Data for small areas (Middle Super Output Areas) available from the Office for National Statistics.   Enter a postcode to see the average household income for the local area (MSOA level).

Mean average equivalised disposable annual household income, before and after housing costs, for local areas (MSOAs), financial year ending March 2023, England and Wales

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Mean average equivalised disposable annual household income, before housing costs, for local areas (MSOAs), financial year ending March 2023, England and Wales

Mean average equivalised disposable annual household income, after housing costs, for local areas (MSOAs), financial year ending March 2023, England and Wales

full article available here:
Income estimates for small areas, England and Wales – Office for National Statistics