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The total value of assessed property in Contra Costa County increased by more than $10 billion over the last year, helped by gains in Danville, San Ramon, unincorporated San Ramon Valley and even a sliver of the Livermore Valley, according to the annual assessment roll.
The 2025-26 assessment roll marks the highest ever in the county’s history, according to an announcement from Assessor Gus Kramer’s office earlier this month, citing a total value of $290.66 billion – a $11.67 billion increase, or 4.18%, over last tax year.
Danville was among the municipalities seeing a percent increase in growth beyond the countywide average at 5.28%, ranking No. 2 just behind the highest percent increase in the county’s municipalities in San Pablo at 5.81%. San Ramon’s 4.46% increase was also slightly above the countywide average.
But although its year-over-year rate increase was modest compared to Danville’s, San Ramon stands out as having the highest overall assessed value of all Contra Costa County cities, with a total property tax base of $29.6 billion, up by $1.26 billion over the prior year – which was the highest dollar amount increase countywide over 2024-25.
While Danville saw a higher percentage increase than its neighbor to the south, that translates into a dollar increase of approximately $950 million and a total tax base of $18.9 billion.
Increases in assessed value reflect both the appreciated value of existing properties, as well as new properties, making areas with high growth such as San Ramon major players in the historic high reflected in the current year’s assessment roll.
“The total number of assessed parcels now stands at 382,022, an increase of 1,341 parcels compared to the previous year,” Kramer said in a July 1 press release. “This growth reflects ongoing development and investment throughout Contra Costa County.”
Walnut Creek was second behind San Ramon in total value growth over the past year, with a more than $1 billion increase, with Danville coming in third across municipalities in the county in terms of dollar amount increase.
For non-incorporated communities, the San Ramon Valley overall also saw the highest dollar amount growth over the past year, with a $727 million increase and a tax base of $19.2 billion, the highest non-city total in the county. The North West County area, with a tax base of $4.8 billion, saw the second highest dollar amount increase at $352 million.
In terms of percentage increases, the sliver of the Livermore Valley that sits in Contra Costa County saw the second highest percentage growth, up by 14.73% – second to a 25.5% increase in the Pittsburg area – or $13.7 million on its $107 million tax base.
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