21228 ZIP Code, Catonsville, MD

21228 is a ZIP code in Catonsville, Maryland in Baltimore County. It covers 16 square miles of land. The closest ZIP codes are 21250, 21043 and 21229. 50,492 people live here in 19,788 households, more than in 9 of every 10 Maryland ZIP codes. At about 3,241 people per square mile it has suburban density, and most homes are owner-occupied (71%). Median household income is $112,656, close to the Maryland median of $103,678.

Quick facts

Key figures

MeasureValue
Residents50,492
Households19,788
Median household income$112,656
Income per person$54,810
Median age42.2
Homeowners71.0%
Median home value$404,700
Median rent$1,701
Bachelor's degree or higher52.5%
Average commute (minutes)25.4
Households with kids under 1828.0%
Moved in the past year12.3%
Below the poverty line8.1%
Broadband internet89.0%
Speak a non-English language at home21.5%

Household income

% of householdsValue
<$10K4.0%
$10–15K1.6%
$15–25K3.9%
$25–35K4.2%
$35–50K6.7%
$50–75K12.9%
$75–100K11.2%
$100–150K21.5%
$150–200K13.7%
$200K+20.2%

Age

% of all residentsValue
<1011.4%
10–1911.8%
20–245.7%
25–3411.4%
35–4413.7%
45–549.5%
55–6414.1%
65–7411.6%
75+10.9%

Tenure

% of housing unitsValue
Owned, with mortgage49.8%
Owned outright19.4%
Rented27.5%
Vacant3.3%

Type of building

% of housing unitsValue
Detached house54.8%
Townhome16.6%
2–4 units4.9%
5–19 units12.6%
20+ units11.0%
Mobile / other0.1%

Businesses in 21228

1,191 business establishments with 17,358 employees (ZIP Codes Business Patterns 2023).

EDDM carrier routes

21228 has 45 USPS carrier routes with 19,846 residential and 1,211 business mailboxes. Open the EDDM route map.

Carrier routes in 21228

21228 has 45 USPS carrier routes (45 city (C)) with 19,846 residential and 1,211 business mailboxes. Routes range from 68 homes (C060) to 684 homes (C057); the median route has 450 homes. The Census counted 19,788 households in 21228 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per routeRoutes
1–2492
250–49932
500–74911
750–9990
1,000–1,4990
1,500+0

Best routes in 21228 for…

Most businesses

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

  1. Route C018 — USPS business mailboxes 212, 207 homes
  2. Route C021 — USPS business mailboxes 109, 352 homes
  3. Route C015 — USPS business mailboxes 108, 330 homes
  4. Route C003 — USPS business mailboxes 94, 450 homes
  5. Route C032 — USPS business mailboxes 93, 342 homes

Select these 5 routes on the route map

Every carrier route in 21228

RouteTypeHomesBusinessesEst. median incomeEst. ownersEst. families with kidsEst. moved in past year
C001City46039$85,425———
C002City3752$177,120———
C003City45094$123,704———
C004City59719$85,425———
C006City49914$164,126———
C007City5460$136,280———
C008City53266$81,877———
C009City3877$61,029———
C011City36715$126,971———
C012City5372$111,966———
C014City52843$107,294———
C015City330108$81,877———
C016City38653$150,889———
C017City34251$90,995———
C018City207212$126,971———
C020City5211$100,643———
C021City352109$78,911———
C023City67447$168,104———
C024City3560$177,120———
C025City5687$61,497———
C026City48710$168,104———
C027City3852$131,341———
C028City4122$164,126———
C029City35661$134,324———
C030City4967$100,643———
C032City34293$99,813———
C033City4780$69,218———
C035City4163$164,126———
C036City3690$122,745———
C037City46949$111,966———
C038City4802$123,704———
C041City4920$115,884———
C042City4351$81,877———
C043City59527$100,643———
C045City4203$122,745———
C047City4211$177,120———
C048City3215$177,120———
C049City4623$107,294———
C050City3481$122,745———
C051City44843$65,031———
C052City4501$69,218———
C057City6844$41,148———
C058City4900$60,216———
C059City5084$90,995———
C060City680$150,889———

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 21228 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

Areas that include 21228

Where it ranks

Mail every home in 21228

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) 21228, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 21228 in?
21228 is a Catonsville, MD mailing address. By land area, 77% lies inside Catonsville and 23% lies inside Woodlawn.
What county is 21228 in?
21228 is in Baltimore County.
What is the population of 21228?
About 50,492 people (±2,166), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 50,418.
What is the median household income in 21228?
$112,656 (±$5,049), 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 21228?
45 USPS carrier routes with 19,846 residential and 1,211 business mailboxes (21,058 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 21228?
The closest, measured center to center: 21250 (2.3 mi, Catonsville), 21043 (3.1 mi, Ellicott City), 21229 (3.1 mi, Baltimore), 21207 (3.9 mi, Lochearn), 21227 (4.3 mi, Arbutus) and 21244 (4.6 mi, Milford Mill).

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