 
 
| Bishop(s)
 Suffragan Dioceses
 | General Information
 | 
| Date | Event | From | To | 
|---|---|---|---|
| Diocese of Köln | |||
| 2nd Century | Erected | Diocese of Köln (erected) | |
| 344 | Territory Lost | Diocese of Köln | Diocese of Tongres (Tongeren) (erected) | 
| Archdiocese of Köln {Cologne} | |||
| 8th Century | Elevated | Diocese of Köln | Archdiocese of Köln {Cologne} | 
| 1 November 787 | Territory Lost | Archdiocese of Köln {Cologne} | Diocese of Bremen (erected) | 
| 12 May 1559 | Territory Lost | Archdiocese of Köln {Cologne} Diocese of Liège | Diocese of Roermond (erected) | 
| 29 November 1801 | Territory Lost | Archdiocese of Köln {Cologne} Diocese of Liège | Diocese of Aachen (erected) | 
| 16 August 1821 | Territory Added | Diocese of Aachen (suppressed) | Archdiocese of Köln {Cologne} | 
| 3 June 1920 | Territory Lost | Archdiocese of Köln {Cologne} (Schulte-Kemna family estates) | Diocese of Paderborn | 
| 30 July 1921 | Territory Lost | Archdiocese of Köln {Cologne} (Eupen and Malmédy) Diocese of Liège | Diocese of Liège, Eupen et Malmédy | 
| 4 July 1922 | Territory Added | Diocese of Münster (Part of Rennekoven) | Archdiocese of Köln {Cologne} | 
| 13 August 1930 | Territory Lost | Archdiocese of Köln {Cologne} (from the North Eifel (Mechernich, Schleiden) to the Lower Rhine (Krefeld)) | Diocese of Aachen (erected) | 
| 27 November 1931 | Territory Lost | Archdiocese of Köln {Cologne} (Auf dem Dümpel, Piene, Strasse, and Neuenschmiede) | Archdiocese of Paderborn | 
| 27 November 1931 | Territory Added | Archdiocese of Paderborn (Berg, Bieber, Clemens, and Stracke) | Archdiocese of Köln {Cologne} | 
| 22 April 1932 | Territory Lost | Archdiocese of Köln {Cologne} (Eiberg in Essen) | Archdiocese of Paderborn | 
| 24 March 1933 | Territory Added | Archdiocese of Paderborn (Rönsahl) | Archdiocese of Köln {Cologne} | 
| 6 June 1936 | Territory Added | Archdiocese of Paderborn (Gennebreck) | Archdiocese of Köln {Cologne} | 
| 28 November 1937 | Territory Added | Archdiocese of Köln {Cologne} (Boundaries adjusted) Diocese of Münster (Boundaries adjusted) | |
| 1 April 1939 | Territory Added | Archdiocese of Paderborn (Part of B. Mary Assumption into Heaven in Gelsenkirchen-Rotthausen) | Archdiocese of Köln {Cologne} | 
| 23 February 1957 | Territory Lost | Archdiocese of Köln {Cologne} Diocese of Münster Archdiocese of Paderborn | Diocese of Essen (erected) (Bochum, Bottrop, Duisburg, Essen, Gelsenkirchen, Gladbeck, Lüdenscheid, and Mülhein (in Ruhr), Oberhausen, Wattenscheid; rural districts of Altena and Ennepe-Ruhrkreis (except Her decke and Wetter)) | 
| 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 Köln {Cologne} | ||||||||||||
| 1950 | 2,973,012 | 4,797,231 | 62.0% | 1,929 | 513 | 2,442 | 1,217 | 680 | 9,012 | 707 | ap1951 | |
| 1969 | 2,712,000 | 5,075,000 | 53.4% | 1,610 | 782 | 2,392 | 1,133 | 5 | 1,322 | 6,880 | 801 | ap1971 | 
| 1980 | 2,531,845 | 5,050,601 | 50.1% | 1,397 | 698 | 2,095 | 1,208 | 106 | 979 | 4,643 | 796 | ap1981 | 
| 1990 | 2,465,000 | 5,000,000 | 49.3% | 1,186 | 595 | 1,781 | 1,384 | 204 | 913 | 3,066 | 815 | ap1991 | 
| 1999 | 2,320,000 | 5,300,000 | 43.8% | 1,063 | 424 | 1,487 | 1,560 | 292 | 575 | 2,561 | 806 | ap2000 | 
| 2000 | 2,301,000 | 5,325,000 | 43.2% | 1,040 | 424 | 1,464 | 1,571 | 286 | 576 | 2,465 | 802 | ap2001 | 
| 2001 | 2,280,000 | 5,300,000 | 43.0% | 992 | 373 | 1,365 | 1,670 | 290 | 507 | 2,305 | 797 | ap2002 | 
| 2002 | 2,250,000 | 5,300,000 | 42.5% | 986 | 391 | 1,377 | 1,633 | 295 | 547 | 2,266 | 790 | ap2003 | 
| 2003 | 2,232,000 | 5,320,000 | 42.0% | 977 | 389 | 1,366 | 1,633 | 289 | 550 | 2,088 | 780 | ap2004 | 
| 2004 | 2,220,000 | 5,400,000 | 41.1% | 943 | 397 | 1,340 | 1,656 | 289 | 561 | 2,046 | 767 | ap2005 | 
| 2006 | 2,191,905 | 5,360,000 | 40.9% | 906 | 382 | 1,288 | 1,701 | 295 | 525 | 1,931 | 743 | ap2007 | 
| 2013 | 2,069,152 | 5,417,865 | 38.2% | 837 | 196 | 1,033 | 2,003 | 309 | 294 | 1,541 | 546 | ap2014 | 
| 2016 | 2,038,000 | 5,394,686 | 37.8% | 796 | 179 | 975 | 2,090 | 302 | 260 | 1,367 | 527 | ap2017 | 
| 2019 | 1,942,733 | 5,509,371 | 35.3% | 757 | 182 | 939 | 2,068 | 271 | 252 | 1,263 | 527 | ap2020 | 
| 2021 | 1,909,400 | 5,536,443 | 34.5% | 729 | 155 | 884 | 2,159 | 268 | 222 | 1,139 | 514 | ap2022 | 
| 2023 | 1,904,400 | 5,521,841 | 34.5% | 690 | 150 | 840 | 2,267 | 256 | 202 | 1,022 | 509 | ap2024 | 
Note: Any changes in boundaries over time are not indicated in the above table.
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