The Japanese National Police Agency said on Monday that the March 11 earthquake and tsunami have left 13,116 people dead and 14,377 others unaccounted for in Japan by 10:00 a.m. local time (0100 GMT).
About 151,000 survivors are staying in 2,300 shelters across the country as one month has passed since the quake and tsunami.
A 9.0-magnitude earthquake hit the Pacific coastal areas of northeastern and eastern Japan on March 11, triggering enormous tsunami.
Heavy casualties and extensive damage have been caused by the twin disasters.