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Oakland, California, has landed in first place on WalletHub’s 2026 ranking of the greenest cities in America. The title surprised some people, since the Bay Area’s usual green poster child has often been San Francisco.
The ranking rests on a set of measurable categories rather than reputation. Here is what the study looked at, how Oakland performed, and which other cities finished near the top.
Oakland takes the top spot
WalletHub’s 2026 Greenest Cities in America report, released September 30, named Oakland the greenest city in the country, followed by San Jose and San Francisco. Washington, D.C., and Honolulu rounded out the top five.
Oakland earned an overall score of 70.83 out of 100, edging out San Jose’s 70.20 and San Francisco’s 69.94. The gaps at the top were small, so the order could easily shift in a future edition.
How the ranking was built
WalletHub compared the country’s 100 largest cities across 28 measures of environmental friendliness, including greenhouse-gas emissions, air quality, renewable energy, public transportation, and access to green space. It’s a broad checklist, not a single pollution score.
The measures are grouped into environmental quality, transportation, energy sources, and lifestyle and public policy. Each city received a score of up to 100 points.
Air quality that leads the pack
Clean air is the headline strength here. Oakland ranks as the greenest city in America, with the country’s second-lowest greenhouse gas emissions and best air quality.
Not every outlet words it identically. AOL’s coverage describes the city as tied for the cleanest air among the cities studied. Either way, Oakland sits at the very top of the field on this measure.
More than 12% parkland
More than 12% of Oakland is designated as parkland. That figure is a share of the city’s land area, and it’s the number in this story’s headline.
It isn’t an outlier at the national level, though. WalletHub placed that share at the 30th highest among the 100 cities in its study. Oakland’s overall win came from strength across many categories, not parkland alone.
From Lake Merritt to the redwoods
The parkland covers very different landscapes. It stretches from urban Lake Merritt to the towering redwoods of Joaquin Miller Park.
That range matters for residents. A lakeside loop and a hillside redwood trail are both within the same city limits, which is part of what the parkland number is capturing.
Low emissions and dark skies
Emissions are the other pillar of Oakland’s score. The city has the second-lowest per-capita greenhouse gas emissions in the nation.
There’s a quieter bonus too. Oakland also has low light pollution, allowing residents to better see the night sky.
Everyday green infrastructure
Day to day, the ranking also reflects how people get around and eat. The city offers bike-sharing, numerous bike lanes and paths, community gardens, farmers’ markets and a growing number of green job opportunities.
These features don’t produce headline numbers on their own. Still, they feed the transportation and lifestyle categories that helped carry Oakland to first place.
San Jose and San Francisco close behind
San Jose took second place largely on energy. It has the fifth-highest number of solar panel installations per capita, and over half of its electricity comes from renewable sources. It also has the country’s fourth-lowest Urban Heat Island Effect Index.
San Francisco placed third. It stood out for high numbers of community gardens, farmers’ markets and renewable energy sources, as well as low water consumption.
California’s strong showing
California claimed six of the top 10 spots in the 2026 ranking. San Diego landed at No. 6, while Fremont and Irvine ranked seventh and eighth, respectively.
Los Angeles did less well. It doesn’t crack the top 20. Rankings like this also change by year and method, since an earlier WalletHub edition had San Diego as the greenest city in America.
