To rank each of the states, the USGBC used 2010 U.S. Census data to create the per-capita list.
Together, the 10 states accounted for 1,777 LEED projects that included 226.8 million square feet of certified space.
Here's the list of the states that are the most "green":
1. Illinois — 2.29 square feet per person.
2. Maryland — 2.20 square feet per person.
3. Virginia — 2.11 square feet per person.
4. Massachusetts — 2.09 square feet per person.
5. New York, California — 1.95 square feet per person.
6. Oregon — 1.83 square feet per person.
7. North Carolina — 1.80 square feet per person.
8. Colorado — 1.77 square feet per person.
9. Hawaii — 1.17 square feet per person.
10. Minesotta — 1.55 square feet per person.
Out of the 10 states, California and New York ranked fifth but they are also the two most populous states out of the group with 37,253,956 and 19,378,102, respectively. The next closest state in population was Illinois, with 12,830,602. Hawaii was the least populous with 1,360,301.
Even though the entire list falls within 2.29 and 1.55 square feet per person of LEED-certified space, consider the population of California. The number of LEED projects and the amount of square footage needed for the state to even make the list is staggering in comparison to others.
In 2013, more than 32 percent of the LEED-certified space in the U.S. was built in California and its 595 projects accounted for more than 33 percent of the entire country's LEED-certified projects.
It seems like the percentage of the total of LEED-certified space and volume of projects is a better indicator of the most "green" state.
Something else worth noting about the data: Washington D.C.
The nation's capital had 32.45 square feet of green space per person in 2013. Granted, the population of Washington D.C. is only 601,723 people, but it is also a very small geographic area.
Data for other cities and metropolitan areas was not included in the graph but the concentration of LEED projects and space in Washington D.C. is high.