Biggest Cities in the European Union by Letter - O

Name the 20 largest cities in the EU that start with O
City proper population, data from citypopulation.de
UK is included!
Quiz by Gassu
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Last updated: June 3, 2017
First submittedJune 3, 2017
Times taken114
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Rank
Population
Country
Hint
City
1
292,000
Czech Republic
Coal, Moravia
Ostrava
2
211,000
Germany
Gasometer, International Short Film Festival
Oberhausen
3
201,000
Finland
Major city in northern Finland
Oulu
4
198'000
Spain
Capital of Asturias
Oviedo
5
196,000
Romania
Episcopal Palace
Oradea
6
177,000
Denmark
Hans Christian Andersen
Odense
7
173,000
Poland
Lake Ukiel
Olsztyn
8
168,000
United Kingdom
University, English Dictionary
Oxford
9
164,000
Germany
St. Lamberti Church
Oldenburg
10
162,000
Germany
Erich Maria Remarque
Osnabrück
11
146,000
Sweden
Water park Gustavsvik
Örebro
12
124,000
Germany
Leather production, river Main
Offenbach am Main
13
119,000
Poland
One of the oldest cities, "Polish Venice"
Opole
14
115,000
France
There is a new one in Louisiana
Orléans
15
106,000
Spain
Northwestern Spain near Portugal
Ourense
16
102,000
United Kingdom
Residential town in Greater Manchester
Oldham
17
100,000
Czech Republic
Locally Holomóc or Olomóc
Olomouc
18
90,000
Netherlands
Three-letter city in North Brabant
Oss
19
84,000
Croatia
Major city in Eastern Croatia
Osijek
20
71,000
Belgium
Largest on the Belgian coast
Ostend
+1
Level 74
Jun 4, 2017
Oporto would be the biggest of all - or do you exclude that because it's known as Porto in Portugal?
+1
Level 72
Jun 4, 2017
Just do the next one in the series and you know the answer