Probably Clackmannanshire in Scotland. However, there are some counties that have two words in their title which might be longer.
Cornwall is a county in the UK.
Newtownmountkennedy in County Wicklow.
river severn
Ultimate
In the UK a county can also be called a Shire.
The River Severn (220 miles / 354km) in Wales, UK.
Orange County is the name of a county in California, Florida, Indiana, New York, Texas, Vermont and Virginia.
The country with the longest name is the UK, whose formal name is 'The United Kingdom of Great Britain and Northern Ireland', with forty-eight letters.
Colchester is in Essex. It is an important Garrison town. It was an important Roman town. I believe it has the longest railway platform in UK.
Probably Clackmannanshire in Scotland. However, there are some counties that have two words in their title which might be longer.
england or the uk (united kingdom)
Cornwall is the county with the longest coastline.