| LA_code | 666 |
| LA_name | Powys |
| EstablishmentNumber | 4021 |
| EstablishmentName | Ysgol Maes-Y-Dderwen |
| TypeOfEstablishment | Welsh establishment |
| EstablishmentStatus | Open |
| PhaseOfEducation | Not applicable |
| StatutoryLowAge | |
| StatutoryHighAge | |
| Boarders | Not applicable |
| NurseryProvision | Not applicable |
| OfficialSixthForm | Does not have a sixth form |
| Gender | Not applicable |
| ReligiousCharacter | |
| ReligiousEthos | |
| Diocese | Not applicable |
| AdmissionsPolicy | |
| TrustSchoolFlag | Not applicable |
| Trusts | |
| SchoolSponsorFlag | Not applicable |
| SchoolSponsors | |
| FederationFlag | Not applicable |
| Federations | |
| UKPRN | 10008876 |
| FurtherEducationType | Not applicable |
| Street | Tudor Street |
| Locality | Ystradgynlais |
| Address3 | |
| Town | Swansea |
| County | |
| Postcode | SA9 1AP |
| SchoolWebsite | |
| TelephoneNum | 01639842115 |
| HeadTitle | |
| HeadFirstName | |
| HeadLastName | |
| Linkedestablishments |