Klein
- Descendants of Jacob Klein from Frederick County, MD USA; compiled by Diana Seebode.
- http://worldconnect.rootsweb.com/cgi-bin/igm.cgi?db=jklein

Klein-Mouring-Summerford-Stephens
- Family history of Stephen P Klein in database format.
- http://worldconnect.rootsweb.com/cgi-bin/igm.cgi?db=sk205

Klein, Mansfield and Affiliated Families
- Ancestral research as compiled by Vicki Klein.
- http://worldconnect.rootsweb.com/cgi-bin/igm.cgi?db=kmtree

Klein-Wahnsiedler-Koester-Hanagan-Kreilein
- Family index featuring ancestors and descendants as compiled by Barbara Klein.
- http://worldconnect.rootsweb.com/cgi-bin/igm.cgi?db=:772804

Klein, Lundelius, Faiella and Sherman
- Family of Barbara Klein.
- http://worldconnect.rootsweb.com/cgi-bin/igm.cgi?db=:2717380

Klein/Barnet/Foster/Watts/Homfeld/Schuenemann/Osborn
- Ancestral database as compiled by Patricia Stratton.
- http://worldconnect.rootsweb.com/cgi-bin/igm.cgi?db=:2239140

Klein Family
- Ancestral heritage of Gene Saul Klein of Indianapolis, IN USA.
- http://familytreemaker.genealogy.com/users/k/l/e/Gene-S-Klein/

Klein: Hoosier Home
- Researching the Indiana lineages of Creamer, Faust, Knauss and Tackett; includes affiliated families and state facts.
- http://freepages.genealogy.rootsweb.com/~vklein/

Kleins of Kansas
- Pierre (Pete) Klein of France circa 1882 and descendants. Includes the children Emile, Camile, Hattie, Frere, Henry, John and Maggie. Also researching Ellsworth Klein and Ruby Reiland.
- http://www.kleinsofkansas.com/