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Oakland, San Jose, and San Francisco hold the first, second, and third overall spots in WalletHub’s 2026 Greenest Cities in America ranking. The result refers to their positions in WalletHub’s weighted index—not a claim that they lead every environmental measure or that the index covers every aspect of sustainability.
Which California cities rank as the greenest?
WalletHub’s 2026 ranking puts Oakland first, San Jose second, and San Francisco third among the 100 most populated U.S. cities in its sample. Washington, D.C., ranks fourth. WalletHub says its data were collected as of September 2, 2026. See WalletHub’s 2026 ranking and methodology.
| City | Overall rank | Total score | Environment | Transportation | Energy sources | Lifestyle and policy |
|---|---|---|---|---|---|---|
| Oakland | 1 | 70.83 — WalletHub, 2026 | 9 | 17 | 8 | 8 |
| San Jose | 2 | 70.20 — WalletHub, 2026 | 7 | 16 | 9 | 22 |
| San Francisco | 3 | 69.94 — WalletHub, 2026 | 10 | 4 | 22 | 4 |
Scores are index totals, not percentages. Category positions are separate rankings within WalletHub’s sample and methodology; they should not be read as rankings of the cities in every possible environmental category.
What WalletHub’s ranking measures
WalletHub compares city proper, not the wider metropolitan areas, across four weighted dimensions. It evaluates 28 metrics, grades them on a 100-point scale, and calculates a weighted average for each city. Some metrics adjust population using its square root, which WalletHub says helps avoid overemphasizing small population differences.
#1 Best Overall
| Dimension | Weight in overall score |
|---|---|
| Environment | 40 points |
| Transportation | 20 points |
| Energy sources | 20 points |
| Lifestyle and policy | 20 points |
The indicators span topics such as air quality, per-capita greenhouse-gas emissions, urban heat, parkland, water, commuting, walkability, bicycle access, transit access to jobs, renewable electricity, solar installations, community gardens, green jobs, and local policies. The weights are not evenly distributed: the share of commuters who drive alone and the share of electricity from renewable sources each receive double weight among the listed metrics.
Why the category rankings differ
Oakland
Oakland’s overall first place does not mean it leads the environment category: it ranks ninth there, 17th in transportation, eighth in energy sources, and eighth in lifestyle and policy. WalletHub points to the city’s results for air quality and per-capita greenhouse-gas emissions, as well as measures related to bike-sharing, bicycle routes, gardens, farmers markets, and green jobs, in explaining its placement.
San Jose
San Jose ranks seventh for environment, 16th for transportation, ninth for energy sources, and 22nd for lifestyle and policy. WalletHub highlights its solar installations per capita and renewable-electricity share, alongside its heat-island measure and listed policies.
San Francisco
San Francisco’s strongest category positions are fourth in transportation and fourth in lifestyle and policy. It ranks 10th for environment and 22nd for energy sources. WalletHub’s discussion includes community-supported agriculture and community-garden measures, renewable electricity, water use, and the share of commuters who drive alone.
These are WalletHub’s explanations of its own results, not independent assessments of each city’s programs. The contrast among the category ranks shows why an overall composite score should not be treated as a claim that one city is best on every dimension.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the ranking leaves out
WalletHub says it excluded the availability and volume of recycling programs because comparable city-level data were unavailable. The ranking is therefore a score based on selected, weighted indicators—not an exhaustive sustainability audit. It also covers the city proper, so the results should not be extended to Oakland’s, San Jose’s, or San Francisco’s full metro areas.
California City News reported on October 1, 2026, that six California cities made WalletHub’s top ten: Oakland, San Jose, San Francisco, San Diego, Fremont, and Irvine. That summary adds statewide context, but WalletHub’s table is the source for the scores and detailed category positions. Read California City News’ October 1, 2026 report.
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