By claiming pension credit an individual can also unlock other benefits, such as winter fuel payments.
These were previously available to all pensioners but, under changes brought in by the government in July, only those who claim pension credit or other means-tested benefits will receive them.
The Department for Work and Pensions said pension credit was worth on average more than £3,900 each year.
Claiming pension credit can also unlock several other benefits including a free TV licence for people over 75, help with NHS dental treatment, hospital transport costs and council tax discounts.
Bulat, a Labour councillor, said: “I am very concerned that up to one in three people in Cambridgeshire who may be eligible for pension credit are not claiming it...
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