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Rowland Heights is an unincorporated community of 11.4 square miles (30 km2), located in and below the Puente Hills in the San Gabriel Valley, in Los Angeles County, California.

The population of the census-designated place (CDP) was 48,553 at the 2000 census. Because Rowland Heights is an unincorporated community instead of an incorporated city, it is dependent upon County of Los Angeles representation

Rowland Heights has grown significantly during the 1990s. Originally built on a pig farm that covered much of modern day Rowland Heights, the Rowland Homestead was mostly orange groves until the eastward sprawl from Los Angeles spawned working-class communities and affordable housing developments then formed.

As the 60 freeway was extended beyond the western boundary, the community continued growth equal to that of most communities in Southern California. Development next to the freeway, zoned for industrial investment, eventually helped to support the housing developments that continued well into the 21st century.