What city is 21631 in?

21631 is a East New Market, MD mailing address. By land area, 2% lies inside East New Market; the rest is outside any Census-defined city or community.

What is the population of 21631?

About 2,429 people (±401), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 2,644.

What is the median household income in 21631?

$73,864 (±$16,882), 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 21631?

2 USPS carrier routes with 1,073 residential and 21 business mailboxes (1,094 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 21631?

The closest, measured center to center: 21664 (1.8 mi, Secretary), 21835 (3.3 mi), 21643 (5.7 mi, Hurlock), 21673 (7 mi, Trappe), 21659 (7.5 mi, Galestown) and 21613 (9.3 mi, Cambridge).

21631 ZIP Code, East New Market, MD

21631 is a ZIP code in East New Market, Maryland in Dorchester County. It covers 24 square miles of land. The closest ZIP codes are 21664, 21835 and 21643. 2,429 people live here in 942 households. With about 101 people per square mile it is lightly settled, and most homes are owner-occupied (85%). Median household income is $73,864, below the Maryland median of $103,678; the median age is 48.3, older than most ZIP codes.

Quick facts

Mailing city: East New Market, MD
County: Dorchester County
Land area: 24 sq mi
Population: 2,429
Median household income: $73,864
Carrier routes: 2 (1,073 homes)

Key figures

Measure	Value
Residents	2,429
Households	942
Median household income	$73,864
Income per person	$37,827
Median age	48.3
Homeowners	85.4%
Median home value	$306,700
Median rent	$1,541
Bachelor's degree or higher	23.8%
Average commute (minutes)	18.4
Households with kids under 18	26.8%
Moved in the past year	10.6%
Below the poverty line	4.9%
Broadband internet	91.0%
Speak a non-English language at home	13.0%

Household income

% of households	Value
<$10K	1.7%
$10–15K	1.3%
$15–25K	4.9%
$25–35K	7.3%
$35–50K	10.3%
$50–75K	25.6%
$75–100K	9.8%
$100–150K	15.5%
$150–200K	19.2%
$200K+	4.5%

Age

% of all residents	Value
<10	12.6%
10–19	12.1%
20–24	4.2%
25–34	7.9%
35–44	11.6%
45–54	10.9%
55–64	22.2%
65–74	11.2%
75+	7.4%

Tenure

% of housing units	Value
Owned, with mortgage	52.0%
Owned outright	27.5%
Rented	13.2%
Vacant	7.4%

Type of building

% of housing units	Value
Detached house	85.3%
Townhome	6.3%
2–4 units	0.5%
5–19 units	1.3%
20+ units	0.0%
Mobile / other	6.7%

Businesses in 21631

37 business establishments with 290 employees (ZIP Codes Business Patterns 2023).

Construction: 9
Retail Trade: 4
Transportation and Warehousing: 4
Wholesale Trade: 3
Administrative and Support and Waste Management and Remediation Services: 3
Health Care and Social Assistance: 3
Other Services (except Public Administration): 3

EDDM carrier routes

21631 has 2 USPS carrier routes with 1,073 residential and 21 business mailboxes. Open the EDDM route map.

Carrier routes in 21631

21631 has 2 USPS carrier routes (2 rural (R)) with 1,073 residential and 21 business mailboxes. Routes range from 522 homes (R311) to 551 homes (R312); the median route has 537 homes. The Census counted 942 households in 21631 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

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

Best routes in 21631 for…

Most businesses

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

Route R312 — USPS business mailboxes 13, 551 homes
Route R311 — USPS business mailboxes 8, 522 homes

Select these 2 routes on the route map

Every carrier route in 21631

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
R311	Rural	522	8	$57,188	—	—	—
R312	Rural	551	13	$51,050	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 21631 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

21664 — Secretary town, MD (1.8 mi)
21835 (3.3 mi)
21643 — Hurlock town, MD (5.7 mi)
21673 — Trappe town, MD (7 mi)
21659 — Galestown town, MD (7.5 mi)
21613 — Cambridge city, MD (9.3 mi)
21655 — Preston town, MD (11.3 mi)
21861 — Sharptown town, MD (11.9 mi)

Areas that include 21631

East New Market, MD ZIP codes — 1 ZIP code
Dorchester County ZIP codes — 18 ZIP codes
Maryland ZIP code data

Where it ranks

Mail every home in 21631

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) 21631, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 21631 in?: 21631 is a East New Market, MD mailing address. By land area, 2% lies inside East New Market; the rest is outside any Census-defined city or community.
What county is 21631 in?: 21631 is in Dorchester County.
What is the population of 21631?: About 2,429 people (±401), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 2,644.
What is the median household income in 21631?: $73,864 (±$16,882), 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 21631?: 2 USPS carrier routes with 1,073 residential and 21 business mailboxes (1,094 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 21631?: The closest, measured center to center: 21664 (1.8 mi, Secretary), 21835 (3.3 mi), 21643 (5.7 mi, Hurlock), 21673 (7 mi, Trappe), 21659 (7.5 mi, Galestown) and 21613 (9.3 mi, Cambridge).

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