What city is 21244 in?

21244 is a Windsor Mill, MD mailing address. By land area, 44% lies inside Milford Mill, 17% lies inside Woodlawn and 5% lies inside Randallstown; the rest is outside any Census-defined city or community.

What is the population of 21244?

About 38,208 people (±2,255), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 38,015.

What is the median household income in 21244?

$85,114 (±$9,140), 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 21244?

28 USPS carrier routes with 15,420 residential and 867 business mailboxes (16,288 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 21244?

The closest, measured center to center: 21207 (3.1 mi, Lochearn), 21133 (3.5 mi, Randallstown), 21163 (3.8 mi, Randallstown), 21208 (4.4 mi, Pikesville), 21228 (4.6 mi, Catonsville) and 21215 (5.1 mi, Baltimore).

21244 ZIP Code, Windsor Mill, MD

21244 is a ZIP code in Windsor Mill, Maryland in Baltimore County. It covers 14 square miles of land. The closest ZIP codes are 21207, 21133 and 21163. 38,208 people live here in 14,157 households. At about 2,703 people per square mile it has suburban density, and owners and renters are mixed (49% own). Median household income is $85,114, below the Maryland median of $103,678.

Quick facts

Mailing city: Windsor Mill, MD
County: Baltimore County
Land area: 14 sq mi
Population: 38,208
Median household income: $85,114
Carrier routes: 28 (15,420 homes)

Key figures

Measure	Value
Residents	38,208
Households	14,157
Median household income	$85,114
Income per person	$37,916
Median age	36
Homeowners	49.0%
Median home value	$282,600
Median rent	$1,622
Bachelor's degree or higher	35.2%
Average commute (minutes)	30
Households with kids under 18	33.3%
Moved in the past year	11.1%
Below the poverty line	7.8%
Broadband internet	91.8%
Speak a non-English language at home	17.8%

Household income

% of households	Value
<$10K	4.0%
$10–15K	1.4%
$15–25K	4.0%
$25–35K	5.1%
$35–50K	12.2%
$50–75K	18.4%
$75–100K	15.8%
$100–150K	23.0%
$150–200K	8.5%
$200K+	7.5%

Age

% of all residents	Value
<10	14.2%
10–19	13.3%
20–24	5.1%
25–34	15.2%
35–44	14.9%
45–54	12.1%
55–64	13.6%
65–74	8.2%
75+	3.3%

Tenure

% of housing units	Value
Owned, with mortgage	35.7%
Owned outright	11.3%
Rented	48.3%
Vacant	4.8%

Type of building

% of housing units	Value
Detached house	35.9%
Townhome	30.2%
2–4 units	2.0%
5–19 units	28.1%
20+ units	3.6%
Mobile / other	0.1%

Businesses in 21244

678 business establishments with 11,385 employees (ZIP Codes Business Patterns 2023).

Health Care and Social Assistance: 143
Retail Trade: 105
Professional, Scientific, and Technical Services: 72
Accommodation and Food Services: 68
Other Services (except Public Administration): 64
Construction: 31
Wholesale Trade: 31
Administrative and Support and Waste Management and Remediation Services: 27

EDDM carrier routes

21244 has 28 USPS carrier routes with 15,420 residential and 867 business mailboxes. Open the EDDM route map.

Carrier routes in 21244

21244 has 28 USPS carrier routes (25 city (C), 3 rural (R)) with 15,420 residential and 867 business mailboxes. Routes range from 149 homes (C039) to 1,274 homes (R004); the median route has 511 homes. The Census counted 14,157 households in 21244 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	2
250–499	11
500–749	11
750–999	3
1,000–1,499	1
1,500+	0

Best routes in 21244 for…

Most businesses

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

Route C039 — USPS business mailboxes 206, 149 homes
Route C061 — USPS business mailboxes 110, 150 homes
Route C097 — USPS business mailboxes 83, 462 homes
Route C021 — USPS business mailboxes 81, 312 homes
Route C052 — USPS business mailboxes 73, 428 homes

Select these 5 routes on the route map

Every carrier route in 21244

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
C011	City	502	20	$85,319	—	—	—
C018	City	746	1	$83,934	—	—	—
C019	City	756	19	$89,035	—	—	—
C021	City	312	81	$105,716	—	—	—
C023	City	332	2	$106,165	—	—	—
C031	City	388	0	$104,024	—	—	—
C037	City	817	4	$65,617	—	—	—
C039	City	149	206	$89,035	—	—	—
C041	City	694	66	$55,645	—	—	—
C042	City	331	6	$87,032	—	—	—
C046	City	524	56	$122,745	—	—	—
C048	City	519	2	$106,165	—	—	—
C052	City	428	73	$70,374	—	—	—
C059	City	458	1	$106,165	—	—	—
C061	City	150	110	$105,716	—	—	—
C062	City	416	0	$89,035	—	—	—
C065	City	527	39	$85,319	—	—	—
C083	City	677	1	$81,606	—	—	—
C085	City	708	2	$89,797	—	—	—
C088	City	479	37	$70,374	—	—	—
C092	City	715	4	$59,353	—	—	—
C093	City	706	6	$76,266	—	—	—
C095	City	594	3	$60,321	—	—	—
C097	City	462	83	$106,165	—	—	—
C098	City	456	11	$86,555	—	—	—
R004	Rural	1,274	6	$89,797	—	—	—
R005	Rural	442	28	$145,041	—	—	—
R006	Rural	858	0	$89,797	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 21244 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

21207 — Lochearn CDP, MD (3.1 mi)
21133 — Randallstown CDP, MD (3.5 mi)
21163 — Randallstown CDP, MD (3.8 mi)
21208 — Pikesville CDP, MD (4.4 mi)
21228 — Catonsville CDP, MD (4.6 mi)
21215 — Baltimore city, MD (5.1 mi)
21043 — Ellicott City CDP, MD (5.6 mi)
21229 — Baltimore city, MD (5.8 mi)

Areas that include 21244

Woodlawn, MD ZIP codes — 3 ZIP codes
Milford Mill, MD ZIP codes — 1 ZIP code
Windsor Mill, MD ZIP codes — 1 ZIP code
Baltimore County ZIP codes — 54 ZIP codes
Maryland ZIP code data

Where it ranks

Mail every home in 21244

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) 21244, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 21244 in?: 21244 is a Windsor Mill, MD mailing address. By land area, 44% lies inside Milford Mill, 17% lies inside Woodlawn and 5% lies inside Randallstown; the rest is outside any Census-defined city or community.
What county is 21244 in?: 21244 is in Baltimore County.
What is the population of 21244?: About 38,208 people (±2,255), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 38,015.
What is the median household income in 21244?: $85,114 (±$9,140), 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 21244?: 28 USPS carrier routes with 15,420 residential and 867 business mailboxes (16,288 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 21244?: The closest, measured center to center: 21207 (3.1 mi, Lochearn), 21133 (3.5 mi, Randallstown), 21163 (3.8 mi, Randallstown), 21208 (4.4 mi, Pikesville), 21228 (4.6 mi, Catonsville) and 21215 (5.1 mi, Baltimore).

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