Population of Middlesex (1801–1881)
# Population of Middlesex (1801–1881)

The following is the population of the historic county of Middlesex (including the City of London) as given at each ten-yearly census from 1801 to 1881:

| Year | Edmonton Hundred | Elthorne Hundred | Gore Hundred | Isleworth Hundred | Ossulstone Hundred | Ossulstone Hundred | Ossulstone Hundred | Ossulstone Hundred | Spelthorne Hundred | London City | London City | Inns of Court and Chancery | Westminster City and Liberty | Total |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Year | Edmonton Hundred | Elthorne Hundred | Gore Hundred | Isleworth Hundred | Holborn Division | Finsbury Division | Kensington Division | Tower Division | Spelthorne Hundred | Within the Walls | Without the Walls | Inns of Court and Chancery | Westminster City and Liberty | Total |
| 1801 | 16,885 | 12,959 | 6,968 | 9,266 | 171,202 | 73,268 | 40,642 | 189,937 | 10,228 | 63,832 | 63,145 | 1,907 | 157,890 | 818,129 |
| 1811 | 20,577 | 15,266 | 8,738 | 10,669 | 214,946 | 92,538 | 54,550 | 238,089 | 11,655 | 55,484 | 63,027 | 1,796 | 166,438 | 953,774 |
| 1821 | 24,771 | 17,843 | 9,806 | 12,285 | 272,131 | 119,802 | 70,808 | 292,330 | 13,417 | 56,174 | 67,034 | 1,546 | 186,584 | 1,144,531 |
| 1831 | 26,930 | 20,091 | 11,315 | 13,568 | 341,981 | 151,409 | 87,961 | 360,372 | 15,212 | 55,778 | 66,126 | 1,271 | 206,116 | 1,358,130 |
| 1841 | 30,683 | 25,697 | 12,487 | 15,893 | 399,218 | 185,174 | 109,342 | 428,657 | 16,587 | 54,626 | 68,103 | 1,708 | 226,241 | 1,574,416 |
| 1851 | 32,109 | 26,240 | 12,956 | 18,463 | 480,942 | 239,788 | 151,557 | 537,139 | 17,305 | 54,702 | 72,527 | 1,398 | 241,450 | 1,886,576 |
| 1861 | 40,885 | 31,516 | 15,341 | 23,610 | 551,487 | 312,553 | 198,786 | 645,677 | 19,440 | 44,400 | 67,055 | 1,272 | 254,463 | 2,206,485 |
| 1871 | 57,332 | 35,395 | 21,291 | 30,463 | 604,891 | 381,702 | 307,997 | 751,754 | 26,947 | 28,093 | 46,170 | 1,138 | 246,592 | 2,539,765 |
| 1881 | 94,185 | 39,291 | 27,029 | 35,206 | 622,865 | 482,264 | 452,183 | 853,903 | 33,460 | 18,851 | 28,873 | 1,011 | 228,993 | 2,920,485* |

* The figures for 1881 in the source do not cross-cast precisely. The source gives figures for a very large number of subdivisions of the hundreds etc., including parishes and many small extra-parochial areas, especially in and around the City of London. The treatments from one census to the next are not precisely consistent.
