401 County Road 315 None is located in Jarrell, Texas, in Williamson County. Williamson County is the northern anchor of the Austin metro, encompassing Round Rock, Georgetown, Cedar Park, and Leander, communities that have experienced some of the fastest residential growth in the nation over the past decade. The county's western edge retains significant ranch and acreage character as the Hill Country transitions to the urban core.

The San Gabriel River flows through Georgetown and the northern reaches of the county. The terrain transitions from the limestone hills of the western county to the Blackland Prairie in the east. Stillhouse Hollow Lake on the Lampasas River sits on the Williamson-Bell county boundary, offering recreation within easy reach of the northern suburbs.

Jarrell had an estimated population of 2,589 as of 2023. The 76537 zip code has a median household income of $96,067, a median home value of $272,200, and a median age of 30.7. The average household size is 2.88 people.

Major employers include Dell Technologies (headquartered in Round Rock), Amazon, healthcare systems, and a massive retail and service sector supporting one of Texas's most affluent suburban populations. Georgetown consistently ranks among the fastest-growing cities in America, and the county's western acreage properties attract buyers seeking rural character with urban access.