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/OLDEST

ZIP Codes With the Oldest Population in District of Columbia

What this measures. Median age of residents, ACS 5-year estimate. Source: Census American Community Survey, data release 2026-10-12.

# ZIP City County Median age
1 20422 Washington District of Columbia 55.3
2 20015 Washington District of Columbia 45.7
3 20016 Washington District of Columbia 42.7
4 20004 Washington District of Columbia 42.2
5 20012 Washington District of Columbia 40.2
6 20018 Washington District of Columbia 39.6
7 20008 Washington District of Columbia 39.2
8 20007 Washington District of Columbia 38.3
9 20011 Washington District of Columbia 38.0
10 20017 Washington District of Columbia 36.9
11 20024 Washington District of Columbia 35.5
12 20036 Washington District of Columbia 35.1
13 20005 Washington District of Columbia 34.9
14 20003 Washington District of Columbia 34.7
15 20009 Washington District of Columbia 34.4
16 20019 Washington District of Columbia 34.4
17 20032 Washington District of Columbia 34.3
18 20020 Washington District of Columbia 33.7
19 20002 Washington District of Columbia 33.4
20 20010 Washington District of Columbia 33.2
21 20001 Washington District of Columbia 32.6
22 20037 Washington District of Columbia 30.4
23 20006 Washington District of Columbia 24.5
24 20319 Washington District of Columbia 23.1
25 20390 Washington District of Columbia 22.2
26 20373 Naval Anacost Annex District of Columbia 20.3
27 20057 Washington District of Columbia 19.7
28 20064 Washington District of Columbia 19.7
29 20052 Washington District of Columbia 19.6
30 20059 Washington District of Columbia 19.0

Showing the top 30 of 30 ZIP codes in District of Columbia that have this figure . 20422 ranks 1st at 55.3, against 19.0 in 30th place.

Other rankings for District of Columbia

Cite this page

zipcodes.pro. “ZIP Codes With the Oldest Population in District of Columbia.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/dc/oldest

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