Conservatives also gained Haldens, while holding on to Hatfield East and Hatfield Rural.
Cllr Stephen Boulton will continue to represent Hatfield Rural, but Hatfield East will be represented by Peter Hebden.
In Hertsmere, the Conservatives held on to just four of their seven seats - including in Potters Bar East and Potters Bar West and Shenley.
Leader of the borough council Cllr Morris Bright was among those who held on to his seat.
Overall the Conservatives have retained their control of Herts County Council - but lost their leader in an election shock, when Cllr David Williams lost his seat in Harpenden North East to Lib Dem Paul De Kort.