What city is 21075 in?

21075 is a Elkridge, MD mailing address. By land area, 50% lies inside Elkridge, 47% lies inside Ilchester and 2% lies inside Columbia.

What is the population of 21075?

About 37,363 people (±2,541), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 35,900.

What is the median household income in 21075?

$135,303 (±$7,369), 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 21075?

20 USPS carrier routes with 13,707 residential and 899 business mailboxes (14,609 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 21075?

The closest, measured center to center: 21076 (2.6 mi, Severn), 21077 (4.1 mi, Severn), 21045 (4.2 mi, Columbia), 21250 (4.2 mi, Catonsville), 20794 (4.3 mi, Jessup) and 21043 (4.5 mi, Ellicott City).

21075 ZIP Code, Elkridge, MD

21075 is a ZIP code in Elkridge, Maryland in Howard County. It covers 14 square miles of land. The closest ZIP codes are 21076, 21077 and 21045. 37,363 people live here in 13,038 households. At about 2,682 people per square mile it has suburban density, and owners and renters are mixed (64% own). Median household income is $135,303, above the Maryland median of $103,678; 43% of households have children under 18.

Quick facts

Mailing city: Elkridge, MD
County: Howard County
Land area: 14 sq mi
Population: 37,363
Median household income: $135,303
Carrier routes: 20 (13,707 homes)

Key figures

Measure	Value
Residents	37,363
Households	13,038
Median household income	$135,303
Income per person	$53,780
Median age	34.1
Homeowners	64.1%
Median home value	$455,300
Median rent	$2,183
Bachelor's degree or higher	59.9%
Average commute (minutes)	28.1
Households with kids under 18	42.7%
Moved in the past year	17.0%
Below the poverty line	7.7%
Broadband internet	97.8%
Speak a non-English language at home	28.3%

Household income

% of households	Value
<$10K	2.9%
$10–15K	1.5%
$15–25K	3.0%
$25–35K	2.7%
$35–50K	7.1%
$50–75K	10.9%
$75–100K	9.5%
$100–150K	19.0%
$150–200K	13.4%
$200K+	29.9%

Age

% of all residents	Value
<10	14.8%
10–19	14.9%
20–24	5.5%
25–34	17.6%
35–44	16.2%
45–54	11.8%
55–64	11.0%
65–74	5.6%
75+	2.7%

Tenure

% of housing units	Value
Owned, with mortgage	47.6%
Owned outright	14.8%
Rented	34.6%
Vacant	3.0%

Type of building

% of housing units	Value
Detached house	33.5%
Townhome	31.4%
2–4 units	2.8%
5–19 units	10.9%
20+ units	16.1%
Mobile / other	5.3%

Businesses in 21075

919 business establishments with 17,627 employees (ZIP Codes Business Patterns 2023).

Professional, Scientific, and Technical Services: 156
Construction: 102
Retail Trade: 92
Health Care and Social Assistance: 88
Other Services (except Public Administration): 81
Wholesale Trade: 78
Administrative and Support and Waste Management and Remediation Services: 65
Accommodation and Food Services: 62

EDDM carrier routes

21075 has 20 USPS carrier routes with 13,707 residential and 899 business mailboxes. Open the EDDM route map.

Carrier routes in 21075

21075 has 20 USPS carrier routes (20 city (C)) with 13,707 residential and 899 business mailboxes. Routes range from 332 homes (C043) to 1,034 homes (C058); the median route has 634 homes. The Census counted 13,038 households in 21075 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	0
250–499	3
500–749	10
750–999	6
1,000–1,499	1
1,500+	0

Best routes in 21075 for…

Most businesses

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

Route C043 — USPS business mailboxes 216, 332 homes
Route C034 — USPS business mailboxes 130, 736 homes
Route C027 — USPS business mailboxes 97, 489 homes
Route C056 — USPS business mailboxes 92, 628 homes
Route C039 — USPS business mailboxes 70, 802 homes

Select these 5 routes on the route map

Every carrier route in 21075

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
C004	City	872	29	$157,359	—	—	—
C014	City	600	7	$137,681	—	—	—
C020	City	603	65	$168,006	—	—	—
C022	City	537	49	$150,135	—	—	—
C024	City	801	2	$140,067	—	—	—
C027	City	489	97	$140,067	—	—	—
C034	City	736	130	$112,112	—	—	—
C037	City	624	2	$84,388	—	—	—
C039	City	802	70	$103,067	—	—	—
C040	City	640	49	$131,188	—	—	—
C043	City	332	216	$152,700	—	—	—
C044	City	641	9	$103,067	—	—	—
C046	City	538	2	$137,681	—	—	—
C047	City	966	18	$112,112	—	—	—
C049	City	995	5	$112,112	—	—	—
C053	City	418	5	$137,681	—	—	—
C056	City	628	92	$168,006	—	—	—
C057	City	932	2	$51,722	—	—	—
C058	City	1,034	46	$112,112	—	—	—
C059	City	519	4	$192,471	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 21075 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

21076 — Severn CDP, MD (2.6 mi)
21077 — Severn CDP, MD (4.1 mi)
21045 — Columbia CDP, MD (4.2 mi)
21250 — Catonsville CDP, MD (4.2 mi)
20794 — Jessup CDP, MD (4.3 mi)
21043 — Ellicott City CDP, MD (4.5 mi)
21090 — Linthicum CDP, MD (4.6 mi)
21227 — Arbutus CDP, MD (4.6 mi)

Areas that include 21075

Where it ranks

Mail every home in 21075

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) 21075, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 21075 in?: 21075 is a Elkridge, MD mailing address. By land area, 50% lies inside Elkridge, 47% lies inside Ilchester and 2% lies inside Columbia.
What county is 21075 in?: 21075 is in Howard County.
What is the population of 21075?: About 37,363 people (±2,541), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 35,900.
What is the median household income in 21075?: $135,303 (±$7,369), 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 21075?: 20 USPS carrier routes with 13,707 residential and 899 business mailboxes (14,609 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 21075?: The closest, measured center to center: 21076 (2.6 mi, Severn), 21077 (4.1 mi, Severn), 21045 (4.2 mi, Columbia), 21250 (4.2 mi, Catonsville), 20794 (4.3 mi, Jessup) and 21043 (4.5 mi, Ellicott City).

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