SacramentoPronunciation: /ˌsakrəˈmɛntəʊ/Definition of Sacramento 1a river of northern California, which rises near the border with Oregon and flows some 611 km (380 miles) southwards to San Francisco Bay. 2the state capital of California, situated on the Sacramento River to the north-east of San Francisco; population 463,794 (est. 2008). Sacramento in other Oxford dictionaries Definition of Sacramento in the US English dictionary