1880Architecture
The first post office opened in 1880.
1911History
The Atwater Signal was first published in 1911.
1922Government
Atwater incorporated in 1922.
1991Government
Castle was selected for closure under the 1991 Base Realignment and Closure Commission and the base closed September 30, 1995.
2020Disaster
On May 15, 2020, Atwater declared itself a business "sanctuary city" during the coronavirus pandemic.
2023History
The median household income in 2023 was $63,945, and the per capita income was $30,133.