The 15 Most Sustainable Cities In The US

Rachel Burris8-Minute Read
October 19, 2021

Given the devastating effects of climate change, we wanted to recognize the greenest cities in America and take a minute to appreciate the initiatives they’ve implemented to reduce their carbon footprint. Rocket HomesSM partnered with to analyze the 60 largest metropolitan areas in America (51% of the total U.S. population) and compile a list of the top 15 most sustainable cities that are leading the effort to preserve our planet for generations to come.

Finding The Most Sustainable Cities In The US

The researchers at used the following metrics to determine the rankings for the most sustainable cities in the U.S.:

  • Percent of state power used from renewable sources
  • Square feet of LEED (Leadership in Energy and Environmental Design) buildings per capita
  • Square feet of green space per capita
  • Percent of commuters who use energy-efficient transportation
  • Average number of vehicles per household
  • Electric vehicles per capita
  • State composting laws
  • State beverage container deposit laws
  • Battery recycling legislation and state ranking of batteries recycled per capita

15. Phoenix, Arizona

  • Metro population: 4,948,203
  • Percent of renewable energy: 12%
  • Square feet of green space per person: 970.9
  • Percent of energy-efficient commuters: 11.3%


According to research conducted by Climate Central, the country’s fifth-largest city is one of the fastest-warming cities in the U.S. Given its desert location and the fact that the city receives just 7.5 inches of rain each year, water scarcity is a growing concern for Phoenix. However, aggressive sustainability efforts driven by the local government have helped land the city on our list. Phoenix ranks in the top 5% of the country for amount of green space per capita and is currently working to increase tree coverage 25% by 2030.

Check out homes for sale in Phoenix.

14. Honolulu, Hawaii

coastline in Honolulu
  • Metro population: 974,563
  • Percent of renewable energy: 10.6%
  • Square feet of green space per person: 321.8
  • Percent of energy-efficient commuters: 18.6%

Honolulu has been working to increase its carbon-free transportation options. The city’s bikeshare program is among the most used in the country, and the city ranks in the top 15% of all-electric vehicle registrations per capita in the country.

Check out homes for sale in Honolulu.

13. San Bernardino, California

The San Bernardino Valley on a sunny day
  • Metro population: 4,650,631
  • Percent of renewable energy: 14.5%
  • Square feet of green space per person: 401.5
  • Percent of energy-efficient commuters: 8.3%

San Bernardino may rank in the top 25% of the country for the percentage of power they use from renewable sources, but the city is still working to improve and further contribute to conserving the nation’s natural resources. Just 5 miles west, the Rialto Bioenergy Facility is being built. It will convert hundreds of tons of food and organic waste into renewable energy and fertilizer daily, promising to be the largest of its kind on the continent.

Check out homes for sale in San Bernardino.

12. New York, New York

Washington Sq. Park at dusk
  • Metro population: 14,172,514
  • Percent of renewable energy: 12.7%
  • Square feet of green space per person: 111.9
  • Percent of energy-efficient commuters: 52.8%

New York City may not be the largest city by square miles, but the densely packed urban jungle has the largest population on this list. With that said, big cities make for big savings when it comes to the consumption of our natural resources. The city’s compactness, walkability and access to efficient public transportation puts New York in the bottom 1% of the country for vehicle ownership and the top 1% for commuters who use energy-efficient means of transportation.

Check out homes for sale in New York City.

11. Silver Spring, Maryland

Row of colorful houses in Silver Spring, Maryland
  • Metro population: 1,310,235
  • Percent of renewable energy: 6.6%
  • Square feet of green space per person: 688.9
  • Percent of energy-efficient commuters: 21.7%

Silver Spring has been helping to lead the way in eco-friendly city planning. The area has more energy-efficient developments than over 10% of the country. Silver Spring has received many LEED Silver and Gold certifications for buildings ranging in use from libraries to residential towers. The city also ranks in the top 10% of the country for amount of green space per person, which helps lower its carbon emissions and improve air quality for its residents.

Check out homes for sale in Silver Spring.

