1528History
European colonist's first record of contact with tribe is in 1528.
1779Military
By 1779, the Karakawa were at war with Spanish settlers.
1790Military
In 1790 the war ended and shortly after settlement begins.
1875History
Crawford, Peter Black, and John Sills were the only recorded residents of Cane Island in 1875.
1895History
In 1895, James Oliver Thomas laid out a town, and in January 1896 the town of Katy was named through Thomas's post office application.
1898Government
It was established in 1898, and relocated to its present location in 1947.
1900Disaster
On September 8, 1900, the town's early efforts were swept clean by the Great Galveston Hurricane of 1900, the deadliest hurricane in U.S.
1921Culture
The city joined the county library system in 1921.
1940Architecture
The first Katy branch opened in 1940.
1943Architecture
Humble Oil opened the Katy Gas Field in 1943, which went on to become one of the principal suppliers of allied forces and eventually became one of the most productive gas fields...
1944Architecture
Katy later became known for rice farming; the first concrete rice driers in the state of Texas were built here in 1944 and still stand as landmarks.
1945Government
In 1945 the City of Katy was incorporated.
1966Military
The construction and opening of Interstate 10 in 1966 allowed for rapid development of the area, as Houston expanded westward.
1972Culture
The Friends of the Katy Library began in 1972.
2002Architecture
The construction of the current 15,000-square-foot (1,400 m2) branch began in 2002.
2003Government
Founded in 2003, the Katy Area Economic Development Council's (Katy Area EDC) mission is to establish the Katy area as the premier location for families and businesses through p...
2008Military
I-10 was widened further in 2008 to 14 lanes with TXDOT plans for additional widening forthcoming.
2009Education
BP America is headquartered in the Houston Energy Corridor and is the area's largest employer, with 5,500 employees on its Westlake campus as of 2009.
2010Architecture
In August 2010, H-E-B Food & Drug opened a new store at I-10 and Pin Oak.
2013History
In July 2013, Costco announced that it would open a store at the southwest corner of Grand Parkway and I-10 in 2014.
2014History
The new store was planned for completion by early spring 2014 and would be Costco's fourth Houston-area location.
2017Architecture
In 2017, Amazon constructed a 1 million-square-foot distribution center near the intersection of Highway 90 and Woods Road.
2018Government
In September 2018, Katy Asian Town, in proximity to the City of Katy, was established.
2019Architecture
Its construction was completed in 2019.
2020History
=== Racial and ethnic composition ===
=== 2020 census ===
As of the 2020 census, there were 21,894 people, 7,199 households, and 5,804 families residing in the city.
2021History
In 2021, it was estimated that new development projects were near completion to stimulate the local economy.
2025History
== Demographics ==
As of the 2025 ACS, the City of Katy has an estimated population of 25,184, with a median age of 38 years old.