Sheffield, England.

Sheffield is the fourth largest urban local authority, but it most definitely isn't the fourth largest city.

8.2 million - Greater London Urban Area (London)
2.2 million - West Midlands Urban Area (Birmingham)
2.2 million - Greater Manchester Urban Area (Manchester)
1.4 million - West Yorkshire Urban Area (Leeds)
0.8 million - Tyneside Urban Area (Newcastle-Gateshead)
0.8 million - Liverpool Urban Area (Liverpool)
0.6 million - Nottingham Urban Area (Nottingham)
0.6 million - Sheffield Urban Area (Sheffield)
0.5 million - Bristol Urban Area (Bristol)
0.4 million - Brighton/Worthing/Littlehampton (Brighton & Hove)

EarlyBird said:

Sheffield is the fourth largest urban local authority, but it most definitely isn't the fourth largest city.

8.2 million - Greater London Urban Area (London)
2.2 million - West Midlands Urban Area (Birmingham)
2.2 million - Greater Manchester Urban Area (Manchester)
1.4 million - West Yorkshire Urban Area (Leeds)
0.8 million - Tyneside Urban Area (Newcastle-Gateshead)
0.8 million - Liverpool Urban Area (Liverpool)
0.6 million - Nottingham Urban Area (Nottingham)
0.6 million - Sheffield Urban Area (Sheffield)
0.5 million - Bristol Urban Area (Bristol)
0.4 million - Brighton/Worthing/Littlehampton (Brighton & Hove)

Click to expand...

And if you want to be picky, I might aswell add this ...

Greater London Urban Area - 7,651,634 (London)
West Midlands Urban Area- 2,296,180 (Birmingham)
Greater Manchester Urban Area - 2,277,330 (Manchester)
West Yorkshire Urban Area - 1,445,981 (Leeds)
Birmingham Urban sub-division - 965,928 (Birmingham)
Tyneside Urban Area - 885,981 (Newcastle)
Liverpool Urban Area - 837,998 (Liverpool)
Sheffield Urban Area - 633,362 (Sheffield)
Nottingham Urban Area - 613,726 (Nottingham)
Bristol Urban Area - 522,784 (Bristol)

Citrus-Fruit said:

And if you want to be picky, I might aswell add this ...

Greater London Urban Area - 7,651,634 (London)
West Midlands Urban Area- 2,296,180 (Birmingham)
Greater Manchester Urban Area - 2,277,330 (Manchester)
West Yorkshire Urban Area - 1,445,981 (Leeds)
Birmingham Urban sub-division - 965,928 (Birmingham)
Tyneside Urban Area - 885,981 (Newcastle)
Liverpool Urban Area - 837,998 (Liverpool)
Sheffield Urban Area - 633,362 (Sheffield)
Nottingham Urban Area - 613,726 (Nottingham)
Bristol Urban Area - 522,784 (Bristol)

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That's innaccurate as it doesn't take into account the 30,000 shortfall in the census population for the "Manchester" local authority. It was raised from 392,000 to 422,000. Also, per ONS data Nottingham Urban Area is larger than Sheffield Urban Area. So, if you want to play those kind of games then it's:

Greater London Urban Area - 7.6 million (London)
Greater Manchester Urban Area - 2.3 million (Manchester)
West Midlands Urban Area- 2.2 million (Birmingham)
West Yorkshire Urban Area - 1.4 million (Leeds)
Tyneside Urban Area - 0.8 million (Newcastle-Gateshead)
Liverpool Urban Area - 0.8 million (Liverpool)
Nottingham Urban Area - 0.6 million (Nottingham)
Sheffield Urban Area - 0.6 million (Sheffield)
Bristol Urban Area - 0.5 million (Bristol)

The reason I gave the populations I did was because I used census figures and rounded them. Manchester and Birmingham's population difference is smaller than the census margin of error. You truly are a pathetic individual.

Per ONS the census 2001 figures were:

1 8,278,251 Greater London Urban Area
2 2,284,093 West Midlands Urban Area
3 2,244,931 Greater Manchester Urban Area
4 1,499,465 West Yorkshire Urban Area
5 879,996 Tyneside Urban Area
6 816,216 Liverpool Urban Area
7 666,358 Nottingham Urban Area
8 640,720 Sheffield Urban Area
9 551,066 Bristol Urban Area
10 461,181 Brighton/Worthing/Littlehampton

Which doesn't take into account the 30,000 discrepancy in Manchester's figure, which wasn't updated until 2002. So, adding the 30,000 gives a population difference in the census of around 10,000 people. That's 0.5% and a lot less than the 3-5% margin of error.