The total area of the district was 1,209.59 km²[citation needed] before the former constituent towns of Nishinasuno, and Shiobara were consolidated with Kuroiso to form the new city of Nasushiobara on January 1, 2005.[4] In 2003, the district had an estimated population of 154,881 and a density of 128.04 persons per km².[citation needed]