10. Los Angeles, California

  • Metro population: 10,039,107
  • Percent of renewable energy: 14.5%
  • Square feet of green space per person: 229.3
  • Percent of energy-efficient commuters: 15.1%

Los Angeles takes recycling very seriously. The city has committed to achieving its “Zero Waste-to-Landfill” goal by 2025. In 2012, LA had already increased its landfill diversion rate to 76.4%. Thanks to the city’s extensive programs and over 30 years of effort, it boasts one of the highest recycling rates in the country. LA’s waste management efforts will continue to ramp up as the city limits the use of Styrofoam, plastic straws, disposable utensils and single-use takeaway containers over the next few years.

Check out homes for sale in Los Angeles.

9. Sacramento, California

Downtown photo of Sacramento, CA.
  • Metro population: 2,363,730
  • Percent of renewable energy: 14.5%
  • Square feet of green space per person: 333.7
  • Percent of energy-efficient commuters: 12.7%

Sacramento is focused on promoting the use of zero-emission vehicles with a plan to have 75,000 on their roads within the next few years. Electrify America has committed to providing the city with $44 million to increase the use of communal, electric modes of transportation. Thanks to the investment, Sacramento is gaining charging infrastructure for electric vehicles and electric car-sharing, along with electric bus and shuttle programs.

Check out home listings in Sacramento.

8. Denver, Colorado

Park photo in Denver, CO
  • Metro population: 2,967,239
  • Percent of renewable energy: 10.9%
  • Square feet of green space per person: 432.7
  • Percent of energy-efficient commuters: 15.7%

In 2019, Denver earned the LEED for Cities Platinum Certification, a program honoring communities that strive to enhance sustainability through urban planning, development and operations. The city has been seriously working to achieve its goal of 100% renewable electricity by the year 2030. As part of the effort, they are currently building solar gardens above municipal parking lots and rooftops. The power generated from the project will be made available to municipal buildings and low-income housing.

Check out home listings in Denver.

7. Boston, Massachusetts

Sailboats on the ocean in Boston
  • Metro population: 2,031,884
  • Percent of renewable energy: 7.2%
  • Square feet of green space per person: 350.9
  • Percent of energy-efficient commuters: 32.8%

Boston is in the top 5% of the country for residents who commute using energy-efficient modes of transportation and is more walkable than all but two other cities in the country. After meeting its 2020 carbon reduction goal 5 years early, Boston was able to reduce emissions by 60% more than planned. Thanks to the city’s efforts, the American Council for an Energy Efficient Economy ranked Boston as the most energy-efficient city in the country from 2013 – 2019.

Check out home listings in Boston.

6. San Francisco, California

Railcar between palm trees in San Francisco
  • Metro population: 1,648,122
  • Percent of renewable energy: 14.5%
  • Square feet of green space per person: 202.4
  • Percent of energy-efficient commuters: 41.8%

For over a decade, San Francisco has strictly enforced a recycling and composting mandate that requires residents to separate their waste into three bins for recyclables, compostables and landfill-bound items. As a result, San Fran has a diversion rate of 80%. Plus, the city’s wealth of public transit options and bike- and rideshare programs enable residents to travel without the need for a vehicle, which is why the city is in the bottom 3% of the country when it comes to car ownership.

Check out homes for sale in San Francisco.

5. Washington, D.C.

Washington DC
  • Metro population: 4,956,991
  • Percent of renewable energy: 40.2%
  • Square feet of green space per person: 383.2
  • Percent of energy-efficient commuters: 24.5%

Washington, D.C., is in the top 2% of the country for LEED-certified buildings. In the last decade, the city’s public schools have led the way in energy-efficient construction. As the U.S. capital continues to reduce greenhouse gas emissions, the city is now working toward creating net-zero energy schools that produce as much energy as they consume. Washington, D.C., also invested in wind and solar power to generate energy for municipal and residential buildings, helping push the city into the top 3% of the country for renewable energy.

Check out homes for sale in Washington, D.C.

4. San Diego, California

coast line in San Diego
  • Metro population: 3,338,330
  • Percent of renewable energy: 14.5%
  • Square feet of green space per person: 483.3
  • Percent of energy-efficient commuters: 13.6%

San Diego has found a way to help combat California’s increasingly frequent droughts. Through the Claude “Bud” Lewis Carlsbad Desalination Plant, the area has been able to transform ocean water into viable drinking water through reverse osmosis. The plant processes 100 million gallons of salt water each day, providing San Diego residents with 50 million gallons of potable water. While this new technology does increase greenhouse gas emissions, the city has still managed to decrease emissions by 25% in just under a decade.

