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/SMALLEST-AREA

Smallest ZIP Codes in Delaware by Land Area

What this measures. Land area of the Census tabulation area, smallest first. These are almost always dense urban ZIP codes covering a few city blocks. Source: Census Gazetteer, data release 2026-10-12.

# ZIP City County Land area
1 19955 Kenton Kent 0.10 sq mi
2 19733 Saint Georges New Castle 0.11 sq mi
3 19736 Yorklyn New Castle 0.15 sq mi
4 19936 Cheswold Kent 0.21 sq mi
5 19980 Woodside Kent 0.23 sq mi
6 19717 Newark New Castle 0.26 sq mi
7 19735 Winterthur New Castle 0.45 sq mi
8 19710 Montchanin New Castle 0.48 sq mi
9 19716 Newark New Castle 0.62 sq mi
10 19730 Odessa New Castle 0.68 sq mi
11 19931 Bethel Sussex 1.19 sq mi
12 19944 Fenwick Island Sussex 1.24 sq mi
13 19967 Millville Sussex 1.62 sq mi
14 19806 Wilmington New Castle 1.71 sq mi
15 19732 Rockland New Castle 1.76 sq mi
16 19731 Port Penn New Castle 2.53 sq mi
17 19706 Delaware City New Castle 2.53 sq mi
18 19979 Viola Kent 3.28 sq mi
19 19802 Wilmington New Castle 3.48 sq mi
20 19902 Dover Afb Kent 3.95 sq mi
21 19703 Claymont New Castle 3.97 sq mi
22 19801 Wilmington New Castle 4.40 sq mi
23 19805 Wilmington New Castle 5.52 sq mi
24 19930 Bethany Beach Sussex 5.85 sq mi
25 19809 Wilmington New Castle 6.76 sq mi
26 19804 Wilmington New Castle 7.18 sq mi
27 19810 Wilmington New Castle 7.90 sq mi
28 19964 Marydel Kent 8.12 sq mi
29 19951 Harbeson Sussex 8.93 sq mi
30 19970 Ocean View Sussex 9.33 sq mi
31 19954 Houston Kent 9.77 sq mi
32 19803 Wilmington New Castle 12.66 sq mi
33 19713 Newark New Castle 13.00 sq mi
34 19707 Hockessin New Castle 13.18 sq mi
35 19808 Wilmington New Castle 13.75 sq mi
36 19962 Magnolia Kent 14.61 sq mi
37 19971 Rehoboth Beach Sussex 17.96 sq mi
38 19807 Wilmington New Castle 18.17 sq mi
39 19946 Frederica Kent 23.07 sq mi
40 19975 Selbyville Sussex 25.54 sq mi
41 19939 Dagsboro Sussex 25.97 sq mi
42 19701 Bear New Castle 26.57 sq mi
43 19711 Newark New Castle 27.41 sq mi
44 19702 Newark New Castle 28.09 sq mi
45 19953 Hartly Kent 29.90 sq mi
46 19960 Lincoln Sussex 30.29 sq mi
47 19941 Ellendale Sussex 30.29 sq mi
48 19720 New Castle New Castle 38.30 sq mi
49 19940 Delmar Sussex 41.31 sq mi
50 19904 Dover Kent 43.19 sq mi

Showing the top 50 of 68 ZIP codes in Delaware that have this figure and meet the threshold above. 19955 ranks 1st at 0.10 sq mi, against 43.19 sq mi in 50th place.

Other rankings for Delaware

Cite this page

zipcodes.pro. “Smallest ZIP Codes in Delaware by Land Area.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/de/smallest-area

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