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/DE/YOUNGEST

ZIP Codes With the Youngest Population in Delaware

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 19955 Kenton Kent 14.1
2 19717 Newark New Castle 19.3
3 19902 Dover Afb Kent 21.6
4 19901 Dover Kent 33.6
5 19953 Hartly Kent 33.6
6 19941 Ellendale Sussex 34.4
7 19711 Newark New Castle 34.7
8 19801 Wilmington New Castle 35.3
9 19805 Wilmington New Castle 35.5
10 19952 Harrington Kent 36.4
11 19802 Wilmington New Castle 36.8
12 19702 Newark New Castle 37.2
13 19734 Townsend New Castle 37.5
14 19956 Laurel Sussex 37.8
15 19947 Georgetown Sussex 37.9
16 19977 Smyrna Kent 38.1
17 19960 Lincoln Sussex 38.4
18 19980 Woodside Kent 38.4
19 19809 Wilmington New Castle 38.6
20 19703 Claymont New Castle 39.0
21 19713 Newark New Castle 39.0
22 19934 Camden Wyoming Kent 39.2
23 19938 Clayton Kent 39.4
24 19979 Viola Kent 39.6
25 19720 New Castle New Castle 39.7
26 19962 Magnolia Kent 39.7
27 19904 Dover Kent 39.8
28 19709 Middletown New Castle 40.2
29 19706 Delaware City New Castle 40.4
30 19964 Marydel Kent 40.5
31 19954 Houston Kent 41.2
32 19973 Seaford Sussex 41.3
33 19804 Wilmington New Castle 41.5
34 19933 Bridgeville Sussex 41.6
35 19940 Delmar Sussex 41.8
36 19701 Bear New Castle 42.1
37 19808 Wilmington New Castle 42.6
38 19963 Milford Sussex 42.7
39 19730 Odessa New Castle 43.7
40 19950 Greenwood Sussex 44.9
41 19943 Felton Kent 45.2
42 19810 Wilmington New Castle 45.3
43 19707 Hockessin New Castle 46.0
44 19803 Wilmington New Castle 46.4
45 19946 Frederica Kent 47.7
46 19806 Wilmington New Castle 50.3
47 19733 Saint Georges New Castle 51.2
48 19736 Yorklyn New Castle 53.5
49 19968 Milton Sussex 53.8
50 19966 Millsboro Sussex 53.9

Showing the top 50 of 65 ZIP codes in Delaware that have this figure . 19955 ranks 1st at 14.1, against 53.9 in 50th place.

Other rankings for Delaware

Cite this page

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

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