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 — RANKINGS/MD/YOUNGEST

ZIP Codes With the Youngest Population in Maryland

What this measures. Median age of residents, lowest first. Source: Census American Community Survey, data release 2026-10-12.

# ZIP City County Median age
1 20742 College Park Prince George's 19.0
2 21010 Gunpowder Harford 19.3
3 21251 Baltimore Baltimore city 19.5
4 21250 Baltimore Baltimore 19.9
5 21252 Towson Baltimore 20.0
6 20686 Saint Marys City St. Mary's 20.3
7 21402 Annapolis Anne Arundel 21.0
8 21130 Perryman Harford 21.7
9 20889 Bethesda Montgomery 21.9
10 21781 Saint James Washington 21.9
11 20670 Patuxent River St. Mary's 22.9
12 20740 College Park Prince George's 23.5
13 20762 Andrews Air Force Base Prince George's 24.4
14 20755 Fort George G Meade Anne Arundel 25.1
15 21542 Midland Allegany 26.7
16 21052 Fort Howard Baltimore 27.8
17 21727 Emmitsburg Frederick 29.5
18 21790 Tuscarora Frederick 29.5
19 21077 Harmans Anne Arundel 29.9
20 21913 Cecilton Cecil 29.9
21 20701 Annapolis Junction Howard 30.4
22 20608 Aquasco Prince George's 30.8
23 21766 Little Orleans Allegany 30.8
24 21543 Midlothian Allegany 30.9
25 21872 Whaleyville Worcester 31.5
26 20710 Bladensburg Prince George's 31.7
27 20737 Riverdale Prince George's 31.7
28 20634 Great Mills St. Mary's 32.0
29 21210 Baltimore Baltimore city 32.0
30 21804 Salisbury Wicomico 32.6
31 21231 Baltimore Baltimore city 32.7
32 20783 Hyattsville Prince George's 32.8
33 21071 Glyndon Baltimore 33.0
34 21005 Aberdeen Proving Ground Harford 33.1
35 21826 Fruitland Wicomico 33.2
36 20680 Ridge St. Mary's 33.6
37 21201 Baltimore Baltimore city 33.6
38 21226 Curtis Bay Baltimore city 33.6
39 21762 Libertytown Frederick 33.6
40 21155 Upperco Baltimore 33.7
41 21202 Baltimore Baltimore city 33.7
42 21853 Princess Anne Somerset 33.7
43 21230 Baltimore Baltimore city 33.9
44 21664 Secretary Dorchester 34.0
45 21075 Elkridge Howard 34.1
46 20602 Waldorf Charles 34.2
47 20770 Greenbelt Prince George's 34.2
48 21225 Brooklyn Anne Arundel 34.2
49 20903 Silver Spring Montgomery 34.3
50 21224 Baltimore Baltimore city 34.3

Showing the top 50 of 464 ZIP codes in Maryland that have this figure . 20742 ranks 1st at 19.0, against 34.3 in 50th place.

Other rankings for Maryland

Cite this page

zipcodes.pro. “ZIP Codes With the Youngest Population in Maryland.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/md/youngest

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