What’s so special about Williamson County, Texas? Williamson County is the fastest growing part of the Austin/Georgetown, Texas Metropolitan Area. It’s been booming here in recent years, with so much business growth and momentum it is consistently ranked among the fastest growing counties in the United States. Even now — in the midst of a national economic slowdown — Williamson County is still way ahead of the pack. At current growth rates, the census bureau estimates Williamson County’s population will overtake Travis County’s in 15 to 20 years! This exploding population needs everything, (click here for market demographics).