Webfrom july 1, 2022, to july 1, 2023, 17 of california’s 58 counties experienced a population increase while the majority lost residents. But there are other reasons too. Webmore than half of california’s 58 counties lost population during that timeframe. Many of the counties seeing a reduction in population are in southern california and the bay area; Webcalifornia’s unprecedented population loss during the pandemic raises questions about what a shrinking or slowly growing population means for the state’s future. Websan francisco and santa clara counties see increases in residents, but alameda and san mateo drop. A drone view of traffic on highway 24 eastbound heading.