Code	Name	Region
JPOTS	Otsuki	19
JPOUE	Oume	13
JPOOA	Oura, Saga	41
JPOUA	Oura/ariake	43
JPOUR	Oura/kamitsushima	42
JPOOR	Oura/kasaoka	33
JPORX	Oura/marugame	37
JPORR	Oura/uchinoura	46
JPOWR	Owariasahi	23
JPORM	Ora	10
JPORG	Origami	42
JPORN	Orino	36
JPOSA	Osaka	27
JPOUK	Osaka, Tottori	31
JPOSQ	Osaka-fu	27
JPOKQ	Osakasayama, Osaka	27
JPOSX	Osaki, Kagoshima	46
JPOSK	Osaki, Miyagi	4
JPOSN	Osaki/mitsushima	42
JPOJO	Osako	34
JPOTO	Osato	46
JPOST	Osetoyanagi	42
JPOSD	Oshidomari	1
JPOSM	Oshima, Nagasaki	42
JPOSL	Oshima, Yamaguchi	35
JPOCN	Oshino	19
JPOSE	Osoe	32
JPOSU	Osuki	46
JPOTG	Ota, Gunma	10
JPOUM	Omu	1
JPOMJ	Omura	42
JPOMU	Omuta	40
JPONG	Onagawa	4
JPONA	Onahama	7
JPOGC	Ongachi	46
JPONJ	Oniike	43
JPONK	Oniki	43
JPONI	Onishi	38
JPONW	Oniwaki	1
JPONB	Onnebetsu	1
JPONN	Ono	18
JPONZ	Ono	28
JPOAD	Onoaida	46
JPOND	Onoda	35
JPNOJ	Onojo	40
JPONO	Onomichi	34
JPONX	Onomichiitozaki	34
JPONU	Onuki	4
JPOPA	Oppama	14
JPOKB	Okubo, Tokyo	13