Niihari (新治村, Niihari-mura) was a village located in Niihari District, Ibaraki Prefecture, Japan.

Map of Niihari, Ibaraki

As of May 1, 2005, the village had an estimated population of 9,404 and a population density of 293.96 persons per km2. The total area was 31.99 km2.

On February 20, 2006, Niihari was merged into the expanded city of Tsuchiura.

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