Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — CITY/MD/CATONSVILLE

Catonsville ZIP code, Maryland

The ZIP code for Catonsville, MD is 21228, and its area codes are 410, 443 and 667.

USPS city name
1 ZIP code
Overlapping the city
4 more
Population
43,368
Area codes
410, 443, 667

Mail addressed to Catonsville uses the ZIP code above. 4 more ZIP codes cover part of the city but are addressed as somewhere else; they are listed separately below.

Catonsville in numbers

About 43,368 people live in Catonsville, in 16,423 households, the 23rd-largest of Maryland's 527 census places. The median household income is $114,109 a year, 10% above the Maryland median of $103,678 (US: $80,734). The median owner-occupied home is valued at $416,900 (about the same as the Maryland median), and median gross rent is $1,724 a month. The median age is 39.2; 54.7% of adults 25 and over hold a bachelor's degree or higher (43.4% across Maryland); the average commute takes 25 minutes.

Population43,368Catonsville43,368
Households16,423Catonsville16,423
Median age39.2Catonsville39.2Maryland39.4US 38.9
Median household income$114,109Catonsville$114,109Maryland$103,678US $80,734
Median home value$416,900Catonsville$416,900Maryland$419,900US $332,700
Median gross rent$1,724Catonsville$1,724Maryland$1,705US $1,413
Bachelor's degree or higher54.7%Catonsville54.7%Maryland43.4%US 35.7%
Mean commute24.6 minCatonsville24.6 minMaryland31.1 minUS 26.4 min
Population density3,106 / sq miCatonsville3,106 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, for the census place Catonsville CDP. Survey estimates carry margins of error, wider for small places. Sources and methods.

ZIP codes addressed as Catonsville

ZIP codes with the USPS city name Catonsville
ZIP City Type Population Median income Median home
21228 Catonsville , MD Standard 50,492 $112,656 $404,700

Other ZIP codes overlapping Catonsville

These ZIP codes cover part of Catonsville but are addressed as somewhere else.

ZIP codes overlapping Catonsville
ZIP City Type Population Median income Median home
21043 Ellicott City , MD Standard 48,525 $148,125 $620,900
21227 Halethorpe , MD Standard 34,907 $85,986 $289,400
21229 Baltimore , MD Standard 46,679 $60,047 $201,300
21250 Baltimore , MD Standard 2,834 — —

Map of Catonsville ZIP codes

21228

The ZIP codes of Catonsville, MD, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Towns near Catonsville

The nearest larger towns are Ellicott City (75,257 people, 5.0 mi), Baltimore (573,243 people, 7.4 mi) and Columbia (104,338 people, 7.7 mi).

Towns near Catonsville
TownPopulationDistance
Woodlawn 40,379 2.9 mi
Arbutus 22,507 3.0 mi
Ilchester 28,364 3.5 mi
Lansdowne 7,876 4.6 mi
Elkridge 26,283 4.8 mi
Ellicott City 75,257 5.0 mi
Linthicum 11,313 5.6 mi
Lochearn 27,074 5.8 mi
Baltimore Highlands 8,206 5.9 mi
Milford Mill 30,829 6.0 mi
Brooklyn Park 16,067 7.2 mi
Baltimore 573,243 7.4 mi
Columbia 104,338 7.7 mi
Ferndale 17,529 7.9 mi

More nearby: every ZIP code in Baltimore County · Maryland ZIP codes

Cite this page

zipcodes.pro. “Catonsville, MD ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/md/catonsville

Underlying data is public domain or openly licensed — sources, vintages and licences.