According to Lewis' Topography of Ireland (1837), the parish contained 1624 inhabitants, of which 1159 were in the town and it comprised 7974 statute
acres. The soil was recorded as "good" with a considerable portion of the land being "in pasture for fattening stock for the Dublin, Liverpool, and Bristol markets, and the remainder is under tillage". Lewis recorded that the living was a
rectory and
vicarage in the patronage of the Archbishop. The
tithes of the parish amounted to £600. The
glebe house was built in 1822 by a loan of £562 from the
Board of First Fruits. The building stills stands and the National Register notes that: "It is a fine and imposing house that, despite a subsequent change of ownership and use, retains most of its original form and character.". The parish's eponymous "salmon leap" was a 5-metre waterfall on the Liffey, upstream from the village. In 1945, a
hydroelectric dam was built on the site and its reservoir flooded the waterfall. The dam generates 4
Megawatts of electricity.
Ecclesiastical parishes Like all civil parishes, this civil parish is derived from, and co-extensive with a pre-existing ecclesiastical parish of the same name, as used in the
Church of Ireland. In the
Archdiocese of Dublin, the parish is today united with
Lucan in the "Leixlip Union of Parishes". St. Mary's church is located off the Main Street. The building - a listed
national monument - was constructed between 1780 and 1820. In the Catholic Church, the civil parish is divided between the
ecclesiastical parishes of Leixlip and Confey in the
Archdiocese of Dublin. The church building in Leixlip parish, "Our Lady's Nativity", is located on Pound Street, Old Hill. It was constructed between 1830 and 1840 and is named in honour of the
Nativity of Our Lady. The church building in Confey parish, "St. Charles Borromeo", is located on "Captain's Hill". The parish was constituted in 1984 from Leixlip under the care of the
Redemptorists and the church was named in honour of St.
Charles Borromeo ==Townlands==