What city is 21663 in?

21663 is a Saint Michaels, MD mailing address. By land area, 10% lies inside St. Michaels; the rest is outside any Census-defined city or community.

What is the population of 21663?

About 3,764 people (±454), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 3,142.

What is the median household income in 21663?

$89,775 (±$16,515), 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 21663?

5 USPS carrier routes with 1,604 residential and 89 business mailboxes (1,693 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 21663?

The closest, measured center to center: 21647 (2.9 mi), 21612 (3.1 mi), 21676 (3.8 mi), 21624 (4 mi), 21653 (4.3 mi) and 21662 (5.4 mi).

21663 ZIP Code, Saint Michaels, MD

21663 is a ZIP code in Saint Michaels, Maryland in Talbot County. It covers 12 square miles of land. The closest ZIP codes are 21647, 21612 and 21676. 3,764 people live here in 1,677 households. With about 309 people per square mile it is lightly settled, and most homes are owner-occupied (78%). Median household income is $89,775, below the Maryland median of $103,678; the median age is 56.0, older than most ZIP codes.

Quick facts

Mailing city: Saint Michaels, MD
County: Talbot County
Land area: 12 sq mi
Population: 3,764
Median household income: $89,775
Carrier routes: 5 (1,604 homes)

Key figures

Measure	Value
Residents	3,764
Households	1,677
Median household income	$89,775
Income per person	$67,202
Median age	56
Homeowners	78.1%
Median home value	$650,500
Median rent	$1,067
Bachelor's degree or higher	52.8%
Average commute (minutes)	23.1
Households with kids under 18	20.0%
Moved in the past year	11.5%
Below the poverty line	5.8%
Broadband internet	90.1%
Speak a non-English language at home	13.3%

Household income

% of households	Value
<$10K	5.0%
$10–15K	2.8%
$15–25K	4.1%
$25–35K	6.4%
$35–50K	6.9%
$50–75K	15.7%
$75–100K	13.4%
$100–150K	11.3%
$150–200K	12.6%
$200K+	21.8%

Age

% of all residents	Value
<10	6.7%
10–19	9.6%
20–24	4.9%
25–34	5.9%
35–44	7.1%
45–54	14.7%
55–64	17.7%
65–74	19.0%
75+	14.5%

Tenure

% of housing units	Value
Owned, with mortgage	34.8%
Owned outright	25.1%
Rented	16.5%
Vacant	23.6%

Type of building

% of housing units	Value
Detached house	78.8%
Townhome	10.2%
2–4 units	5.9%
5–19 units	3.8%
20+ units	1.3%
Mobile / other	0.0%

Businesses in 21663

148 business establishments with 1,396 employees (ZIP Codes Business Patterns 2023).

Accommodation and Food Services: 33
Retail Trade: 27
Real Estate and Rental and Leasing: 12
Other Services (except Public Administration): 12
Manufacturing: 10
Professional, Scientific, and Technical Services: 8
Administrative and Support and Waste Management and Remediation Services: 8
Arts, Entertainment, and Recreation: 8

EDDM carrier routes

21663 has 5 USPS carrier routes with 1,604 residential and 89 business mailboxes. Open the EDDM route map.

Carrier routes in 21663

21663 has 5 USPS carrier routes (5 rural (R)) with 1,604 residential and 89 business mailboxes. Routes range from 60 homes (R005) to 565 homes (R003); the median route has 256 homes. The Census counted 1,677 households in 21663 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	2
250–499	1
500–749	2
750–999	0
1,000–1,499	0
1,500+	0

Best routes in 21663 for…

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

Route R001 — USPS business mailboxes 57, 517 homes
Route R003 — USPS business mailboxes 19, 565 homes
Route R006 — USPS business mailboxes 11, 206 homes
Route R002 — USPS business mailboxes 2, 256 homes

Select these 4 routes on the route map

Every carrier route in 21663

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
R001	Rural	517	57	$111,186	—	—	—
R002	Rural	256	2	$108,183	—	—	—
R003	Rural	565	19	$94,224	—	—	—
R005	Rural	60	0	$94,224	—	—	—
R006	Rural	206	11	$94,224	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 21663 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

21647 (2.9 mi)
21612 (3.1 mi)
21676 (3.8 mi)
21624 (4 mi)
21653 (4.3 mi)
21662 (5.4 mi)
21652 (5.5 mi)
21601 — Easton town, MD (7.7 mi)

Areas that include 21663

St. Michaels, MD ZIP codes — 1 ZIP code
Saint Michaels, MD ZIP codes — 1 ZIP code
Talbot County ZIP codes — 16 ZIP codes
Maryland ZIP code data

Where it ranks

Mail every home in 21663

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) 21663, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 21663 in?: 21663 is a Saint Michaels, MD mailing address. By land area, 10% lies inside St. Michaels; the rest is outside any Census-defined city or community.
What county is 21663 in?: 21663 is in Talbot County.
What is the population of 21663?: About 3,764 people (±454), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 3,142.
What is the median household income in 21663?: $89,775 (±$16,515), 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 21663?: 5 USPS carrier routes with 1,604 residential and 89 business mailboxes (1,693 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 21663?: The closest, measured center to center: 21647 (2.9 mi), 21612 (3.1 mi), 21676 (3.8 mi), 21624 (4 mi), 21653 (4.3 mi) and 21662 (5.4 mi).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.