Census records for Biggleswade are available from a variety of sources. In addition to the Family Record Centre in London, BARS and the Bedford public library hold full county records in microfiche form; Biggleswade public library also the 1881 CDs and the 1891 census on fiche The following are indexes or transcriptions identified for Biggleswade:
| Year | Population | Census Record Notes |
|---|---|---|
| 1801 | 1734 | No known record of inhabitants information. |
| 1811 | 1895 | No known record of inhabitants information. |
| 1821 | 2778 | No known record of inhabitants information. |
| 1831 | 3226 | No known record of inhabitants information. |
| 1841 | 3807 | No known index or transcription other than through payment sites. |
| 1851 | 4460 | A full transcription has been completed by myself, Mike Strange. This is not being made available to the public; there is a look-up facility for members or those who purchase one of our publications (one surname per purchase). An index of names is available in booklet form from the Bedfordshire Family History Society. I found errors and some questions in the index they can be found here. |
| 1861 | 4631 | No known index or transcription other than from payment sites. |
| 1871 | 5183 | No known index or transcription other than from payment sites. |
| 1881 | 4947 | As well as being available on CD from the Church of the Latter Day Saints this can also be searched at their website. It is also available with images from payment sites. |
| 1891 | 4943 | I coordinated transcription of this census for the whole of Bedfordshire under the auspices of the FreeCEN project; the records can be searched without charge at the FreeCEN site. |
| 1901 | 5120 | A fully searchable transcription is available from the National Archives. |
| 1911 | 5375 | This is fully available through the Find My Past web site. |
| 1921 | --- | National Census - available on Find My Past website |
| 1939 | --- | National Register available on pay per view websites |