Thrapston was a rural district in England from 1894 to 1935. It was one of only a few rural districts to be split between administrative counties, with part in Northamptonshire and part in Huntingdonshire.
The Huntingdonshire parishes were:
The district was abolished in 1935 with the Northamptonshire parts going to form part of the Oundle and Thrapston Rural District (and the parish of Stanwick joining Raunds urban district), whilst the Huntingdonshire part went mainly to Huntingdon Rural District, with the parish of Covington going to St Neots Rural District.
References
Thrapston Rural District Wikipedia(Text) CC BY-SA