BN99 postcode district: Lancing and Sompting and around, West Sussex

BN99 is a postcode district in West Sussex, with 492 postcodes in use in 5 sectors. It has postcodes in Lancing and Sompting and Worthing. It is split between 2 councils: Adur (333 postcodes) and Worthing (159).

Postcodes in use: 492
Sectors: 5
Councils: 2 councils
Places: 2 places

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026. See all our data sources

Every postcode in BN99, by flood risk

A home or business at high risk: 0
At medium risk at worst: 0
At low risk at worst: 1
At very low risk only: 0
Not on the at-risk list: 491

Of the 492 postcodes in BN99 that ONS places, 1 are at low risk at worst and 491 are not on the Environment Agency's at-risk list.

Each mark is a postcode's centre point as ONS gives it, not a building. Press one to see its postcode and open its page. No boundary is drawn. Where marks overlap, the one first in the key is drawn; the counts include every postcode.

The middle of its postcodes: latitude 50.8237, longitude -0.3560. Open this area on OpenStreetMap

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026, the centre point of each postcode; flood risk: Environment Agency, published 6 July 2026; roads, rivers and built-up areas: Contains OS data © Crown copyright and database right 2026. Drawn by us. Street map: Ordnance Survey, OS Open Zoomstack, Open Government Licence v3.0, drawn with MapLibre. How we use them

What broadband can you get in BN99?

Ofcom reports on 2 of the 492 postcodes in BN99. At 2 of them every home and business can get gigabit broadband.

Postcodes where every home can get gigabit2 of 2

Postcodes where every home can get superfast2 of 2

Ofcom gives each postcode's share of homes and businesses, not how many there are, so these count postcodes. Each postcode page has its own figures. A provider's checker answers for one address.

Check one address on Ofcom's checker

Source: Ofcom, Connected Nations, Spring 2026, data for January 2026, Open Government Licence v3.0. How we use it

Is BN99 at risk of flooding?

1 of the 492 postcodes in BN99 has a home or business in an area at risk of flooding from rivers or the sea, the Environment Agency says. At those, it puts none of the homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 1 of 492 postcodes Low: 1

High: 3.3% or more a year (1 in 30). Medium: 1% to 3.3% a year. Low: 0.1% to 1% a year. Very low: under 0.1% a year (1 in 1,000). Each band is the chance of flooding in any one year.

Homes and businesses in an area at risk of flooding from rivers or the sea, as the Environment Agency counts them, added up over the postcodes. It is for the land, not each building, and leaves out surface water, groundwater and sewers. Each postcode page has its own figures and its flood warning areas.

Source: Environment Agency, Risk of Flooding from Rivers and Sea (postcodes in areas at risk), published 6 July 2026, Open Government Licence v3.0. How we use it