Check out homes for sale in San Diego.

3. St. Paul, Minnesota

Riverwalk in St. Paul
  • Metro population: 3,654,908
  • Percent of renewable energy: 15.8%
  • Square feet of green space per person: 729.8
  • Percent of energy-efficient commuters: 13.7%

Although the state of Minnesota has committed to reducing greenhouse gas emissions 80% by 2050, St. Paul has taken their efforts a step further, planning to achieve carbon neutrality by the same time. As part of its sustainable development strategy, the city has turned its attention toward large buildings, as their energy use makes up 40% of St. Paul’s emissions. To help ensure Minnesota’s capital achieves its goal, the city now requires owners of these buildings to track and report their energy and water use.

Check out homes for sale in St. Paul.

2. Seattle, Washington

Space needle in the Seattle skyline
  • Metro population: 3,074,865
  • Percent of renewable energy: 46%
  • Square feet of green space per person: 325.1
  • Percent of energy-efficient commuters: 24.2%

Seattle may be known as the Emerald City because of its year-round greenery, but the nickname is even more appropriate given the city’s extensive green efforts. Seattle is home to the nation’s first carbon-neutral utility company, Seattle City Light. Because of the company’s hydroelectric dams, the city ranks in the top 2% of the country for renewable energy. Meanwhile, Seattle’s top employers are also doing their part. While Amazon plans to achieve net-zero carbon emissions by 2040, Microsoft has set its sights on becoming carbon negative by 2030.

Check out home listings in Seattle.

1. Portland, Oregon

Portland, Oregon at sunset
  • Metro population: 2,492,412
  • Percent of renewable energy: 49.1%
  • Square feet of green space per person: 472.5
  • Percent of energy-efficient commuters: 19.6%

Portland is a city revered for its eco-consciousness, so it’s no wonder it gets the honor of being named the greenest city on this list. It is in the top 1% of the country for the power it generates from renewable sources. One of their largest energy efficiency projects to date has been converting 45,000 streetlights to use LED technology. Now, the city’s streetlights and traffic signals use 66% less energy than they did back in 2006, and Portland saves $1.5 million annually. Through its recycling and composting efforts, Portland recovers 81% of all waste produced by city operations and is on track to recover up to 90% by the year 2030.

Check out homes for sale in Portland, OR.

Methodology: Finding The Greenest Cities In The US

To determine the greenest cities in the U.S., we began by analyzing the 60 largest metropolitan areas in the country United States. These 60 places have a population of 1 million or greater and are home to 51% of all U.S. residents.

We collected and analyzed statistics in 10 key areas, which give insight into the local importance given to a green and sustainable lifestyle. In some cases, we used state-level data either because data is not recorded at the local level or policies are made by the state and affect the state as a whole. Such was the case for the data used to examine energy consumption.

Each data metric was normalized and transformed to a common range of 0 – 100 for the purposes of scoring and comparison. Weights were applied to each metric to reflect its level of importance in the study. The weighted scores for each metric were then summed and sorted to produce the final rankings.

Metric Weight Level  Source
LEED buildings – square feet per capita 21% City U.S. Green Building Council
Green commute 11% City American Community Survey – U.S. Census Bureau
Green Space – square feet per capita 21% City ESRI Inc.
Car ownership – average per household 5% City American Community Survey – U.S. Census Bureau
Percent of renewable energy 21% State U.S. Energy Information Administration
Electric vehicles per capita 5% State National Renewable Energy Laboratory (NREL)
State beverage container deposit laws 5% State National Conference of State Legislatures
Battery collections – ranking of batteries recycled per capita 3% State
Batter recycling legislation 3% State
Composting regulations 5% State U.S. Composting Council

The Bottom Line

Thanks to an increasing interest in sustainable living among young buyers, cities across the country are ramping up their green initiatives, and these 15 locales are leading the way.

For more information on sustainability, check out these sustainable living tips.

Rachel Burris

Rachel Burris is a writer covering topics of interest to present and future homeowners, as well as industry insiders. Prior to joining Rocket Companies, she worked as an English teacher for the New York City Department of Education and a licensed real estate agent for Brown Harris Stevens. She holds a bachelor's degree in creative writing from Bucknell University, a postbaccalaureate certificate in psychology from Columbia University and a master's degree in English education from Teachers College, Columbia University.