| Canadian Down Syndrome Association (Canadian) |
| www.cdss.ca |
| Down Syndrome Association of Toronto (Canadian) |
| www.dsat.ca |
| Uno Mas! Down Syndrome Online (United States) |
| www.unomas21.com |
| Riverbend Down Syndrome Parent Support Group |
| www.altonweb.com/cs/downsyndrome/index.htm |
| National Down Syndrome Congress (United States) |
| www.ndsccenter.org |
| List of World Wide Down Syndrome Associations |
| www.meiogen.com/downlink1.html |
| National Association for Down Syndrome (United States) |
| www.nads.org |
| Dr. Len Lenshin - Down Syndrome Health Issues |
| www.ds-health.com |
| DHG - Down Heart Group - Extensive information on Heart Issues |
| www.dhg.org.uk |
| London Down Syndrome Asssociation |
| www.ldsa |