Weir is a city in Williamson County, Texas, United States. The population was 699 at the 2020 census.
Geography
Weir is located at (30.675007, –97.587862), approximately six miles northeast of Georgetown and 30 miles north of Austin.
According to the United States Census Bureau, the city has a total area of 1.6 square miles (4.1 km<sup>2</sup>), all land.
Demographics
As of August 2025, Weir's current mayor is John Fox.
2020 census
As of the 2020 census, Weir had a population of 699. The median age was 35.6 years. 30.5% of residents were under the age of 18 and 13.0% of residents were 65 years of age or older. For every 100 females there were 111.2 males, and for every 100 females age 18 and over there were 112.2 males age 18 and over.
0.0% of residents lived in urban areas, while 100.0% lived in rural areas.
There were 226 households in Weir, of which 46.9% had children under the age of 18 living in them. Of all households, 57.5% were married-couple households, 15.0% were households with a male householder and no spouse or partner present, and 20.8% were households with a female householder and no spouse or partner present. About 7.1% of all households were made up of individuals and 3.5% had someone living alone who was 65 years of age or older.
! Race !! Number !! Percent
|-
| White || 349 || 49.9%
|-
| Black or African American || 8 || 1.1%
|-
| American Indian and Alaska Native || 1 || 0.1%
|-
| Asian || 5 || 0.7%
|-
| Native Hawaiian and Other Pacific Islander || 0 || 0.0%
|-
| Some other race || 132 || 18.9%
|-
| Two or more races || 204 || 29.2%
|-
| Hispanic or Latino (of any race) || 378 || 54.1%
|}
2000 census
As of the census Calvin Weir's son Horace M. Weir was also Weir's first Postmaster
In the late 19th century, the communities of Weir and Townsville (or Towns Mill) grew around these early settlers. Churches included Baptist and Presbyterian congregations that met at the prairie springs school, as well as an African American church that met in a school near Mankins Crossing. Calvin Weir's daughter, Lucy, served as postmaster at the post office in Townsville, where she also ran a small store.
The communities developed similarly until 1893, when the Georgetown and Granger Railroad came through Weir, bypassing Townsville. In 1903, after the Missouri, Kansas and Texas Rail-Road (MKT) bought the line, known as the Katy, most area residents moved into the town of Weir, officially established that same year. The Katy Lake Resort, created by MKT on the river at Towns Mill Dam, attracted tourists to the area. The Townsville post office moved to Weir, and with several new businesses, the town began to thrive.