A new report finds that the use of electronic bill pay continuesto grow sharply among Americans but that there's still plenty ofpaper in the mail.

The report by Aite Group analyst Ron Shevlin– titled “Sizing E-Bill Adoption in the United States” – found thatnearly half of the 16.3 billion bills paid by Americans in 2013(totaling $4.3 trillion) were paid either online or by mobiledevice.

That's more than twice the number of bills paid through themail, Shevlin found, and he said from 2010 to 2013, digital billpayments grew from 37% of all bills paid to 49%.

“Despite the growth in bills paid through digital channels,consumers still receive many paper bills,” Shevlin added in thereport, which was based on analysis from a Q2 2013 Aite Groupsurvey of 1,242 U.S. consumers recruited to represent overall age,income, geographic and gender distribution.

The Aite Group analyst found that Americans paid 21% of allbills in 2013 without receiving a paper statement.

Roughly two-thirds of U.S. consumers received at least one oftheir bills in e-bill format last year. Among them, three-quarters stoppedreceiving paper bills for at least one type of bill.

But, Shevlin added, “The paper turnoff rate is nowhere nearwhere billers would like it to be.”

Other findings in the report include that billers' websites andmobile apps were the sources of about half of all e-bills and thatas a percentage of all bills, the cell phone, student loan, andcable TV industries lead the way in e-bill adoption, with e-billsaccounting for roughly four in 10 of the bills paid by consumers inthese categories.

“Of home insurance and education bills, however, just about onein five bills paid were sent in e-bill format. And among medicaland tax bills, e-bills accounted for only about one in 10 of thebills paid,” the report said.

The think firm's report also found that nearly three-quarters ofGen Yers, two-thirds of Gen Xers, almost six in 10 baby boomers,and 56% of seniors received at least one e-bill in 2013. The reportsaid that more than half of both Gen Xers and Gen Yers turned offpaper bills for at least one of the bills they received in e-billformat.