Sutton Council has been given a gold rating by the national Campaign to End Loneliness - putting it among the top 10 out of 152 authorities in the UK to get the top standard.
The rating is a recognition of the work the council does to reduce loneliness and isolation by visiting and checking-in with vulnerable people.
Councillor Colin Stears, chairman of the adult social services and health committee, said: "We are delighted by this national recognition.
"We’re committed to continuing our work in Sutton to prevent social isolation amongst our residents and combat loneliness.
"Our Joint Health and Wellbeing strategy describes our priorities for taking action to improve the health and happiness of our residents and ensure that people are not isolated and instead feel included within their local communities.
"We would encourage local residents to also do their part by regularly making time to catch up and check in with family members, friends and neighbours, especially if they are vulnerable or don’t get out very often.
"It’s likely to be a harsh winter so it’s even more important we keep an eye on each other."
The Campaign to End Loneliness, which has previously been backed by Sutton and Cheam MP Paul Burstow, claims isolation can be as damaging to a person's health as smoking 15 cigarettes a day
The campaign also said 800,000 people in the UK are chronically lonely.
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