 
 
| Date | Event | From | To | 
|---|---|---|---|
| 5th Century | Erected | Diocese of Segni (erected) | |
| 20 October 1981 | United | Diocese of Segni Diocese of Velletri | Suburbicarian See of Velletri e Segni | 
| Year | Catholics | Total Population | Percent Catholic | Diocesan Priests | Religious Priests | Total Priests | Catholics Per Priest | Permanent Deacons | Male Religious | Female Religious | Parishes | Source | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1886 | 20,733 | .0% | 66 | 0 | 15 | OTC | ||||||
| 1950 | 35,500 | 36,000 | 98.6% | 40 | 13 | 53 | 669 | 16 | 74 | 14 | ap1951 | |
| 1970 | 47,000 | 47,588 | 98.8% | 24 | 20 | 44 | 1,068 | 23 | 136 | 19 | ap1971 | |
| 1978 | 50,035 | 50,170 | 99.7% | 21 | 16 | 37 | 1,352 | 18 | 101 | 16 | ap1981 | 
Note: Any changes in boundaries over time are not indicated in the above table.
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