St Johns is a locality southeast of Kapunda. The foundation stone for the St John Evangelist Church was laid in 1850, however the building was not complete until 1854.
A school was opened in 1859, run by the Sisters of St Joseph of the Sacred Heart after 1868. In 1897 the school became a reformatory for girls until it closed in 1909.
"A Rustic Chapel and Cemetery" is in The Irish Harp, 15 May 1874, page 3a. A school picnic is reported on 16 October 1874, page 3c.
About three miles south-east from Kapunda... stands the substantial and picturesque little chapel of St John's. As evidence of the former importance of this locality, and as a monument of the enterprise of the first Catholic priests and clergy of this colony, the subject of this sketch will not fail, I trust, to interest readers... Thirty years ago it was considered St John's would be the most central position in which to erect an edifice ... Owing, however, to mineral discoveries, the extension of agricultural interest, together with it being made the terminus of a line of railway, Kapunda succeeded in monopolising the commercial position it was thought Saint Johns would ultimately have attained...