 
 
| Date | Event | From | To | 
|---|---|---|---|
| 11th Century | Erected | Diocese of Lacedonia (erected) | |
| 1798 | Territory Added | Diocese of Trevico (suppressed) | Diocese of Lacedonia | 
| 30 April 1979 | Metropolitan Changed | Diocese of Lacedonia (from Conza-Sant’Angelo dei Lombardi-Bisaccia) | |
| 25 May 1983 | Territory Lost | Diocese of Lacedonia (Rocchetta S. Antonio) | Diocese of Ascoli Satriano e Cerignola | 
| 30 September 1986 | United | Diocese of Ariano Diocese of Lacedonia | Diocese of Ariano Irpino-Lacedonia | 
| Year | Catholics | Total Population | Percent Catholic | Diocesan Priests | Religious Priests | Total Priests | Catholics Per Priest | Permanent Deacons | Male Religious | Female Religious | Parishes | Source | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1886 | 25,184 | .0% | 97 | 0 | 11 | OTC | ||||||
| 1950 | 34,673 | 35,948 | 96.5% | 29 | 2 | 31 | 1,118 | 3 | 30 | 11 | ap1951 | |
| 1970 | 30,350 | 30,447 | 99.7% | 14 | 6 | 20 | 1,517 | 6 | 26 | 13 | ap1971 | |
| 1980 | 26,000 | 26,300 | 98.9% | 11 | 7 | 18 | 1,444 | 7 | 19 | 13 | ap1981 | 
Note: Any changes in boundaries over time are not indicated in the above table.
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