Plum Grove is a city in Liberty County, Texas, United States.

[3] In 2015, residents of Plum Grove addressed the Liberty County Commissioners Court, stating concerns with the expansion of Colony Ridge.

[5] According to the United States Census Bureau, the city has a total area of 7.3 square miles (19 km2), all land.

In the 2020 census, amidst a large influx of mostly Hispanic residents from elsewhere in Greater Houston,[19] the population doubled from a decade prior to 1,245.

[20] Plum Grove is served by the Cleveland Independent School District.