| Facts About Multiples | | Information on twins, triplets, quadruplets, quintuplets and higher order multiples. Features a database of multiple birth families, statistics, basic information on twinning, world records and information on fakers. |
| The International Twins Association | | A non-profit, family-oriented organization to promote the spiritual, intellectual, and social welfare of twins and multiples throughout the world. |
| Twin Connections | | Twin Connections celebrates the unique and mysterious bond between twins by providing a place for twins, and their families and friends, to share and read twin stories and photos, learn interesting twin facts and news and join an online twin community. |
| TwinMajority.org | | From 2127, most babies will be twins. This site explains why evolution predicts this. |
| Twins by Twins | | This site is built for all those that want to learn more about twins and is dedicated to those that are twins and proud of it. |
| Twins Network | | A resource for understanding twins and sharing information. Surveys, facts, news, trivia, links. |
| TwinsRealm.com | | Mirror twins from Australia share photos, twin stories, links and information on twin festivals and celebrations. |
| TwinStuff.com | | Bulletin boards, twin games, photo gallery, information for parents, TV and movie twins, twin events, and information. |
| Twinsworld | | Offerings include a twin casting agency, twin events, reunion of twins placed for adoption or separated at birth, message boards, links, photos, contests, and research. |
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