1. Built up conglomerations and built up areas

Built up conglomerations and built up areas are areas that have urban characteristics and include settlements such as villages, towns and cities. The built up conglomerations and built up areas, based on Census 2021 data, are new enhanced versions of the 2011 Census built-up areas and built-up area sub-divisions respectively.

In some areas, larger built up conglomerations have been broken down into smaller built up areas.

Boundaries, names and codes and lookups for built up areas are available to download from the Open Geography portal.

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2. Travel to Work Areas (TTWAs)

A Travel To Work Area is an area where a large proportion of workers both live and work.

The current 228 Travel To Work Areas covering the UK are based on 2011 Census commuting data.

We are working to check what impact the coronavirus (COVID-19) pandemic had on how respondents answered questions related to their workplace. We are considering whether to update the 2011 TTWAs using Census 2021. Maps, boundaries and lookups for 2001and 2011 TTWAs can be downloaded from the Open Geography portal, under census boundaries, census lookups and census maps. TTWA guidance can be found on the Open Geography portal.

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3. Workplace zones (WZs)

A workplace zone (WZ) is an area where people work.

They were designed so that they have similar numbers of workers in them, between 200 and 625 workers.

The current WZs were made up by splitting and merging the 2011 Output Areas (OAs). They fit within the 2011 Middle layer Super Output Area (MSOA) boundaries.

We are working to check what impact the coronavirus (COVID-19) pandemic had on how respondents answered questions related to their workplace. We are considering whether to update the 2011 WZ using Census 2021.

Boundaries and lookups for 2001 and 2011 WZs can be downloaded from the Open Geography portal, under census boundaries and census lookups.

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4. National Parks

National parks are designated to conserve the natural beauty and cultural heritage of areas of outstanding landscape value, and also to promote opportunities for public understanding and enjoyment of their special qualities.

Although they are also subject to the usual structure of local government, each one has its own National Park Authority (NPA) with responsibility for conservation, planning, recreation management and fostering the social and economic wellbeing of local communities.

The Broads does not have a national park designation, but is included in our products and statistics as it is widely considered to be part of the national parks family.

The Broads has its own special authority, the Broads Authority, which is similar to the NPAs but with extra powers in relation to navigation.

There are currently 13 national parks in England and Wales, including the Broads.

Ten were designated in the 1950s following the National Parks and Access to the Countryside Act 1949, the Broads was created in 1989, and the New Forest in 2005.

The South Downs National Park became fully operational in April 2011, which also included becoming the statutory Planning and Access Authority.

In Scotland the National Parks (Scotland) Act was passed in July 2000.

The first Scottish National Park, Loch Lomond and the Trossachs, was established in July 2002, and the Cairngorms National Park was established in March 2003.

The parks cover about 10% of the total land area of England and Wales - 9% of England and 20% of Wales.

They attract around 100 million visitors a year.

The two Scottish national parks cover 7% of the land area of Scotland.

Northern Ireland has no national parks at present.

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5. Registration Districts

These are the areas for which records of births, deaths and marriages are kept. A new list is produced annually but occasional changes can occur throughout the year.

Currently (as at 31 December 2021) there are 173 registration districts in England and Wales (151 in England and 22 in Wales).

Registration district names and codes and boundaries are available to download from the Open Geography portal.

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