Located in the San Bernardino County of California in the US, Ontario city lies 56 kms east of Los Angeles and is also a part of the Greater Los Angeles area.Ontario covers a total area of 129 km2 of which only a negligible 0.13% is water. Ontario has semi-arid weather conditions with very hot summers and warm winters.Ontario has one of the busiest airports of United States, the Ontario International Airport.
The 2010 US Census reported its population at 163,924 with an average density of 3278 people per square mile, making it the fourth most populous city of the County after San Bernardino, Fontana and Rancho Cucamonga. The racial makeup comprises of 51% White, 6.4% Afro-Americans, 1% Native Americans, 5.2% Asians, 0.3% Pacific Islanders and 31.3% of other races.
Ontario is a 'health resort' city. Besides this, agricultural and dairy farming, manufacturing industries, service industries, warehousing and clothing companies provide major opportunities of livelihood for the inhabitants.