There are no Monumental Inscriptions for Sapley, per se . Any related to Sapley residents are likely to be recorded under the Hartford parish page.
Census information for Sapley can normally be found under Hartford parish.
A full transcription of the 1891 Census of the Huntingdon Registration District (RG12/1237) in which Sapley was enumerated, and which took place on 5th April 1891, is available as fiche C9 from the Huntingdonshire FHS.
In 1831 the recorded population of Sapley was 8; in 1851 this had grown to 17. Population records between 1877 and 1935 were included in Hartford. Since 1935 both Hartford and Sapley have been part of the Borough of Huntingdon, and the population statistics treated accordingly.