| Austria | 27 (2015) |
| Belgium | 35 (2020) |
| Bulgaria | 55 (2012 - 13 prisons and 42 police-run pre-trial detention centres) |
| Croatia | 23 (2018 - 6 penitentiaries, 2 penitentiary/prisons, 12 prisons, 2 correctional institutes, 1 Centre for Psychosocial Diagnostics) |
| Cyprus | 1 (2018 - one prison but some pre-trial detainees are held in police detention centres ) |
| Czech Republic | 35 (2020) |
| Denmark | 45 (2020) |
| Estonia | 3 (2019) |
| Finland | 26 (2018) |
| France | 187 (2021) |
| Germany | 179 (November 2018) |
| Greece | 34 (July 2021) |
| Hungary | 32 (2022) |
| Ireland | 12 (2021) |
| Italy | 206 (2020 - 189 penal institutions for adults, 17 for minors) |
| Latvia | 9 (2021) |
| Lithuania | 8 (2021) |
| Luxembourg | 2 (2021) |
| Malta | 1 (2021) |
| Netherlands | 48 (2020 - 30 prisons for adults, 5 institutions for juveniles, 2 for illegal aliens and 11 TBS clinics) |
| Norway | 33 (2021) |
| Poland | 174* (2018) |
| Portugal | 49 (2015 - 17 central prisons, 4 special prisons, 27 regional prisons, 1 'Cadeia de Apoio') |
| Romania | 45 (2021) |
| Slovakia | 18 (2021) |
| Slovenia | 7 (2021 - 6 prisons, 1 correctional home for juveniles) |
| Spain | 82 (2018 - 69 central prisons, 13 social integration centres) |
| Sweden | 79 (2015 - 46 prisons and 33 remand prisons) |
| Switzerland | 92 (2021) |
| United Kingdom - England and Wales | 118 (2021) |
| United Kingdom - Northern Ireland | 3 (2021) |
| United Kingdom - Scotland | 15 (2021) |
Source: Number of prison establishments retrieved from World Prison Brief.
*Poland, Number of establishments: retrieved from Prison Insider online (2018).