It is also the administrative headquarter of Koderma district.

As per 2011 Census of India, Kodarma Nagar Parishad had a total population of 24,633 of which 12,941 were males and 11,692 females.

[1] As of 2001[update] India census,[2] Kodarma had a population of 17,160.

In Kodarma, 17% of the population is under 6 years of age.

[3] Koderma Thermal Power Station a coal-based 1000MW power plant of DVC was established in 2012 employing thousands of people.