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Your Post Code Is the Directions, Not the Destination

CGP Grey · 3.9M views · 2025-01-28 · 7:49

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Overview

CGP Grey explains that postal codes are routing instructions for mail rather than geographic regions. He looks at the quirks and problems this causes.

On Hacker News

HN recommends it whenever zip codes, addresses or geospatial data come up, as a clear explanation of the hidden pattern in post codes.

Recommended by 4 HN people across 4 months · HN mentions 2025–2025

Topics

Business & economics (other)Ideas & learning (other)
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zip codesaddressesgeographypostal systemcgp grey

What people said

cogman10 · 2025-09 · Strong recommendation

If you find this interesting and you haven't watched it, Go watch "The hidden pattern in post codes" [1] [1] [VIDEO]

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Arnavion · 2025-05 · Recommendation

See also this CGP Grey video where he talks about post codes / zip codes in general and mentions Ireland's system. [VIDEO]

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schlauerfox · 2025-04 · Recommendation

CGP Grey, a youtube channel, has a video on some of the problems of the postal codes and addresses from earlier this year that I learned about alternates to my familiar US based system. [VIDEO]

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Sources

Video by CGP Grey, played through YouTube.

Data and selection notes

HN summaries and labels may contain AI errors. HN dates refer to discussions, not video publication.

HN Library: HackerTube export (2026-10-31) and open-index/hacker-news. Upstream summaries and classifications may contain AI errors.

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