UKIP failed to field candidates in several Hertfordshire constituencies, and after its leader Paul Nuttall resigned after a "woeful showing" overall, he said: "A new era must begin with a new leader."
Stevenage was a close-run contest with Conservative Stephen McPartland retaining the seat with 50.3% of the vote including a 5.7% increase in support.
In second place was Labour's Sharon Taylor with 43.4% of the vote, boosted by a 9.2% increase.
Conservative Mark Prisk held on to Hertford and Stortford, boosting his party's support by 4.2% to take 60.3% of the vote share, leaving Labour trailing on 28.6% despite a 10.7% boost in its support.
In Broxbourne Conservative Charles Walker took 62.2% of the vote with Labour's Selina Norgrove on 28.9% after a 10.75% boost to her share, while UKIP slumped by 15.7% to leave it with only 4%, slightly ahead of the Lib Dems on 3.1%.
In St Albans Conservative Anne Main held on to the seat with 43.1% of the vote from the Lib Dems' Daisy Cooper on 32.4%.