Nearly a third of people in South Holland were single as the number of marriage and civil partnerships dropped in the past decade, new census figures show.
The area follows trends across England and Wales, where the rate of single people has increased since the last census in 2011.
The number of people considered single – never having been in a civil partnership or marriage – in South Holland when the census took place last year was 23,857, up from 18650 in 2011.
Of those aged 16 and older in South Holland, 30.2% were single – an increase on 25.4% in 2011.
The picture was similar across England and Wales last year, where 37.9% of people 16 and older were single, up from 34.6% in 2011.
And 49.2% of people in South Holland were married or in a civil partnership last year – down from 53.5% 10 years prior.
Data from the census shows 38,558 people were in opposite sex marriages last year, down from 39,098 in 2011.
An additional 149 were in same sex marriages in South Holland last year – they were illegal in 2011.
The figures also show 89 people were in same sex civil partnerships last year and 58 were in opposite sex civil partnerships. There were 122 people in civil partnerships 10 years prior, which were only allowed for same sex couples at the time.
There were 8,345 divorced people and 13 people with a dissolved civil partnership in South Holland last year, making up 10.6% of people aged 16 and over.
John Wroth-Smith, Census deputy director, said: "When looking a bit deeper, we can see that the proportion of people in a marriage or civil partnership has declined, which follows the long-term trend of declining marriages."
"Conversely, the number of people who were never married or in a civil partnership has increased by almost 3 million," Mr Wroth-Smith added.
Nationally, 21.7 million people were married or in a civil partnership – making up 45% of those aged 16 and older. And 9.1% of the population were divorced or no longer in a civil partnership, up slightly from 9% a decade prior.