About 8 percent of North Dakota's telephone subscribers registered for the "do-not-call" list in its first two available days, said Liz Brocker, a spokeswoman for the attorney general.
By 4:40 p.m. Friday, 19,000 of the state's 231,000 residential telephone subscribers had requested to be added to the list, Brocker said.
Online registration began Thursday.
Registrations came in at a rate of 1,000 phone numbers an hour Friday and 500 numbers each hour Thursday, said the attorney general's office.
Consumers can register at www.ag.state.nd.us . Registration will also be available through a toll-free telephone number within the next two or three weeks.
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That number has not yet been released.
The state law restricting telemarketers takes effect Aug. 1. However, charities that use their own employees to solicit and companies that have had a business relationship with the customer within the past two years are exempt from the restriction.
Minnesota and South Dakota also offer "do-not-call" lists.