Each Rowland DNA group has its own page. The location-based names attempt to identify the earliest known locations of a particular line. Each group’s letter designation is static (permanent), while the location-based name may change over time as we learn more about each group.

Rowland Xref Project Summary — A summary of all DNA groups and their trees

DNA Group A — Shenandoah Virginia Area

DNA Group B — Early Chester Co, PA circa 1762

DNA Group C — Granville Co, NC/Simpson Co, KY

DNA Group D — Iowa/PA/NC

DNA Group E — CT-NY Line (Fairfield Co, CT)

DNA Group F — Early Botetourt Co, VA

DNA Group G — Derbyshire County and Sheffield, England (Sleigh)

DNA Group H — Early Johnston/Wake Co, NC

DNA Group I — Early Locations in PA/OH (Germanic/Swiss)

DNA Group J — Colonial Surry Co, VA Area

DNA Group K — Saline County, Arkansas 1860s

DNA Group L — England William (1795- ) to Canada

DNA Group M — Essex, England

DNA Group N — County Mayo, Ireland

DNA Group O — Isle of Wight, England

DNA Group Ungrouped — Unmatched Test Takers (aka Groups of One) where the genealogical family has been defined.

DNA Group Untested — Defined Genealogical Families Without Test Takers.