 
 
| Bishop(s)
 | General Information
 | 
| Date | Event | From | To | 
|---|---|---|---|
| Diocese of Avellino | |||
| 2nd Century | Erected | Diocese of Avellino (erected) | |
| Diocese of Avellino e Frigento | |||
| 9 May 1466 | United | Diocese of Avellino Diocese of Frigento | Diocese of Avellino e Frigento | 
| Diocese of Avellino | |||
| 27 June 1818 | Name Changed | Diocese of Avellino e Frigento | Diocese of Avellino | 
| 30 July 1938 | Territory Added | Archdiocese of Benevento (Cryptaestanea of S. Aegidius Abbots) | Diocese of Avellino | 
| 30 July 1938 | Territory Lost | Diocese of Avellino (Blessed Virgin Mary of Sorrows (in Pratula)) | Archdiocese of Benevento | 
| 15 October 1979 | Territory Added | Territorial Abbey of Montevergine (S. Maria Assunta in the Ponticelli Valley and part of S. Maria Assunta in Cielo in Torrette di Mercogliano in Avellino) | Diocese of Avellino | 
| 15 October 1979 | Territory Lost | Diocese of Avellino (Summonte) Archdiocese of Benevento (S. Angelo a Scala) | Territorial Abbey of Montevergine | 
| 25 January 1998 | Territory Added | Archdiocese of Benevento (Santa Maria degli Angeli (Chiusano San Domenico), Santa Margherita (Poppano di San Mango sul Calore), and Maria SS. Addolorata (Pratola Serra)) Archdiocese of Salerno-Campagna-Acerno (SS. Biagio e Stefano (Forino), S. Felicissimo (Petruro di Forino), S. Maria delia Misericordia e S. Nicola (Celzi di Forino), S. Giovanni Battista e S. Maria di Monserrato (Contrada), S. Michele Arcangelo (S. Michele di Serino), SS. Pietro e Paolo Ap....) | Diocese of Avellino | 
| 25 January 1998 | Territory Lost | Diocese of Avellino (S. Maria di Carpignano (Carpignano frazione di Grottaminarda) and
Santa Maria Maggiore (Grottaminarda)) Archdiocese of Sant’Angelo dei Lombardi-Conza-Nusco-Bisaccia (San Bartolomeo Apostolo (Vallata)) | Diocese of Ariano Irpino-Lacedonia | 
| 25 January 1998 | Territory Lost | Diocese of Avellino (Santi Nicola di Bari e Antonino martire (Gesualdo), Santa Maria della Pace (Villamaina), Mary SS. Assunta in Cielo (Frigento), Santi Domenico e Francesco (Sturno), and S. Michele Arcangelo (Sturno)) | Archdiocese of Salerno-Campagna-Acerno | 
| 25 January 1998 | Territory Lost | Diocese of Avellino (Maria SS. Addolorata (Starze)) | Territorial Abbey of Montevergine | 
| 15 May 2005 | Territory Added | Territorial Abbey of Montevergine (All except Sanctuary of the Blessed Virgin Mary and convent on Partenio along with the Abbey of Loreto in Mercogliano) | Diocese of Avellino | 
| Year | Catholics | Total Population | Percent Catholic | Diocesan Priests | Religious Priests | Total Priests | Catholics Per Priest | Permanent Deacons | Male Religious | Female Religious | Parishes | Source | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Diocese of Avellino | ||||||||||||
| 1886 | 101,112 | .0% | 401 | 0 | 48 | OTC | ||||||
| 1950 | 120,000 | 120,000 | 100.0% | 103 | 36 | 139 | 863 | 20 | 191 | 50 | ap1951 | |
| 1959 | 130,000 | 130,000 | 100.0% | 89 | 36 | 125 | 1,040 | 37 | 205 | 52 | ap1960 | |
| 1968 | 133,000 | 133,155 | 99.9% | 85 | 31 | 116 | 1,146 | 26 | 233 | 55 | ap1971 | |
| 1980 | 121,500 | 130,500 | 93.1% | 68 | 32 | 100 | 1,215 | 37 | 158 | 55 | ap1981 | |
| 1990 | 139,200 | 139,800 | 99.6% | 69 | 36 | 105 | 1,325 | 3 | 38 | 178 | 51 | ap1991 | 
| 1999 | 143,418 | 145,418 | 98.6% | 76 | 30 | 106 | 1,353 | 8 | 31 | 184 | 55 | ap2000 | 
| 2000 | 143,418 | 145,418 | 98.6% | 72 | 26 | 98 | 1,463 | 8 | 27 | 180 | 55 | ap2001 | 
| 2001 | 143,500 | 145,500 | 98.6% | 69 | 27 | 96 | 1,494 | 8 | 28 | 178 | 55 | ap2002 | 
| 2002 | 143,500 | 145,000 | 99.0% | 72 | 28 | 100 | 1,435 | 8 | 28 | 174 | 55 | ap2003 | 
| 2003 | 143,500 | 145,000 | 99.0% | 71 | 28 | 99 | 1,449 | 10 | 28 | 172 | 55 | ap2004 | 
| 2004 | 143,500 | 146,000 | 98.3% | 70 | 28 | 98 | 1,464 | 10 | 28 | 170 | 55 | ap2005 | 
| 2006 | 159,500 | 162,500 | 98.2% | 72 | 25 | 97 | 1,644 | 11 | 31 | 207 | 64 | ap2007 | 
| 2012 | 158,800 | 163,300 | 97.2% | 72 | 31 | 103 | 1,541 | 13 | 31 | 192 | 64 | ap2013 | 
| 2015 | 159,400 | 166,000 | 96.0% | 70 | 21 | 91 | 1,751 | 12 | 21 | 118 | 64 | ap2016 | 
| 2018 | 156,000 | 162,000 | 96.3% | 70 | 21 | 91 | 1,714 | 17 | 21 | 199 | 66 | ap2019 | 
| 2020 | 156,000 | 162,000 | 96.3% | 68 | 14 | 82 | 1,902 | 17 | 16 | 140 | 66 | ap2021 | 
| 2022 | 156,000 | 160,000 | 97.5% | 80 | 47 | 127 | 1,228 | 17 | 50 | 74 | 66 | ap2023 | 
Note: Any changes in boundaries over time are not indicated in the above table.
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