Mortality decline in the late 19th century was mainly due to the reduction of a very high infant mortality rates. But during the 20th and 21st centuries a decline in fertility rates and an improved life expectancy has changed the age structure of the population. Elwick has been described by John Marius Wilson in historic writings as, "Elwick, a township in Hart parish, Durham; 4 miles W by S of Hartlepool. It has a post office under Ferryhill. Acres, 1, 500. Real property, £1, 418. Pop., 240. Houses, 55. The township is a meet for the Durham hounds." – from the Imperial Gazetteer of England and Wales in 1870–72. The population as taken at the 2015 census was 2061. Elwick is also an
electoral ward of Hartlepool since 1974 and is run by a
parish council. In May 2021, the parish council alongside the parish councils of the villages of
Hart,
Dalton Piercy and
Greatham all issued individual votes of no confidence in
Hartlepool Borough Council, and expressed their desire to re-join
County Durham. ==Church==