CA postcode district map, Carlisle

Where the CA districts sit

6 districts are plotted without a label where labels would overlap; every one is in the table below.

Where CA sits

It falls across Cumberland, Westmorland and Furness and Northumberland.

Water supply across CA

All 29 CA districts are supplied by United Utilities, which is notable at this size: an area with this many districts usually crosses at least one supply boundary, and this one does not.

No hosepipe ban currently applies anywhere in CA.

The shape of the CA area

The districts are wildly uneven: CA14 holds 1,308 postcodes around Workington and CA95 holds 4, a ratio of about 327 to one. They divide into 77 sectors.

The numbering is not continuous. CA runs up to 95 but has only 29 districts, so 66 numbers are unused:.

Several districts share a settlement, which is a common source of confusion when a form rejects an address: CA1, CA2, CA3, CA4 and CA5 all point at Carlisle, CA19, CA20, CA21, CA22 and CA27 all point at Egremont and CA23, CA24, CA25 and CA26 all point at Cleator Moor.

What borders CA

CA sits next to LA (Lancaster) to the south, DG (Dumfries) to the north west, DL (Darlington) to the east, DH (Durham) to the east and NE (Newcastle upon Tyne) to the north east.

Its neighbours run in 4 different directions, so CA is landlocked by other postcode areas on most sides.

CA districts, settlements and water supply

Principal settlement is the town or city each district sits in or nearest to, derived from OS Open Names. It is not the Royal Mail post town, which is licensed data and not published openly. Status is resolved live from each company’s own notice.

Water hardness in CA

No water company covering CA publishes hardness figures as open data. The gap is named per district below so you know who to ask.

United Utilities does not publish hardness as open data, but does publish a water hardness factsheet with a full band table and a postcode water quality checker.

Hardness is published per census area, not per postcode, so these figures characterise a district rather than measuring one address. They are a scale and taste matter, not a safety one. Hardness data version wessex-water@2022-2025+yorkshire-water@2026.

Download the CA data

No signup, no email wall. GeoJSON carries the district points, the supplier and the live status, so it can be dropped straight into a map.

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District positions are averaged postcode centroids from OS Code-Point Open. They show roughly where a district sits, not where its boundary runs, and are not legal boundaries.

Frequently asked questions