Geocode cells of Geohash, with 8 (blue) and 9 (yellow) digits, a typical hierarchical grid, comparing with latitude-longitude (12 or more digits). A museum is a typical location to be pointed by a geocode, its gate need ~20 meters of precision.

ONS codes are geocodes maintained by the United Kingdom's Office for National Statistics to represent a wide range of geographical areas of the UK, for use in tabulating census and other statistical data.

- ONS coding system

Where data is broken down by geographical area, this is usually done by the areas defined in the ONS geographical coding system.

- Office for National Statistics

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