CH99 postcode district: Chester and around

CH99 is a postcode district in England, with 17 postcodes in use in 1 sector. It has postcodes in Chester. Its council is Cheshire West and Chester.

Postcodes in use
17
Sectors
1
Council
Cheshire West and Chester
Places
Chester

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

Every postcode in CH99, by flood risk

Map of every postcode in CH99, by flood risk Of the 17 postcodes in CH99 that ONS places, 17 are not on the Environment Agency's at-risk list. Places named: Chester. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A55A483 CH99 9AA: not on the flood risk listCH99 9AB: not on the flood risk listCH99 9DS: not on the flood risk listCH99 9NA: not on the flood risk list Chester Map of every postcode in CH99, by flood risk Of the 17 postcodes in CH99 that ONS places, 17 are not on the Environment Agency's at-risk list. Places named: Chester. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A548A483A55 Chester
  • A home or business at high risk: 0
  • At medium risk at worst: 0
  • At low risk at worst: 0
  • At very low risk only: 0
  • Not on the at-risk list: 17

Of the 17 postcodes in CH99 that ONS places, 17 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 53.1751, longitude -2.8955. 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

Is CH99 at risk of flooding?

None of the 17 postcodes in CH99 is on the Environment Agency's list of postcodes with a home or business in an area at risk of flooding from rivers or the sea.

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

Postcodes in CH99

Pick a sector, then a postcode. A sector is the district plus the next digit.

CH99 917 postcodes
UK postcode format explained

Places in CH99

Towns and villages with postcodes in CH99, and how many each has here.

Chester postcodes,17

Who covers CH99

How many of the district's postcodes in use fall under each council, constituency and police force area.

Councils

What council am I in?

Constituencies

  • Chester South and Eddisbury11
  • Chester North and Neston6

Police force areas

  • Cheshire17

Next to CH99

CH90 postcode district All CH districts Chester postcodes

"Next to" is by number: the district before CH99 in the CH area.

Check a postcode

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