Simri is a rural block, with no urban centres. Between 2001 and 2011, it experienced the lowest rate of population growth among blocks in Buxar district. As of 2011, the block sex ratio was 909, lower than the district ratio of 922. The sex ratio among the 0-6 age group was higher, at 921, although still somewhat lower than the district ratio of 934. Members of scheduled castes made up 10.86% of block residents, and members of scheduled tribes made up 2.83 (the latter being the highest among blocks in Buxar district). The block's literacy rate was 68.3% (79.53% of men and 55.89% of women), which was slightly lower than the district value of 70.14%.
