Please Note: I have made a more recent map of London football clubs, at the following link (December 2015), Football Clubs of London (all Greater London-based association football clubs in the top 5 divisions of football in England – 16 clubs): location-map with current domestic leagues home average attendances.
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Once you click to get on to the main map page, the map of Greater London is viewable in full screen when you click near the center of the map…right on the rectangular Millwall crest. Besides showing the ceremonial counties which ring Greater London, I added surrounding towns. I did this with Google Earth, and then I checked town populations; sorry if I missed any significant towns. I added a few details in central London…Hyde Park, Regents Park, Parliament, and the boundaries of The City of London.
The crests of all the clubs on the map itself are all the same size, while the crests next to each club’s profile are sized to reflect domestic league average attendance from 7 December, 2009. The 15 clubs’ average attendances are listed at the far left.
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The following link has the list of all London football clubs in the top 8 Levels, including the 15 clubs on the map, plus the 3 London-based clubs in the Conference-South (6th Level), and the 23 London-based clubs in the Isthmian Leagues (7th and 8th Levels) [aka Ryman Leagues]…{click here (Football Clubs in London page at Wikipedia)}.
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Here is a nice site called Football In London. It’s by a German fan, but it’s in English. It has lots of info on all the Premier League clubs and Football League clubs from London [for 2010-11, it is again 13 clubs from London that are in the top 4 Levels], including plenty of photos of each club’s ground… fussballinlondon.de
Thanks to ITV for gate figures and percent capacity figures {click here}. Thanks to the contributors to the pages at en.wikipedia.org {click here (set at Hayes & Yeading page)}.