Statistics for 25 largest cities by letter - O

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Country	Population	City	% Correct
Japan	2,592,413	Osaka	100%
Norway	580,000	Oslo	98%
Ukraine	1,001,558	Odessa	96%
Canada	812,129	Ottawa	93%
Burkina Faso	1,086,505	Ouagadougou	82%
Russia	1,129,281	Omsk	80%
Algeria	645,984	Oran	79%
United States	631,346	Oklahoma City	71%
Czechia	313,088	Ostrava	50%
United States	443,885	Omaha	45%
United States	419,267	Oakland	41%
Sudan	1,200,000	Omdurman	34%
Japan	639,652	Okayama	29%
Russia	550,204	Orenburg	29%
Nigeria	561,066	Onitsha	27%
Japan	448,907	Oita	20%
Russia	324,200	Orel	16%
Nigeria	736,072	Oyo	16%
Morocco	405,253	Oujda	11%
Japan	298,164	Otsu	9%
Japan	352,361	Okazaki	7%
Brazil	366,754	Olinda	7%
Nigeria	479,178	Okene	5%
Brazil	677,856	Osasco	5%
Iran	577,307	Orumiyeh	4%