The following quotation comes from the Imperial Gazetteer of Scotland, edited by John Marius Wilson and published in 1868. This reference was found in volume II, page 171:
"The present parish comprehends the ancient parishes of Kelso or St Mary's, Maxwell, and St James. The first of these lay on the north side of the Tweed, and was within the diocese of St Andrews; and the second and third lay on the south side, and were within that of Glasgow, - the river being here the boundary."
Rutherfurd's Southern Counties Register and Directory of 1866 lists the following non-conformist churches:
- North Free Church
- Free East Church (Sprouston)
- United Presbyterian Church (1st)
- United Presbyterian Church (East)
- Reformed Presbyterian Church
- Congregational Church
- St Andrews Episcopal Church
- Roman Catholic Chapel
Pigot and Co's Commercial Directory of Scotland published in 1837 lists the following non-conformist churches in Kelso:
- Episcopalian, at Abbey court
- United Secession, at Back way
- Original Seceders, at Back way
- Reformed Presbyterian, at Back way
- Relief, at Horsemarket
There may have been other non-conformist churches at different times.
According to Rev. William Ewing's Annals of the Free Church of Scotland (published 1914 in Edinburgh) the minister of the North Church in Kelso, Dr Horatius Bonar, left the Church of Scotland in 1843 along with his congregation. The congregation retained their church until 1864 when the Church of Scotland claimed it. Then a new church was built and opened in 1867. The 1848 membership of this congregation was 360; in 1900 it was 281.
Also breaking away in 1843, per Rev. William Ewing, was the minister of nearby Sprouston and some of his congregation. They worshipped in the old Original Secession Church in Kelso until their new church was opened in 1846 in the outskirts of the town. In 1883 this Free Church congregation was renamed from Sprouston to Kelso East. This congregation's membership in 1848 was 414; by 1900 it was 221.