Immigration Enforcement Officers visited four business premises linked to a beauty salon before arresting five women.
The UK Border Agency detained the women at business addresses linked to Adorn Beauty across the Thames Valley, including in Friars Square and Hale Leys in Aylesbury on Thursday June 12.
One Nepalese woman was arrested at the Hale Leys Centre for working in breach of her visa.
Meanwhile, at Friars Square one Indian woman was also arrested for working in breach of her visa.
The staff were questioned to check if they had the right to live and work in the UK.
The other women, also of Nepalese and Indian origin, were arrested for working in breach of their visa conditions, seeking to obtain leave to remain in the UK by deception and overstaying their visa at premises in High Wycombe and Slough.
All five women were detained pending removal from the UK.
The premises were served with a civil penalty notice for employing the illegal workers.
This means the employer will be fined up to £20,000 per illegal worker unless proof is provided that the correct right to work checks were carried out.
Paul Smith, assistant director of Thames Valley and Surrey immigration enforcement said: “Illegal working is not victimless.
“It defrauds the taxpayer, undercuts honest employers and cheats legitimate job seekers out of employment opportunities.
“We would urge members of the public with information about suspected immigration abuse to get in touch.”