More than 1,500 people in Epping Forest were contacted by the NHS Covid-19 app and told to isolate in the latest week for which figures are available.
The app warns people that they have been in close contact with someone who has tested positive for coronavirus.
People contacted through the app are advised to isolate for up to 10 days, although there is no legal obligation.
NHS figures show 1,645 people in Epping Forest were “pinged” by the Covid app in the week to July 21 – the latest available data.
That was an increase from the 1,353 alerts sent out the week before.
Across England and Wales, nearly 700,000 alerts were sent to Covid app users in the latest seven-day period – a record high and 11% more than the previous week.
Communities Secretary Robert Jenrick has urged people to isolate if they are advised to do so, saying there “isn’t very long to go” until August 16, when all fully vaccinated contacts in England who test negative can avoid isolation.
"But while isolation is not mandatory for people “pinged” by the Covid app in England, anyone who is contacted and told to self-isolate by the NHS Test and Trace service has a legal obligation to do so."
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