The Home Office stats include 56 arrests related to the fatal attacks on Westminster, Manchester Arena and London Bridge.
Of those arrested 54 were women and 17 were under 18, according to the Home Office figures.
It also includes the one arrest made after the vehicle attack made near Finsbury Park Mosque in late June.
British police made a record 379 arrests for terrorism-related offences previous year, official figures show.
Sky News home affairs correspondent Mark White said that, as a rule, while many people are initially arrested after a terrorist attack - including family members of the suspects - they may be released after questioning and investigations.
Prisons saw the number of terrorist inmates rise by 35 per cent this year to 204, continuing an upward trend since statistics were first collected in 2001.
The United Kingdom has suffered a series of terror attacks this year.
Domestic terrorism refers to activity where there are no links to either Northern Ireland-related or global terrorism.
Security Minister Ben Wallace said: "The figures released today show the tireless efforts of the police, Security Service and Crown Prosecution Service during what was an unprecedented period of terrorist activity in the UK".
The senior officer said the figures should reassure the public that police and MI5 are working "night and day" to disrupt and arrest people "who are determined to hurt us".
The new figures show a 60% jump in arrests linked to global terrorism, from 184 to 294.
Of those arrested, 50% were eventually released without charge, while 105 people were charged with terror-related offences. He explained: "That's why we're looking at such a high number, but they are still pretty significant".
"Everyone has a role to play in identifying and stopping the threat terrorists pose to the UK".