Dr. Comerford, in his Collections on the Diocese of Kildare and Leighlin, states: "The present parish of Kilcock comprises the ancient ecclesiastical divisions of Kilcock, Cloncurry, Sculloguestown, and Clonshambo."
He continues: "Kilcock derives its name from St. Coca, virgin, whose chief feast was celebrated on teh 6th of June. We find her name calendared in the Martyrology of Donegal also, at the 8th January: 'Cuach, virgin, of Cil-Cuaigh in Cairbre na Ciardha;' and again, in the same, under date April 29th: 'Coningen, i. Cuach i. Ci Finn Maighi.' A gloss on this passage states that the maiden Coniengean, or Cuach, was the pupil or Daltha of Mac Tail, Bishop of Kilcullen. She is stated to have been the sister of St. Kevin of Glendalough, of St. Attracta, and other saints. (See Loca Patr., p. 150. nota) Colgan, it should be added, considers that this was a different person from the Patron Saint of Kilcock. In the Life of St. Ciaran of Saighir, it is stated that "he used to go to the sea rock that was far distant in the sea (where his nurse, i.e. Coca, was), without ship or boat, and used to return atain.' St. Coca was identified with this locality from a very early date. The Annals of Ireland record, in A.D. 774, the Battle of Cill Coice, in which Fearghal, son of Donghal, son of Faelchu, lord of Forthatha-Laighean, was slain by the King Donnchadh. the Holy Well of the Saint, called Tubbermohocca, stood in what is now an enclosed yard in the town. About forty years ago, it was shut up by the occupant of the premises, and the stream diverted to what was considered a more convenient situation."
Dr. Comerford continues: "The present very fine parochial Church was commenced in 1862, by the late Rev. William Treacy, P.P., who had expended £1,000 on the work, when he was called to his reward. He left, partly of his own means, and partly the result of subscriptions, received, £3,000 towards its completion, to effect which cost some £6,000 more. It is in the early gothic style, from a design by MacCarthy, and consists of chancel, nave, and aisles, with a massive tower 108 feet in height; including the tower, which is at the west end, the church is 131 feet in length, and is 60 feet in width. It was dedicated to the service of God, under the invocation of St. Coca, in 1867. Over the grave of the founder, within the church, a monumental brass bears the following inscription: 'Sacred to the revered memory of Rev. William Treacy, who had been 34 years P.P. of Kilcock; the founder of this church, - who departed this life on the 25th May, 1862, in the 59th year of his age. This monument was erected by his affectionate brother, Rev. Felix Treacy, P.P., Balyna.' The beautiful and costly High Altar, and a fine stained-glass window over it, are also memorials of Fr. Treacy, erected by the parishioners. In the porch, let into the wall, is a marble monument, removed from the old church, having the following epitaph: 'To the memory of the Very Rev. Dr. Murphy, P.P. of the united parishes of Kilcock and Cloncurry, and V.G. of the Diocese of Kildare, who departed this life July 9th, 1816, in the 52nd year of his age. This monument is erected by the Protestant and Roman Catholic Inhabitants of said parishes, to testify their high esteem for his most amiable and exemplary character. Munus parvum quidem, sed magnam testatur amorem. A.D. 1817.' Another monument, formerly inserted in the wall of the old church, but now in the grounds near the present vestry, has the following: 'here lieth the body of the Rev. Dr. Dunne, P.P., of Kilcock, and V.G. of the Diocese of Kildare. He departed this life the 6th of March, 1796. His ardent zeal, and unwearied attention to his flock, will live for ever in the grateful minds of all his parishioners. May he rest in peace. Amen. Hodie mihi; cras tibi.' And on the same slab: 'Also the body of the Rev. James Dempsey, P.P., Kilcock. He died, Feb. 28th 1801.'
Dr. Comerford concludes: "In 1872, the fine schools of the Christian Brothers, dedicated to St. Joseph, were erected at a cost of £1,800. the commodious residence of the Brothers is situate on the opposite side of the street"
"The Presentation Convent, dedicated to the most Sacred Heart of Jesus and the Immaculate Heart of Mary, has been built as a novitiate for the Foreign Missions, to which the Sisters are sent after Profession. This Convent was established in 1879, by the late Mother M. Teresa Comerford, who, with three other sisters, came from San Francisco for that purpose."
"St. Coca is the patron of the parish of Kilcock; but the former parish church was dedicated to our Blessed Lady Assumed into Heaven. This appears from the Parish Register, in which the parish is styled Parochia Stae. Cogae; and the church, Ecclesia Assumptae Virginis de Kilcock. According to local tradition, a religious house formerly stood on the spot lately occupied by the Kilcock National School.
At 11 o'clock this morning, a Requiem Mass in the Gregorian Rite was celebrated in St. Coca's Church, Kilcock, for the repose of the souls of the deceased members of St. Conleth's Catholic Heritage Association. A sizable number of local people joined members from across the Diocese of Kildare and Leighlin and outside the Diocese for the Mass. With only one omission, the Common and Proper of the Mass was chanted.