The police force with the highest gender pay gap in England and Wales pays its female staff more than a quarter less than men, figures show.
Derbyshire Constabulary has a median gender pay gap of 28.8%. When comparing hourly rates, women earn 71p for every £1 men earn.
Forces in Kent (27.5%), Durham (27.0%) and Dorset (27.0%) follow in the list of those with the biggest gaps.
No police force has a gender pay gap in favour of women, and only Cleveland Police has no gap at all.
The Metropolitan Police is among the forces with the lowest gender pay gap, paying women 12.5% less than men on average.
Every police force in England and Wales has submitted its figures to the Government Equalities Office, something all companies and public bodies with 250 employees or more must do.
The gender pay gap is calculated as the difference between the average salaries of men and women - it is not the same as equal pay, where firms are required to pay people doing the same job the same salary regardless of gender.
The national median gender pay gap is 18.4% - 23 police forces have a pay gap at or below the national average, while 21 are higher.
From highest to lowest, here is the list of all police forces in England and Wales and their median gender pay gaps.
Derbyshire Constabulary - 28.8%
Kent Police - 27.5%
Dorset Police- 27.0%
Durham Constabulary - 27.0%
Cheshire Constabulary - 26.2%
Lancashire Constabulary - 24.7%
Leicestershire Police - 24.5%
Warwickshire Police - 22.0%
Humberside Police - 21.8%
South Yorkshire Police - 21.7%
West Mercia Police Authority - 21.7%
North Yorkshire Police - 20.8%
Essex Police - 20.7%
West Yorkshire Police - 20.7%
Avon & Somerset Constabulary - 20.4%
Suffolk Constabulary - 20.3%
South Wales Police - 20.2%
Northamptonshire Police - 19.5%
Thames Valley Police - 19.2%
Cumbria Constabulary - 19.1%
Hampshire Constabulary - 18.7%
Hertfordshire Constabulary - 18.4%
Staffordshire Police Headquarters - 17.9%
Wiltshire Constabulary - 17.6%
Gwent Police - 17.3%
North Wales Police - 17.3%
Merseyside Police - 16.4%
Northumbria Police - 15.0%
Sussex Police - 15.0%
Bedfordshire Police - 14.6%
Norfolk Constabulary - 14.5%
Greater Manchester Police - 14.1%
Cambridgeshire Police - 13.1%
Metropolitan Police Service - 12.5%
Surrey Police - 12.2%
Nottinghamshire Police - 11.6%
British Transport Police - 10.0%
Gloucestershire Constabulary - 9.1%
Dyfed Powys Police - 8.0%
West Midlands Police - 8.0%
Lincolnshire Police - 7.6%
Devon & Cornwall Police - 5.3%
City of London Police - 0.3%
Cleveland Police - 0.0%