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Immaculate Conception Church is commonly called St. Mary. Founded in 1847 as an offshoot of Sts. Peter & Paul for Irish Catholics living in East Williamsburg. Church constructed in 1853. The parish closed in about 2014 and merged with Most Holy Trinity.

Founded in 1845, originally a parish of the Diocese of New York.

Now St. Patrick-St. Lucy parish. The parish of St. Patrick was founded in 1843, prior to the establishment of the Diocese of Brooklyn.

Established in 1842.

Most Holy Trinity parish was  founded as the German Church of the Holy Trinity in 1841. It was the first National parish in the Brooklyn diocese, and officially the first Catholic parish in Williamsburgh (Sts. Peter and Paul began services in 1840, but was not formally established until 1844). Most Holy Trinity was also the mother church for a host of other German parishes over time. Holy Trinity was founded by Father John Raffeiner, a wealthy doctor-turned-priest from Austria.

Located at Hick & Warren Streets. Our Lady of Pilar merged into St. Peter in 1934. St. Peter-Our Lady of Pilar closed in 1974 and merged with St. Paul parish on Court Street. The church, rectory and school of St. Peter's church were converted to apartments in the early 2000s.

Second parish in the Diocese of Brooklyn.

1844 is the official founding date for the Parish of Ss. Peter and Paul, although the history of the parish goes back to 1837. That is the date of the first recorded mass in Williamsburgh, which took place in a private home on Fourth Street (Bedford Avenue) between South 3^rd and South 4^th Street

Founded 1822, as the third Roman Catholic parish of the Diocese of the New York. St. James was the first Roman Catholic parish on Long Island. St. James became the cathedral parish of the Diocese of Brooklyn on its founding in 1853 (which at the time comprised all of Long Island). The existing church of St. James was constructed in 1903.

The Parish of the Annunciation of the Blessed Virgin Mary was founded in 1864, an offshoot of Most Holy Trinity Church on Montrose Avenue. The first church building for the predominantly German Annunciation congregation was probably a wooden structure located on the northwest corner of Havemeyer and North Fifth Streets, where the school is now located. Rev. John Hauptmann was the first priest of the parish. The existing church, designed by Francis J. Himpler, was constructed in 1870. 

Founded in 1806, the First Methodist Episcopal congregation was the first to be founded in what would become the Village of Williamsburgh, and the second in the Town of Bushwick. The first church for the congregation was constructed in 1808 on North 2nd Street (Metropolitan Avenue) and Fifth (Driggs) Street. The last church for this congregation (constructed in 1839) still stands on South Second Street. From about 1839 until it burned down in 1845, a Black congregation worshipped in the old church.

The parish of St. Patrick was founded in the early 1840s, prior to the establishment of the Diocese of Brooklyn. The origins of the church are a bit obscure, but it appears to have been founded as a parish for Irish Catholics in East Brooklyn (now Clinton Hill/Bedford-Stuyvesant), with the first services held in private structures near Wallabout Street and Flushing Avenue. Early secondary-source references to the church call it the Wallabout Church. In 1843, Rev. Hugh Maguire was appointed as the first priest for the parish.