Some 3,847 people used the Fundraising Preference Service to make 11,890 suppression requests between November 2017 and October 2018, according to figures published by the Fundraising Regulator.
A total of 988 separate charities received a request to stop contacting people. Nearly a quarter of requests were made on behalf of another person.
Ten people used the service to end contact with more than 50 charities each. But the regulator said that on average people ask to end contact with three charities.
The service launched in July 2017, and in the period to the end of March 2018 received nearly 20,000 requests from 5,700 people. However, the majority of these requests were made in the early days of the service.