In 2011, GDP per capita1, expressed in terms of purchasing power standards, in the EU28's 272 NUTS-2 regions ranged from 29% of the EU28 average in the regions of Severozapaden in Bulgaria and Nord-Est in Romania, to 321% of the average in Inner London in the United Kingdom.
This information is taken from data released by Eurostat, the statistical office of the European Union.

41 regions with GDP per capita above 125% of the EU average…
The leading regions in the ranking of regional GDP per capita in 2011, after Inner London in the United Kingdom
(321% of the average), were the Grand Duchy of Luxembourg (266%), Bruxelles/Brussel in Belgium (222%), Hamburg in Germany (202%), Bratislava in Slovakia (186%), Île de France in France and Groningen in the Netherlands (both 182%), Stockholm in Sweden (173%), and Praha in the Czech Republic (171%).
Among the 41 regions exceeding the 125% level, eleven were in Germany, five each in the Netherlands and Austria, three each in Belgium, Italy and the United Kingdom, two each in Spain and Finland, one each in the Czech Republic, Denmark, Ireland, France, Slovakia and Sweden, as well as in the single region Grand Duchyof Luxembourg.
It should be noted, however, that in some regions the GDP per capita figures can be significantly influenced by commuter flows. Net commuter inflows in these regions push up production to a level that could not be achieved by the resident active population on its own. There is a corresponding effect in regions with commuter outflows.

…and 75 regions below 75%

The eight lowest regions in the ranking were all in Bulgaria and Romania, with the lowest figures recorded in Severozapaden in Bulgaria and Nord-Est in Romania (both 29% of the average), followed by Severen tsentralen in Bulgaria (31%) and Yuzhen tsentralen in Bulgaria (32%). Among the 75 regions below the 75% level, fifteen were in Poland, nine in Greece, seven each in the Czech Republic and Romania, six in Hungary, five each in Bulgaria and Italy, four each in Portugal and the United Kingdom, three in Slovakia, two each in Spain, France (both overseas departments) and Croatia, one in Slovenia, as well as in the single region Member States of Estonia, Latvia and Lithuania.

 Source  -  Eurostat:
www.euractiv.pl/politykaregionalna/artykul/podzielona-europa-biedna-polska-005540