A decade of public spending data across California's regions, exploring how cities allocate resources, where per-capita spending is highest, and what population trends reveal about fiscal priorities.
How has each region grown over the decade? Population shifts directly affect how much cities spend per resident.
Southern California dominates by population, with 18.9M residents across tracked cities in 2023 vs. 9.4M in Northern California. Central California holds 3.4M, and the entire Sierra Nevada region has just 120,000, smaller than many individual cities. This population gap is the single biggest driver of how per-capita spending differs across regions.
Where does California's total public spending actually go? This breakdown shows each region's share of cumulative expenditure over the full decade.
Southern California accounts for 55.6% ($505B) of total expenditure across the decade, followed by Northern California at 37.5% ($341B). Central California and Sierra Nevada together make up the remaining 7%. However, Southern California's average is heavily skewed by Vernon, an industrial city of ~100 residents with per-capita spending exceeding $2M in some years. The median tells a different story: SoCal's median per-capita ($1,343) is actually lower than Sierra Nevada ($2,198), highlighting how a single outlier can distort regional comparisons.
The heatmap reveals year-over-year spending intensity across all four regions. Darker cells indicate higher average per-capita expenditure.
Northern California saw the sharpest growth of any region, with average per-capita spending rising 116% from $1,759 in 2013 to $3,791 in 2023, more than doubling. Central California (+53%) and Sierra Nevada (+51%) grew at roughly half that rate. Southern California is the outlier in the other direction: average per-capita fell 15% over the decade, from $13,326 to $11,370, though this is driven almost entirely by Vernon's extreme early-decade numbers masking the broader trend. All regions show an uptick around 2020–2021, consistent with pandemic-era emergency spending.
Within each region, which cities are the highest and lowest spenders? This comparison surfaces the outliers driving regional averages.
The within-region spread is enormous. In Northern California, Mountain View averages $45,645 per capita, nearly 70x more than Citrus Heights at $660. In Southern California, Vernon ($1.5M average) and Industry ($486K) are industrial enclaves with tiny resident populations but massive tax bases, making direct comparison with residential cities misleading. Excluding these outliers, the top-to-bottom ratio across regions is roughly 10:1, suggesting city size and economic character matter far more than regional location for predicting per-capita spend.
Does population size predict how much a city spends per resident? Use the filter to explore patterns within each region.
The scatter confirms a strong inverse relationship: smaller cities consistently spend more per resident. Southern California's average is distorted by Vernon (population ~100, per-capita spend >$1M) and Industry, filtering to other regions makes the pattern far clearer. Sierra Nevada cities cluster in the upper-left (small population, high per-capita), while large Southern California cities like Los Angeles sit in the lower-right (high population, moderate spend). The takeaway: population size is a better predictor of per-capita expenditure than regional geography.