Collin County is a county located in the
U.S. state of
Texas. As of 2000, the population was 491,675
although a 2005 estimate puts the population at
659,457. Its county seat is
McKinney. This county is part of the Dallas Fort
Worth Metroplex and lies just north of
Dallas County.
The primary cities in this
fast growing county are
McKinney,
Plano,
Allen,
Frisco,
Richardson,
Wylie , and a small part of
Dallas. Collin County, and its county seat of
McKinney, are named after Collin McKinney, one of
the five men who drafted the Texas Declaration of
Independence and the oldest of the 59 men who signed
it.