Kirkby is a town in the Metropolitan Borough of Knowsley, Merseyside, England. The town, historically in Lancashire, has a size of 4,070 acres (16.5 km2) is 5 miles (8 km) north of Huyton and 6 miles (10 km) north-east of Liverpool. The population in 2016 was 41,495 making it the largest in Knowsley and the 9th biggest settlement in Merseyside.