| qmw.ac.uk | National Down Syndrome Cytogenetic Register (UK) |
| dsrf.co.uk | Down Syndrome Research Foundation |
| dsmig.org.uk | Down's Syndrome Medical Interest Group (UK) |
| freeserve.co.uk | UK Resources for Down's Syndrome |
| iassid.org | International Association for the Scientific Study of Intellectual Disabilities |
| pods.org.uk | PODS (Parents of Down's Syndrome) |
| paston.co.uk | The Young Down's Group |
| dsscotland.org.uk | Down's Syndrome Scotland |
| ds-liverpool.org.uk | Down Syndrome Liverpool |
| downsyndrome.org.uk | Down's Syndrome Association - South West Thames Area |
United States , New Jersey , Woodbridge