1% |
| Rented | 14.3% |
| Vacant | 4.7% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 84.5% |
| Townhome | 7.6% |
| 2–4 units | 1.7% |
| 5–19 units | 4.6% |
| 20+ units | 1.0% |
| Mobile / other | 0.6% |
Businesses in 21666
439 business establishments with 4,506 employees (ZIP Codes Business Patterns 2023).
- Construction: 71
- Professional, Scientific, and Technical Services: 58
- Health Care and Social Assistance: 48
- Other Services (except Public Administration): 42
- Retail Trade: 36
- Administrative and Support and Waste Management and Remediation Services: 34
- Wholesale Trade: 30
- Accommodation and Food Services: 29
EDDM carrier routes
21666 has 11 USPS carrier routes with 5,846 residential and 449 business mailboxes. Open the EDDM route map.
Carrier routes in 21666
21666 has 11 USPS carrier routes (11 rural (R)) with 5,846 residential and 449 business mailboxes. Routes range from 308 homes (R008) to 700 homes (R009); the median route has 546 homes. The Census counted 5,555 households in 21666 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 0 |
| 250–499 | 2 |
| 500–749 | 9 |
| 750–999 | 0 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 21666 for…
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route R005 — USPS business mailboxes 121, 535 homes
- Route R008 — USPS business mailboxes 109, 308 homes
- Route R010 — USPS business mailboxes 97, 581 homes
- Route R011 — USPS business mailboxes 92, 329 homes
- Route R007 — USPS business mailboxes 19, 597 homes
Select these 5 routes on the route map
Every carrier route in 21666
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| R001 | Rural | 527 | 1 | $110,014 | — | — | — |
| R002 | Rural | 550 | 0 | $124,582 | — | — | — |
| R003 | Rural | 546 | 0 | $120,304 | — | — | — |
| R004 | Rural | 653 | 4 | $102,526 | — | — | — |
| R005 | Rural | 535 | 121 | $126,933 | — | — | — |
| R006 | Rural | 520 | 2 | $137,572 | — | — | — |
| R007 | Rural | 597 | 19 | $102,526 | — | — | — |
| R008 | Rural | 308 | 109 | $123,326 | — | — | — |
| R009 | Rural | 700 | 4 | $102,526 | — | — | — |
| R010 | Rural | 581 | 97 | $124,582 | — | — | — |
| R011 | Rural | 329 | 92 | $102,526 | — | — | — |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 21666 on the EDDM route map.
How route demographics are estimated
Mailbox counts come from USPS; demographics are estimates
The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).
How a route gets its figures: the block-group length-share method
We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.
Margins of error
Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.
Different years
USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.
Why some routes show identical figures
Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.
Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.
Nearby ZIP codes
- 21619 — Chester CDP, MD (3.8 mi)
- 21638 — Grasonville CDP, MD (6.9 mi)
- 21409 — Cape St. Claire CDP, MD (7.9 mi)
- 21402 — Naval Academy CDP, MD (8 mi)
- 21624 (8 mi)
- 21403 — Annapolis Neck CDP, MD (8.3 mi)
- 21647 (10.3 mi)
- 21658 — Queenstown town, MD (10.3 mi)
Areas that include 21666
- Stevensville, MD ZIP codes — 1 ZIP code
- Romancoke, MD ZIP codes — 1 ZIP code
- Queen Anne's County ZIP codes — 15 ZIP codes
- Maryland ZIP code data
Where it ranks
- No. 3 of 12: highest median household income in Queen Anne's County
- No. 2 of 12: highest median home value in Queen Anne's County
- No. 5 of 12: highest share of owner-occupied homes in Queen Anne's County
- No. 5 of 12: highest share of residents who moved in during the past year in Queen Anne's County
- No. 5 of 12: highest median age in Queen Anne's County
- No. 2 of 11: fastest population growth in Queen Anne's County
Mail every home in 21666
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) 21666, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 21666 in?
- 21666 is a Stevensville, MD mailing address. By land area, 29% lies inside Stevensville, 6% lies inside Romancoke and 2% lies inside Chester; the rest is outside any Census-defined city or community.
- What county is 21666 in?
- 21666 is in Queen Anne's County.
- What is the population of 21666?
- About 14,394 people (±920), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 12,848.
- What is the median household income in 21666?
- $123,645 (±$11,144), 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 21666?
- 11 USPS carrier routes with 5,846 residential and 449 business mailboxes (6,296 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 21666?
- The closest, measured center to center: 21619 (3.8 mi, Chester), 21638 (6.9 mi, Grasonville), 21409 (7.9 mi, Cape St. Claire), 21402 (8 mi, Naval Academy), 21624 (8 mi) and 21403 (8.3 mi, Annapolis Neck).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.