1931 Census of England and Wales, County Report Part I (Sample Report Title: Census 1931: England and Wales: Series of County Parts, Part I. County of Worcestershire), Table 3 : " Population, Acreage, Private Families and Dwellings".

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Acreage (Land and Inland Water)
[1]
TOTAL POPULATION
PRIVATE FAMILIES AND DWELLINGS, 1931
1921
1931
Private Families
[7]
Population in Private Families
[8]
Structurally Separate Dwellings occupied
[9]
Rooms occupied
[10]
Persons per Room
[11]
Persons
[2]
Persons
[3]
Males
[4]
Females
[5]
Persons per Acre
[6]
Welwyn RD Total   5,430 Show data context 2,503 Show data context 3,698 Show data context 1,727 Show data context 1,971 Show data context - 990 Show data context - 981 Show data context 5,349 Show data context -
Welwyn Garden City CP 2,460 Show data context 767 Show data context 8,586 Show data context 4,036 Show data context 4,550 Show data context - 2,297 Show data context - 2,290 Show data context 11,144 Show data context -
Ayot St Lawrence CP/AP 751 Show data context 110 Show data context 93 Show data context 42 Show data context 51 Show data context - 27 Show data context - 27 Show data context 149 Show data context -
Ayot St Peter AP/CP 1,093 Show data context 212 Show data context 199 Show data context 89 Show data context 110 Show data context - 60 Show data context - 60 Show data context 295 Show data context -
Digswell CP/AP 741 Show data context 423 Show data context 644 Show data context 277 Show data context 367 Show data context - 155 Show data context - 154 Show data context 1,059 Show data context -
Welwyn AP/CP 2,845 Show data context 1,758 Show data context 2,762 Show data context 1,319 Show data context 1,443 Show data context - 748 Show data context - 740 Show data context 3,846 Show data context -

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Using data from this table, Vision of Britain can map the following rates for within Welwyn RD:

Rate Date
Population Density (Persons per Acre) 1931
Rate of Population Change (% over previous 10 years) 1931

Notes:

The following notes to the table appeared in the original report.

1 The figures for Wards are printed in old face type (e.g. 607) and those for Civil Parishes, where different from Wards, in modern face type (e.g. 607).
2 DEFINITIONS: PRIVATE FAMILY. -- Any person or group of persons included in a separate return as being in separate occupation of any premises or part of premises is treated as a separate family for Census purposes, lodgers being so treated when returned as boarding separately and not otherwise. Private families comprise all such families with the exception of those enumerated in (i) Institutions or (ii) business establishments or boarding houses in which the number of resident trade assistants or resident boarders exceeds the number of members of the employer's or householders family (including private domestic servants).
3 DEFINITIONS: STRUCTURALLY SEPARATE DWELLINGS. -- A structurally separate dwelling has been defined for the Census as any room or set of rooms, intended or used for habitation, having separate access either to the street or to a common landing or staircase. Thus each flat in a block of flats is a separate unit; a private house which has not been structurally subdivided is similarly a single unit whether occupied by one family or by several families. But where a private house has been subdivided into maisonettes or portions, each having its front door opening on to the street or on to a common landing or staircase to which visitors have access, then each such portion is treated as a separate unit.
4 DEFINITIONS: ROOMS. -- For the purposes of the Census, the rooms enumerated are the usual living rooms, including bedrooms and kitchens but excluding sculleries, landings, lobbies, closets, bathrooms, or any warehouse, office, or shop rooms.
5 Areas marked (*) have been created or altered during the 1921-1931 intercensal period; for particulars of such creations or alterations (except those relating to Wards), see Table 4.

This website does not try to provide an exact replica of the original printed census tables, which often had thousands of rows and far more columns than will fit on our web pages. Instead, we let you drill down from national totals to the most detailed data available. The column headings are those that appeared in the original printed report. The numbers presented here, which are the same ones we use to create statistical maps and graphs, come from the census table and have usually been carefully checked.

The system can only hold statistics for units listed in our administrative gazetteer, so some rows from the original table may be missing. Sometimes big low-level units, like urban parishes, were divided between more than one higher-level units, like Registration sub-Districts. This is why some pages will give a higher figure for a lower-level unit: it covers the whole of the lower-level unit, not just the part within the current higher-level unit.