LN postcode district map, Lincoln
Supplier statuses last checked .
The LN postcode area covers 13 districts and 9,575 live postcodes, from LN1 to LN13. It is centred on North Hykeham and also covers Lincoln, Woodhall Spa, Louth, Mablethorpe and Market Rasen.
Districts here average 737 postcodes.
Where the LN districts sit
Where LN sits
It is administratively fragmented, reaching into Lincolnshire, Nottinghamshire, North East Lincolnshire and North Lincolnshire and 0 other authorities.
Water supply across LN
All 13 LN districts are supplied by Anglian Water. That makes LN simple in a way many areas are not: one company, one set of rules, one status to check.
Anglian Water has a hosepipe ban in force from 11 July 2026, covering the whole of LN.
The shape of the LN area
LN6 is the largest district with 1,486 postcodes around North Hykeham, and LN10 the smallest with 206. The area divides into 52 postcode sectors.
District by district: LN1 serves Lincoln, LN2 serves Lincoln, LN3 serves Lincoln, LN4 serves Woodhall Spa, LN5 serves North Hykeham, LN6 serves North Hykeham, LN7 serves Brigg, LN8 serves Market Rasen, LN9 serves Horncastle, LN10 serves Woodhall Spa, LN11 serves Louth, LN12 serves Mablethorpe and LN13 serves Mablethorpe.
Several districts share a settlement, which is a common source of confusion when a form rejects an address: LN1, LN2 and LN3 all point at Lincoln, LN4 and LN10 all point at Woodhall Spa and LN5 and LN6 all point at North Hykeham.
What borders LN
LN sits next to DN (Doncaster) to the north west, HU (Kingston upon Hull) to the north, NG (Nottingham) to the south west, PE (Peterborough) to the south and S (Sheffield) to the west.
Its neighbours run in 5 different directions, so LN is landlocked by other postcode areas on most sides.
LN districts, settlements and water supply
| District | Principal settlement | Water company | Hosepipe ban status |
|---|---|---|---|
| LN1 | Lincoln | Anglian Water | Ban in force |
| LN2 | Lincoln | Anglian Water | Ban in force |
| LN3 | Lincoln | Anglian Water | Ban in force |
| LN4 | Woodhall Spa | Anglian Water | Ban in force |
| LN5 | North Hykeham | Anglian Water | Ban in force |
| LN6 | North Hykeham | Anglian Water | Ban in force |
| LN7 | Brigg | Anglian Water | Ban in force |
| LN8 | Market Rasen | Anglian Water | Ban in force |
| LN9 | Horncastle | Anglian Water | Ban in force |
| LN10 | Woodhall Spa | Anglian Water | Ban in force |
| LN11 | Louth | Anglian Water | Ban in force |
| LN12 | Mablethorpe | Anglian Water | Ban in force |
| LN13 | Mablethorpe | Anglian Water | Ban in force |
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 LN
No water company covering LN publishes hardness figures as open data. The gap is named per district below so you know who to ask.
| District | Hardness | As published | Supply zone | Published by |
|---|---|---|---|---|
| LN1 | Not published by Anglian Water. Check with your supplier. | |||
| LN2 | Not published by Anglian Water. Check with your supplier. | |||
| LN3 | Not published by Anglian Water. Check with your supplier. | |||
| LN4 | Not published by Anglian Water. Check with your supplier. | |||
| LN5 | Not published by Anglian Water. Check with your supplier. | |||
| LN6 | Not published by Anglian Water. Check with your supplier. | |||
| LN7 | Not published by Anglian Water. Check with your supplier. | |||
| LN8 | Not published by Anglian Water. Check with your supplier. | |||
| LN9 | Not published by Anglian Water. Check with your supplier. | |||
| LN10 | Not published by Anglian Water. Check with your supplier. | |||
| LN11 | Not published by Anglian Water. Check with your supplier. | |||
| LN12 | Not published by Anglian Water. Check with your supplier. | |||
| LN13 | Not published by Anglian Water. Check with your supplier. | |||
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 LN 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.
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
How many postcode districts are in the LN area?
There are 13 LN postcode districts, running from LN1 to LN13, and they contain 9,575 live postcodes across 52 sectors.
What towns does the LN postcode area cover?
LN covers North Hykeham, Lincoln, Woodhall Spa, Louth, Mablethorpe and Market Rasen. The area takes its name from North Hykeham, and each district is listed with its settlement in the table on this page.
Which water company supplies LN postcodes?
Anglian Water supplies all 13 LN districts. Supply boundaries follow the pipe network rather than postcode geography, so confirm against your water bill if you are near the edge of the area.
Why do LN1 and LN2 both say Lincoln?
LN1, LN2 and LN3 all serve Lincoln, covering different parts of it. A single town routinely needs more than one postcode district once it passes a few thousand delivery points, so this is normal rather than an error in an address.
Can I download a free LN postcode map?
Yes. This page offers the LN districts as GeoJSON, CSV and SVG, free and with no signup or email address required. The GeoJSON carries each district's position, its water company and its current restriction status, so it can be dropped straight into a mapping tool.
Why is the LN area called Lincoln when it covers North Hykeham?
LN takes its letters from Lincoln, where the sorting office that served the area was based when the code was allocated. North Hykeham is the largest settlement in the area today, in LN6, but the area code follows the historic sorting geography rather than current population.
Which councils cover the LN postcode area?
LN reaches into Lincolnshire, Nottinghamshire, North East Lincolnshire and North Lincolnshire. A postcode area is not a council area: they were drawn for different purposes and a single district can sit across a council boundary, so your postcode does not tell you which authority you pay.