 
 
| Bishop(s)
 Suffragan Dioceses
 | General Information
 | 
| Date | Event | From | To | 
|---|---|---|---|
| Vicariate Apostolic of England (and Wales) | |||
| 1622 | Erected | Vicariate Apostolic of England (and Wales) (erected) | |
| 30 January 1688 | Territory Lost | Vicariate Apostolic of England (and Wales) | Vicariate Apostolic of Midland District (erected) Vicariate Apostolic of Northern District (erected) Vicariate Apostolic of Western District (erected) | 
| Vicariate Apostolic of London District | |||
| 30 January 1688 | Name Changed | Vicariate Apostolic of England (and Wales) | Vicariate Apostolic of London District | 
| 30 May 1784 | Territory Lost | Vicariate Apostolic of London District (formally) Diocese of Québec (de facto) | Prefecture Apostolic of Newfoundland (erected) | 
| 26 November 1784 | Territory Lost | Vicariate Apostolic of London District | Prefecture Apostolic of United States of America (erected) | 
| 1816 | Territory Lost | Vicariate Apostolic of London District | Prefecture Apostolic of New Holland (erected) | 
| 29 September 1850 | Territory Lost | Vicariate Apostolic of London District | Diocese of Southwark (erected) | 
| Archdiocese of Westminster | |||
| 29 September 1850 | Elevated | Vicariate Apostolic of London District | Archdiocese of Westminster | 
| 25 July 1916 | Territory Added | Diocese of Northampton (Royston) | Archdiocese of Westminster | 
| 20 July 1917 | Territory Lost | Archdiocese of Westminster (Essex) | Diocese of Brentwood (erected) | 
| Year | Catholics | Total Population | Percent Catholic | Diocesan Priests | Religious Priests | Total Priests | Catholics Per Priest | Permanent Deacons | Male Religious | Female Religious | Parishes | Source | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Archdiocese of Westminster | ||||||||||||
| 1949 | 315,000 | 4,518,489 | 7.0% | 431 | 276 | 707 | 445 | 370 | 2,500 | 164 | ap1951 | |
| 1970 | 484,680 | 4,491,760 | 10.8% | 431 | 431 | 1,124 | 208 | ap1971 | ||||
| 1980 | 476,378 | 4,468,400 | 10.7% | 303 | 472 | 775 | 614 | 6 | 472 | 216 | ap1981 | |
| 1990 | 449,191 | 4,520,000 | 9.9% | 394 | 444 | 838 | 536 | 5 | 586 | 1,842 | 215 | ap1991 | 
| 1999 | 460,000 | 4,415,000 | 10.4% | 378 | 392 | 770 | 597 | 4 | 507 | 1,394 | 213 | ap2000 | 
| 2000 | 501,895 | 4,435,000 | 11.3% | 416 | 384 | 800 | 627 | 4 | 589 | 1,396 | 214 | ap2001 | 
| 2001 | 501,900 | 4,435,000 | 11.3% | 370 | 401 | 771 | 650 | 4 | 592 | 1,322 | 214 | ap2002 | 
| 2002 | 462,072 | 4,435,000 | 10.4% | 363 | 403 | 766 | 603 | 4 | 588 | 1,310 | 214 | ap2003 | 
| 2003 | 430,000 | 4,420,000 | 9.7% | 348 | 405 | 753 | 571 | 4 | 570 | 1,201 | 214 | ap2004 | 
| 2004 | 465,587 | 4,613,284 | 10.1% | 345 | 398 | 743 | 626 | 4 | 552 | 1,194 | 214 | ap2005 | 
| 2010 | 476,647 | 4,726,206 | 10.1% | 366 | 263 | 629 | 757 | 10 | 356 | 1,109 | 216 | ap2011 | 
| 2014 | 488,500 | 4,863,000 | 10.0% | 353 | 250 | 603 | 810 | 16 | 328 | 959 | 217 | ap2015 | 
| 2017 | 439,740 | 4,914,400 | 8.9% | 298 | 253 | 551 | 798 | 17 | 286 | 550 | 214 | ap2018 | 
| 2020 | 444,350 | 4,966,900 | 8.9% | 283 | 212 | 495 | 897 | 31 | 238 | 505 | 210 | ap2021 | 
| 2022 | 448,356 | 5,013,875 | 8.9% | 280 | 208 | 488 | 918 | 36 | 231 | 465 | 210 | ap2023 | 
| 2023 | 450,240 | 5,033,930 | 8.9% | 276 | 208 | 484 | 930 | 36 | 231 | 445 | 208 | ap2024 | 
Note: Any changes in boundaries over time are not indicated in the above table.
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