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 .
[['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 % )']]
( a ) includes illinois-american water company , which we refer to as ilawc and american lake water company , also a regulated subsidiary in illinois. .

Question: what is the approximate customer penetration in the pennsylvania market area?
Answer: 30%