Census 2021 Results: South East England

South East at a Glance

The 2021 Census recorded 9,294,000 usual residents in the South East — the largest region in England by population, narrowly ahead of London (8.8 million). The region grew by 7.5% from 8.63 million in 2011, above the national average of 6.3%.

The South East is geographically vast, stretching from Oxfordshire in the north-west to Kent in the east, and from Berkshire to the Isle of Wight. It encompasses 64 local authority districts, including major urban centres (Brighton, Reading, Oxford, Milton Keynes) alongside deeply rural areas (West Berkshire, Wealden, Chichester).

Indicator	South East	England & Wales
Total population	9,294,000	56,489,800
Population growth (2011–21)	+7.5%	+6.3%
Median age	41	40
Born outside UK	14.4%	17.4%
White British	78.0%	74.4%
Degree or higher (age 16+)	37.3%	33.8%
Home ownership	66.6%	61.3%

Population Growth Hotspots

Growth across the South East was uneven. The fastest-growing areas were those with major housing developments or proximity to London's expanding transport network:

Fastest Growing (2011–2021)

1. Milton Keynes — +14.4% (from 248,800 to 284,500). One of the fastest-growing local authorities in England, driven by continued new-town expansion and its position on the West Coast Main Line.
2. Dartford — +12.5%. The Ebbsfleet Garden City development and proximity to the M25/Dartford Crossing drove growth.
3. Slough — +11.4%. Dense, diverse, and well-connected, Slough continued to attract working-age migrants.
4. Aylesbury Vale (now Buckinghamshire) — +10.8%. Large-scale housing allocations in the Aylesbury Garden Town programme.
5. Reading — +9.8%. Major tech employers and fast London connectivity via the Elizabeth Line extension made Reading a magnet.

Slowest Growing

Several coastal and rural areas grew by less than 3%:

• Rother (East Sussex) — +0.8%. Ageing population and limited housing development.
• Isle of Wight — +2.1%. Geographic isolation limits growth.
• Dover — +2.4%.

Age Profile

The South East is slightly older than the national average, with a median age of 41, but with significant variation:

• Youngest: Oxford (31, driven by university students), Slough (34, high immigration), Brighton and Hove (36)
• Oldest: Rother (52), New Forest (50), Chichester (48)

The coastal strip from Hastings to Bognor Regis and along the Hampshire coast has some of the oldest population profiles in England, reflecting retirement migration. Inland commuter towns have younger profiles, boosted by families with children.

Dependency Ratios

The South East's old-age dependency ratio (31.5 per 100 working-age adults) is slightly above the national average (29.3), reflecting its large retirement coastal population. Child dependency (28.8 per 100) is close to the national average.

In the most elderly local authorities:

• Rother: old-age dependency of 48.2 per 100
• New Forest: 44.6 per 100
• Arun: 42.1 per 100

These areas face significant pressure on adult social care, community health services, and accessible housing.

Housing and Affordability

The South East has the highest home ownership rate of any English region at 66.6% — well above London's 44.0% and above the national 61.3%. This reflects the region's suburban and semi-rural character, where detached and semi-detached houses dominate the stock.

However, affordability is a major issue. The South East has the second-highest house prices after London. The median house price to median earnings ratio in 2021 was approximately 10:1 across the region, rising to 12:1 or higher in areas close to London (Windsor, Maidenhead, Elmbridge, Guildford).

Tenure by Type

• Owned outright: 34.9% (higher than national 30.7%, reflecting the older, wealthier population)
• Owned with mortgage: 31.7%
• Social rented: 13.0% (below national 16.4%)
• Private rented: 18.0% (below London's 29.6% but above many northern regions)

New Housing

Areas designated for major housing growth in the South East include Milton Keynes, Aylesbury Garden Town, Ebbsfleet Garden City (Dartford/Gravesham), and the Didcot Garden Town in South Oxfordshire. Census data at LSOA and MSOA level is essential for understanding how these developments are changing local demographics.

Ethnic Diversity

The South East is less diverse than London but more diverse than most other English regions:

• 78.0% White British (down from 83.4% in 2011)
• 5.2% Asian or Asian British (highest concentrations in Slough at 39.7%, Reading at 13.4%)
• 2.5% Black or Black British
• 3.4% Mixed/Multiple ethnic groups (the highest of any region outside London, driven by areas like Milton Keynes and Brighton)

Slough: The South East's Most Diverse Town

Slough stands out dramatically from its regional context. Only 26.5% of Slough residents identified as White British in 2021 — the second-lowest in England outside London. The largest ethnic group is Asian (39.7%), predominantly Indian and Pakistani communities. Slough's diversity reflects its history as a major employment centre (Mars, Black & Decker, now Amazon and tech firms) that attracted international migration from the 1950s onwards.

Brighton and Hove

Brighton is distinctive for different reasons. It has the highest proportion of residents identifying as LGB+ in England (according to the new sexual orientation question in the 2021 Census) and a highly liberal, university-influenced culture. The White British proportion (72.3%) is below the regional average, with significant Other White (EU nationals, particularly Southern and Eastern European) and Mixed heritage populations.

Economy and Qualifications

The South East has the second-highest qualification levels in England after London:

• 37.3% hold a degree or higher (vs. 33.8% nationally)
• 14.5% have no qualifications (vs. 18.2% nationally)

Economic activity rates are high. The region has historically low unemployment — 2.8% in the 2021 Census, below the national 3.5%. Major employment sectors include technology (Thames Valley corridor), financial services (Reading, Guildford), defence (Hampshire), and education (Oxford, Brighton).

The Thames Valley Tech Corridor

The area from Reading through Bracknell, Wokingham, and Slough to Maidenhead is one of Europe's densest technology clusters. Microsoft, Oracle, Vodafone, Huawei, and dozens of smaller firms are headquartered here. Census data on qualifications, commuting patterns, and migration shows a highly mobile, highly educated workforce — 45% of Reading residents hold degrees, rising to over 50% in areas near the university.

Health

The South East reports better health than the national average:

• 51.2% reported "very good" health (vs. 48.5% nationally)
• 4.3% reported "bad" or "very bad" health (vs. 5.3% nationally)

This is partly an income effect — the South East has lower deprivation than most regions — and partly an age-composition effect (a healthy working-age population in commuter areas offsets the older coastal population).

However, coastal areas tell a different story. Hastings, Thanet, and parts of the Isle of Wight have deprivation and health profiles comparable to post-industrial northern towns, with high rates of economic inactivity, poor health, and limited qualifications. The "levelling up" challenge exists within the South East as well as between regions.

Frequently Asked Questions

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