Deprivation rankings

What this answers: What share of Portsmouth's neighbourhoods are among the most deprived 20% in England on the 2025 Index of Multiple Deprivation?

Definition: Share of 2021 Lower layer Super Output Areas in the area whose 2025 Index of Multiple Deprivation rank puts them in decile 1 or 2 for England (1 = most deprived). Counted from the published LSOA deciles in File 1. Ward values use the ONS best-fit LSOA (2021) to ward (May 2024) lookup: each neighbourhood counts wholly in one ward.

• The Index of Multiple Deprivation ranks every small area in England against every other. It shows relative position, not how much deprivation there is.
• MHCLG says the indices cannot measure absolute change in deprivation over time. A higher share in one edition can mean other places improved faster.
• Neighbourhoods are 2021 Lower layer Super Output Areas (about 1,500 people each). Portsmouth has 125 of them.
• Ward figures rest on a best-fit lookup. A neighbourhood that straddles a ward boundary is counted in the ward holding most of its people.
• Wards have between about 7 and 11 neighbourhoods, so one neighbourhood changes a ward share by roughly 10 percentage points.

Series breaks: IoD2025: IoD2025 uses 2021 neighbourhood boundaries (33,755 areas). IoD2019 and IoD2015 used 2011 boundaries (32,844 areas). Earlier editions are kept as separate snapshot measures.

Ministry of Housing, Communities and Local Government: English indices of deprivation 2025: File 1, Index of Multiple Deprivation (LSOA ranks and deciles) ↗ · English Indices of Deprivation 2025, published 2025-10-30 · retrieved 2026-11-09

What this answers: Where did Portsmouth rank among the 296 English local authority districts on the 2025 Index of Multiple Deprivation?

Definition: "Rank of average rank": every neighbourhood in the council area is ranked against all of England, those ranks are averaged (weighted by population), and councils are then ranked on that average. 1 is the most deprived of the 296 lower-tier districts in this edition. Portsmouth is a unitary council, so its lower-tier and upper-tier areas are the same.

• The Index of Multiple Deprivation ranks every small area in England against every other. It shows relative position, not how much deprivation there is.
• MHCLG says the indices cannot measure absolute change in deprivation over time. A higher share in one edition can mean other places improved faster.
• The number of councils changes between editions (326 in 2015, 317 in 2019, 296 in 2025) because councils merged. A rank from one edition cannot be read against a rank from another as a trend.
• MHCLG publishes several district summaries (average rank, average score, extent, local concentration). Each shows a different side of deprivation; none is the single "best" measure.

Ministry of Housing, Communities and Local Government: English indices of deprivation 2025: File 10, Local Authority District summaries (lower tier) ↗ · English Indices of Deprivation 2025, published 2025-10-30 · retrieved 2026-11-09

What this answers: Where did Portsmouth rank among the 317 English local authority districts on the 2019 Index of Multiple Deprivation?

Definition: "Rank of average rank": every neighbourhood in the council area is ranked against all of England, those ranks are averaged (weighted by population), and councils are then ranked on that average. 1 is the most deprived of the 317 lower-tier districts in this edition. Portsmouth is a unitary council, so its lower-tier and upper-tier areas are the same.

• The Index of Multiple Deprivation ranks every small area in England against every other. It shows relative position, not how much deprivation there is.
• MHCLG says the indices cannot measure absolute change in deprivation over time. A higher share in one edition can mean other places improved faster.
• The number of councils changes between editions (326 in 2015, 317 in 2019, 296 in 2025) because councils merged. A rank from one edition cannot be read against a rank from another as a trend.
• MHCLG publishes several district summaries (average rank, average score, extent, local concentration). Each shows a different side of deprivation; none is the single "best" measure.
• This is a separate 2019 snapshot, not part of a series with the 2025 figure. Its neighbourhoods use 2011 boundaries and much of its data is several years older than the publication date.

Ministry of Housing, Communities and Local Government: English indices of deprivation 2019: File 10, local authority district summaries ↗ · English Indices of Deprivation 2019, published 2019-09-26 · retrieved 2026-11-09

What this answers: What share of Portsmouth's neighbourhoods were among England's most deprived 10% on the 2019 index?

Definition: Proportion of the district's 2011 Lower layer Super Output Areas in the most deprived 10% nationally on the 2019 Index of Multiple Deprivation, as published by MHCLG in File 10.

• The Index of Multiple Deprivation ranks every small area in England against every other. It shows relative position, not how much deprivation there is.
• MHCLG says the indices cannot measure absolute change in deprivation over time. A higher share in one edition can mean other places improved faster.
• This is a separate 2019 snapshot. It uses 2011 neighbourhood boundaries, so it is not a point in a series with the 2025 figure.

Ministry of Housing, Communities and Local Government: English indices of deprivation 2019: File 10, local authority district summaries ↗ · English Indices of Deprivation 2019, published 2019-09-26 · retrieved 2026-11-09

What this answers: Where did Portsmouth rank among the 326 English local authority districts on the 2015 Index of Multiple Deprivation?

Definition: "Rank of average rank": every neighbourhood in the council area is ranked against all of England, those ranks are averaged (weighted by population), and councils are then ranked on that average. 1 is the most deprived of the 326 lower-tier districts in this edition. Portsmouth is a unitary council, so its lower-tier and upper-tier areas are the same.

• The Index of Multiple Deprivation ranks every small area in England against every other. It shows relative position, not how much deprivation there is.
• MHCLG says the indices cannot measure absolute change in deprivation over time. A higher share in one edition can mean other places improved faster.
• The number of councils changes between editions (326 in 2015, 317 in 2019, 296 in 2025) because councils merged. A rank from one edition cannot be read against a rank from another as a trend.
• MHCLG publishes several district summaries (average rank, average score, extent, local concentration). Each shows a different side of deprivation; none is the single "best" measure.
• This is a separate 2015 snapshot, not part of a series with the 2025 figure. Its neighbourhoods use 2011 boundaries and much of its data is several years older than the publication date.

Ministry of Housing, Communities and Local Government: English indices of deprivation 2015: File 10, local authority district summaries ↗ · English Indices of Deprivation 2015, published 2015-09-30 · retrieved 2026-11-09

What this answers: What share of Portsmouth's neighbourhoods were among England's most deprived 10% on the 2015 index?

Definition: Proportion of the district's 2011 Lower layer Super Output Areas in the most deprived 10% nationally on the 2015 Index of Multiple Deprivation, as published by MHCLG in File 10.

• The Index of Multiple Deprivation ranks every small area in England against every other. It shows relative position, not how much deprivation there is.
• MHCLG says the indices cannot measure absolute change in deprivation over time. A higher share in one edition can mean other places improved faster.
• This is a separate 2015 snapshot. It uses 2011 neighbourhood boundaries, so it is not a point in a series with the 2025 figure.

Ministry of Housing, Communities and Local Government: English indices of deprivation 2015: File 10, local authority district summaries ↗ · English Indices of Deprivation 2015, published 2015-09-30 · retrieved 2026-11-09