part i item 1 . business our company founded in 1886 , american water works company , inc. , ( the 201ccompany , 201d 201camerican water 201d or 201caww 201d ) is a delaware holding company . american water is the most geographically diversified , as well as the largest publicly-traded , united states water and wastewater utility company , as measured by both operating revenues and population served . as a holding company , we conduct substantially all of our business operations through our subsidiaries . our approximately 6400 employees provide an estimated 15 million people with drinking water , wastewater and/or other water-related services in 47 states and one canadian province . operating segments we report our results of operations in two operating segments : the regulated businesses and the market- based operations . additional information with respect to our operating segment results is included in the section entitled 201citem 7 2014management 2019s discussion and analysis of financial condition and results of operations , 201d and note 18 of the consolidated financial statements . regulated businesses our primary business involves the ownership of subsidiaries that provide water and wastewater utility services to residential , commercial , industrial and other customers , including sale for resale and public authority customers . we report the results of this business in our regulated businesses segment . our subsidiaries that provide these services are generally subject to economic regulation by certain state commissions or other entities engaged in economic regulation , hereafter referred to as public utility commissions , or 201cpucs , 201d of the states in which we operate . the federal and state governments also regulate environmental , health and safety , and water quality matters . our regulated businesses segment operating revenues were $ 2674.3 million for 2014 , $ 2539.9 for 2013 , $ 2564.4 million for 2012 , accounting for 88.8% ( 88.8 % ) , 90.1% ( 90.1 % ) and 89.9% ( 89.9 % ) , respectively , of total operating revenues for the same periods . the following table sets forth our regulated businesses operating revenues , number of customers and an estimate of population served as of december 31 , 2014 : operating revenues ( in millions ) % (  % ) of total number of customers % (  % ) of total estimated population served ( in millions ) % (  % ) of total .
( a ) includes illinois-american water company , which we refer to as ilawc and american lake water company , also a regulated subsidiary in illinois. .
OperatingRevenues(In millions) % of Total Number ofCustomers % of Total EstimatedPopulationServed(In millions) % of Total
New Jersey $652.3 24.5% 648,066 20.2% 2.7 22.7%
Pennsylvania 605.4 22.6% 666,415 20.7% 2.2 18.5%
Missouri 270.2 10.1% 464,498 14.4% 1.5 12.7%
Illinois (a) 262.3 9.8% 312,017 9.7% 1.3 10.9%
California 209.8 7.8% 174,198 5.4% 0.6 5.0%
Indiana 200.6 7.5% 293,666 9.1% 1.2 10.1%
West Virginia (b) 127.0 4.7% 170,371 5.3% 0.6 5.0%
Subtotal (Top Seven States) 2,327.6 87.0% 2,729,231 84.8% 10.1 84.9%
Other (c) 346.7 13.0% 489,961 15.2% 1.8 15.1%
Total Regulated Businesses $2,674.3 100.0% 3,219,192 100.0% 11.9 100.0%
new jersey operatingrevenues ( in millions ) $ 652.3 % (  % ) of total 24.5% ( 24.5 % ) number ofcustomers 648066 % (  % ) of total 20.2% ( 20.2 % ) estimatedpopulationserved ( in millions ) 2.7 % (  % ) of total 22.7% ( 22.7 % )
pennsylvania 605.4 22.6% ( 22.6 % ) 666415 20.7% ( 20.7 % ) 2.2 18.5% ( 18.5 % )
missouri 270.2 10.1% ( 10.1 % ) 464498 14.4% ( 14.4 % ) 1.5 12.7% ( 12.7 % )
illinois ( a ) 262.3 9.8% ( 9.8 % ) 312017 9.7% ( 9.7 % ) 1.3 10.9% ( 10.9 % )
california 209.8 7.8% ( 7.8 % ) 174198 5.4% ( 5.4 % ) 0.6 5.0% ( 5.0 % )
indiana 200.6 7.5% ( 7.5 % ) 293666 9.1% ( 9.1 % ) 1.2 10.1% ( 10.1 % )
west virginia ( b ) 127.0 4.7% ( 4.7 % ) 170371 5.3% ( 5.3 % ) 0.6 5.0% ( 5.0 % )
subtotal ( top seven states ) 2327.6 87.0% ( 87.0 % ) 2729231 84.8% ( 84.8 % ) 10.1 84.9% ( 84.9 % )
other ( c ) 346.7 13.0% ( 13.0 % ) 489961 15.2% ( 15.2 % ) 1.8 15.1% ( 15.1 % )
total regulated businesses $ 2674.3 100.0% ( 100.0 % ) 3219192 100.0% ( 100.0 % ) 11.9 100.0% ( 100.0 % )