Shires of UK

Shires of UK

One presumes you mean 'at the present time'. Shires are counties, and counties are political divisions subject to change. Many of the old counties no longer have a physical existence, though their inhabitants will still insist they live there. There are people in Dumfries and Galloway, for example, who still insist that they live in Dumfriesshire.
 
However, the official list since 1998 has been as follows:

Aberdeenshire (Abers)
Bedfordshire (Bed)
Berkshire (Berks)
Buckinghamshire (Buk)
Cambridgeshire (Cambs)
Carmarthenshire (Carmar)
Cheshire (Ches)
Clackmannanshire (Cla)
Denbighshire (De)
* Derbyshire (Derby)
East Ayrshire (E Ayr)
East Dunbartonshire (E Dun)
East Renfrewshire (E Rn)
East Riding of Yorkshire (East Yorks)
Flintshire (F)
Gloucestershire (Glos)
Hampshire (Hants)
Herefordshire (Heref)
Hertfordshire (Hert)
Lancashire (Lancs)
Leicestershire (Leics)
Lincolnshire (Lincs)
Monmouthshire (Mon)
North Ayrshire (N Ayr)
North Lanarkshire (N Lnk)
North Yorkshire
Northamptonshire (NHant)
Nottinghamshire (Not)
Oxfordshire (Oxfd)
Pembrokeshire (Pem)
Renfrewshire (Ren) 
Shropshire (Shrop)
South Ayrshire (S Ayr)
South Lanarkshire (South Lnk)
South Yorkshire (South Yrks)
Staffordshire (Staff)
Warwickshire (War)
West Dunbartonshire (W Dun)