{"id":5907,"date":"2025-11-03T12:28:57","date_gmt":"2025-11-03T11:28:57","guid":{"rendered":"https:\/\/usemaps.com\/where-is-the-boundary-between-postal-codes\/"},"modified":"2026-01-15T10:44:34","modified_gmt":"2026-01-15T09:44:34","slug":"where-is-the-boundary-between-postal-codes","status":"publish","type":"post","link":"https:\/\/usemaps.com\/en\/where-is-the-boundary-between-postal-codes\/","title":{"rendered":"Where is the boundary between postal codes?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.linkedin.com\/search\/results\/all\/?keywords=%2330daymapchallenge&amp;origin=HASH_TAG_FROM_FEED\">#30DayMapChallenge<\/a> Day 3. Polygons. <\/p>\n\n<p class=\"wp-block-paragraph\">\ud83c\udf0e Polygons can be misleading. They seem natural because since childhood we look at administrative maps, where every piece of land belongs to a country, province, or municipality\u2026 That\u2019s why we like to represent many features this way. But not all data is suited for it.  <br\/><br\/>\u27a1\ufe0f An example?<br\/>A map of postal code areas. At first glance, everything looks fine\u2014but it\u2019s not. <br\/><br\/>In Poland, postal codes are managed by Poczta Polska, which maintains the &#8220;Register of Postal Address Numbers.&#8221; It\u2019s a document over 1,700 pages long, where every town or address is assigned a specific code. <br\/><br\/>So, a postal code is assigned to individual address points.<br\/><br\/>So, the boundary between address points runs\u2026 anywhere between two points with different postal codes. By convention, it\u2019s drawn in the middle, but that\u2019s just a convention. There\u2019s no such thing as an official boundary between postal codes.  <br\/><br\/>\u2753 Where does this cause difficulties?<br\/><br\/>Based on the coverage areas (polygons), it is impossible to accurately answer the often-asked question: What percentage of postal code X\u2019s area is covered by our delivery zone? According to the map below, even the reed beds along the Vistula are assigned a postal code.<br\/>The correctly phrased question is: What percentage of address points within a given postal code is served by our delivery zone? <br\/><br\/>Using Usemaps for such analyses, you\u2019ll always get the correct answer \ud83d\ude0e<br\/><br\/>Unfortunately, we don\u2019t know the answer to why Bydgoszcz has several hundred postal codes while Toru\u0144 has just one\u2026<\/p>\n\n<figure class=\"wp-block-image size-large has-custom-border\" style=\"margin-top:5rem;margin-right:5rem;margin-bottom:5rem;margin-left:5rem\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"512\" src=\"https:\/\/usemaps.com\/wp-content\/uploads\/2025\/11\/Gdzie-przebiega-granica-miedzy-kodami-pocztowymi-1024x512.jpeg\" alt=\"\" class=\"has-border-color wp-image-1804\" style=\"border-color:#b9b9b9;border-width:2px;border-radius:1rem\" srcset=\"https:\/\/usemaps.com\/wp-content\/uploads\/2025\/11\/Gdzie-przebiega-granica-miedzy-kodami-pocztowymi-1024x512.jpeg 1024w, https:\/\/usemaps.com\/wp-content\/uploads\/2025\/11\/Gdzie-przebiega-granica-miedzy-kodami-pocztowymi-300x150.jpeg 300w, https:\/\/usemaps.com\/wp-content\/uploads\/2025\/11\/Gdzie-przebiega-granica-miedzy-kodami-pocztowymi-768x384.jpeg 768w, https:\/\/usemaps.com\/wp-content\/uploads\/2025\/11\/Gdzie-przebiega-granica-miedzy-kodami-pocztowymi-1536x768.jpeg 1536w, https:\/\/usemaps.com\/wp-content\/uploads\/2025\/11\/Gdzie-przebiega-granica-miedzy-kodami-pocztowymi.jpeg 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>#30DayMapChallenge Day 3. Polygons. \ud83c\udf0e Polygons can be misleading. They seem natural because since childhood we look at administrative maps, where every piece of land belongs to a country, province, or municipality\u2026 That\u2019s why we like to represent many features this way. But not all data is suited for it. \u27a1\ufe0f An example?A map of [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[],"class_list":["post-5907","post","type-post","status-publish","format-standard","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Where is the boundary between postal codes? - Usemaps<\/title>\n<meta name=\"description\" content=\"#30DayMapChallenge Day 3. Polygons. \ud83c\udf0e Polygons can be misleading. 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