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/DC/SMALLEST-AREA

Smallest ZIP Codes in District of Columbia 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 20390 Washington District of Columbia 0.00 sq mi
2 20204 Washington District of Columbia 0.01 sq mi
3 20427 Washington District of Columbia 0.01 sq mi
4 20431 Washington District of Columbia 0.01 sq mi
5 20551 Washington District of Columbia 0.01 sq mi
6 20591 Washington District of Columbia 0.01 sq mi
7 20045 Washington District of Columbia 0.01 sq mi
8 20415 Washington District of Columbia 0.01 sq mi
9 20418 Washington District of Columbia 0.01 sq mi
10 20240 Washington District of Columbia 0.01 sq mi
11 20408 Washington District of Columbia 0.01 sq mi
12 20510 Washington District of Columbia 0.01 sq mi
13 20542 Washington District of Columbia 0.01 sq mi
14 20535 Washington District of Columbia 0.02 sq mi
15 20530 Washington District of Columbia 0.02 sq mi
16 20220 Washington District of Columbia 0.02 sq mi
17 20245 Washington District of Columbia 0.02 sq mi
18 20260 Washington District of Columbia 0.02 sq mi
19 20250 Washington District of Columbia 0.03 sq mi
20 20520 Washington District of Columbia 0.03 sq mi
21 20388 Washington Navy Yard District of Columbia 0.03 sq mi
22 20540 Washington District of Columbia 0.03 sq mi
23 20515 Washington District of Columbia 0.04 sq mi
24 20052 Washington District of Columbia 0.05 sq mi
25 20566 Washington District of Columbia 0.06 sq mi
26 20230 Washington District of Columbia 0.09 sq mi
27 20059 Washington District of Columbia 0.11 sq mi
28 20560 Washington District of Columbia 0.11 sq mi
29 20422 Washington District of Columbia 0.12 sq mi
30 20319 Washington District of Columbia 0.14 sq mi
31 20565 Washington District of Columbia 0.15 sq mi
32 20057 Washington District of Columbia 0.16 sq mi
33 20064 Washington District of Columbia 0.19 sq mi
34 20004 Washington District of Columbia 0.19 sq mi
35 20036 Washington District of Columbia 0.33 sq mi
36 20317 Washington District of Columbia 0.35 sq mi
37 20006 Washington District of Columbia 0.35 sq mi
38 20005 Washington District of Columbia 0.43 sq mi
39 20373 Naval Anacost Annex District of Columbia 0.51 sq mi
40 20037 Washington District of Columbia 0.73 sq mi
41 20010 Washington District of Columbia 1.00 sq mi
42 20009 Washington District of Columbia 1.32 sq mi
43 20001 Washington District of Columbia 2.05 sq mi
44 20012 Washington District of Columbia 2.06 sq mi
45 20024 Washington District of Columbia 2.19 sq mi
46 20017 Washington District of Columbia 2.22 sq mi
47 20003 Washington District of Columbia 2.27 sq mi
48 20018 Washington District of Columbia 3.02 sq mi
49 20008 Washington District of Columbia 3.09 sq mi
50 20007 Washington District of Columbia 3.09 sq mi

Showing the top 50 of 57 ZIP codes in District of Columbia that have this figure and meet the threshold above. 20390 ranks 1st at 0.00 sq mi, against 3.09 sq mi in 50th place.

Other rankings for District of Columbia

Cite this page

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

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