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/LARGEST-AREA

Largest ZIP Codes in Delaware by Land Area

What this measures. Land area of the Census tabulation area, in square miles. Water is excluded. Source: Census Gazetteer, data release 2026-10-12.

# ZIP City County Land area
1 19947 Georgetown Sussex 119.22 sq mi
2 19963 Milford Sussex 105.12 sq mi
3 19956 Laurel Sussex 100.40 sq mi
4 19952 Harrington Kent 90.96 sq mi
5 19966 Millsboro Sussex 89.08 sq mi
6 19973 Seaford Sussex 83.99 sq mi
7 19977 Smyrna Kent 83.11 sq mi
8 19734 Townsend New Castle 79.86 sq mi
9 19709 Middletown New Castle 77.65 sq mi
10 19901 Dover Kent 75.80 sq mi
11 19950 Greenwood Sussex 72.39 sq mi
12 19933 Bridgeville Sussex 67.26 sq mi
13 19968 Milton Sussex 63.90 sq mi
14 19943 Felton Kent 62.44 sq mi
15 19945 Frankford Sussex 62.32 sq mi
16 19938 Clayton Kent 48.21 sq mi
17 19958 Lewes Sussex 47.27 sq mi
18 19934 Camden Wyoming Kent 46.59 sq mi
19 19904 Dover Kent 43.19 sq mi
20 19940 Delmar Sussex 41.31 sq mi
21 19720 New Castle New Castle 38.30 sq mi
22 19941 Ellendale Sussex 30.29 sq mi
23 19960 Lincoln Sussex 30.29 sq mi
24 19953 Hartly Kent 29.90 sq mi
25 19702 Newark New Castle 28.09 sq mi
26 19711 Newark New Castle 27.41 sq mi
27 19701 Bear New Castle 26.57 sq mi
28 19939 Dagsboro Sussex 25.97 sq mi
29 19975 Selbyville Sussex 25.54 sq mi
30 19946 Frederica Kent 23.07 sq mi
31 19807 Wilmington New Castle 18.17 sq mi
32 19971 Rehoboth Beach Sussex 17.96 sq mi
33 19962 Magnolia Kent 14.61 sq mi
34 19808 Wilmington New Castle 13.75 sq mi
35 19707 Hockessin New Castle 13.18 sq mi
36 19713 Newark New Castle 13.00 sq mi
37 19803 Wilmington New Castle 12.66 sq mi
38 19954 Houston Kent 9.77 sq mi
39 19970 Ocean View Sussex 9.33 sq mi
40 19951 Harbeson Sussex 8.93 sq mi
41 19964 Marydel Kent 8.12 sq mi
42 19810 Wilmington New Castle 7.90 sq mi
43 19804 Wilmington New Castle 7.18 sq mi
44 19809 Wilmington New Castle 6.76 sq mi
45 19930 Bethany Beach Sussex 5.85 sq mi
46 19805 Wilmington New Castle 5.52 sq mi
47 19801 Wilmington New Castle 4.40 sq mi
48 19703 Claymont New Castle 3.97 sq mi
49 19902 Dover Afb Kent 3.95 sq mi
50 19802 Wilmington New Castle 3.48 sq mi

Showing the top 50 of 68 ZIP codes in Delaware that have this figure and meet the threshold above. 19947 ranks 1st at 119.22 sq mi, against 3.48 sq mi in 50th place.

Other rankings for Delaware

Cite this page

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

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