Total casualties - defined as the number of civilians killed or wounded - increased one per cent between January and June compared to the same period last year, with 1,592 civilians killed and 3,329 injured, the United Nation's Mission's for Afghanistan (UNAMA) said in a report.
The figures marked a six per cent fall in civilian deaths but a four per cent increase in injuries.
Ground combat is causing more deaths and injuries than improvised explosive devices (IEDs) in a worrying sign of spreading conflict, the report said, adding that the conflict was taking a particularly heavy toll on women and children.
"The statistics in this report do not reveal the grieving families and the loss of shocked communities of ordinary Afghans. These are the real consequences of the conflict in Afghanistan."
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The figures highlight growing insecurity as the Taliban insurgency spreads north from its traditional southern and eastern strongholds, with Afghan forces facing their first summer fighting season without full NATO support.
UNAMA attributed 70 per cent of civilian casualties to "anti-government elements" including the Taliban.
US-led NATO forces ended their combat mission in Afghanistan in December, leaving local forces to battle militants alone, but a 13,000-strong residual force remains for training and counter-terrorism operations.