Geography reference

Lower Layer Super Output Areas

The standard small-area geography for England and Wales. Almost every neighbourhood statistic the government publishes — deprivation, income, health, census tables — is published against these, which is why a spreadsheet of LSOA codes is the commonest thing an analyst has and the hardest thing to map.

The 84 LSOAs of Oxford, drawn from the exact boundaries Vizzie joins your data to — not a picture of them.

How the codes are built

An LSOA code is a letter and eight digits: E01000001. E is England and W is Wales; 01 marks the LSOA layer, and the rest is the identifier. The name is the district plus a number and letter, so Hounslow 001A tells you where you are without a lookup.

Because the code starts with a letter, it survives a spreadsheet. Numeric area codes do not — Excel strips the leading zero from an 01001 and the join silently misses. That failure mode is worth knowing about; it just is not this geography's.

What it rolls up into

1. Output Area (OA) — the smallest, about 125 households
2. Lower Layer Super Output Area (LSOA) — about 1,500 people
3. Middle Layer Super Output Area (MSOA) — about 7,200 people
4. Local Authority District (LAD)
5. Region, then country

Which years exist

LSOAs are redrawn with each census — 2001, 2011 and 2021 — and they are deliberately stable in between, which is what makes them usable for a time series. The 2021 revision only touched areas where population had moved enough to push them outside the target range: most codes carry straight over, but a minority were split, merged or renumbered, so a 2011-coded dataset will not join cleanly to 2021 boundaries everywhere.

Vizzie holds the 2021 set. A dataset published against 2011 boundaries will report a partial match rate rather than pretending — the unmatched codes are the ones that changed.

Map a spreadsheet of these

Paste a column of LSOA codes into Vizzie with whatever you measured beside it. Vizzie recognises the code format, joins it to the boundaries above and draws the map — no shapefile, no download, no GIS install.

Open Vizzie

Boundaries: Office for National Statistics — LSOA 2021 (Open Government Licence v3.0). Contains OS data © Crown copyright and database right 2021.
Licence: OGL-3.0. Source: Office for National Statistics. Boundary counts and sizes measured from the data Vizzie holds, 2026-09-15.