Bloomington is an urban unincorporated community in San Bernardino County, California, United States.

For statistical purposes, the United States Census Bureau has defined Bloomington as a census-designated place (CDP).

Though currently unincorporated, many of the town's political activists are pushing for Bloomington to attain cityhood, while the nearby cities of Rialto and Fontana are attempting to annex the community.

In 1907, the Riverside Portland Cement Company built a large plant near the Crestmore Quarries (South Bloomington), and to provide transportation for employees built a standard gauge railroad to Riverside.

The Pacific Electric Crestmore Line (Riverside–Rialto) provided local service for many years.

It failed in late February and early March, when the Local Agency Formation Commission denied an extension that BIC needed in order to pay a $109,000 deposit for feasibility and financial studies.

[5] In 2022, there was protest by community members, when the county approved to destroy an elementary school in favor of a warehouse[6][7] In 2024, community members protested the demolition of 117 homes in favor of warehouses that were approved by the county supervisors[8][9][10] In late September 2024, a San Bernardino County Superior Court Judge halted all construction on the Bloomington Business Park, finding that the San Bernardino County officials had failed to conform to state law in its Environmental Review by not sufficiently informing stake-holders (decision-makers and the public) of the environmental consequences of the proposed development.

The County will have to re-do the Environmental Review so as to conform to State Law.

[1] According to the United States Census Bureau, the CDP has a total area of 6.0 square miles (16 km2), all land.

Bloomington has a large Nazarene church and Christian Elementary School and Preschool.

According to the 2010 United States Census, Bloomington had a median household income of $46,639, with 22.2% of the population living below the federal poverty line.

[31] The town of Bloomington is served by Omnitrans bus service[32] and Interstate 10 (San Bernardino Freeway).

It is also crossed by the Union Pacific Railroad Alhambra Subdivision and home to a hump yard.