I haven't seen an official list, but here's what I've got from looking at multiple sites. It's nowhere near a complete list, the Cowboys can have in as many of these local guys as they desire. Players who live in the area or played high school or college football in the area qualify.
David Blough, QB, Purdue
Xavier Turner, RB, Tarleton State
Aca'Cedric Ware, RB, USC
Devine Ozigbo, RB, Nebraska
Damarcus Lodge, WR, Ole Miss
Alex Wesley, WR, Northern Colorado
Jalen Guyton, WR, North Texas
Lil'Jordan Humphrey, WR, Texas
Keaton Sutherland, OG, Texas A&M
Patrick Vahe, OG, Texas
Greg Little, OT, Ole Miss
Ben Banogu, DE, TCU
Markus Jones, DE, Angelo State
L.J. Collier, DE/DT, TCU
Charles Omenihu DE/DT, Texas (Bryan Broaddus said he was attending on the Draft Show)
Kingsley Keke, DT, Texas A&M (some have as Dallas Day, others official 30 visit)
Daniel Wise, DT, Kansas
Ty Summers, LB, TCU
Landis Durham, LB, Texas A&M
Derrek Thomas, CB, Baylor (some have as Dallas Day, others official 30 visit)
Jordan Wyatt, CB, SMU
Marco Orozco, K, Grambling