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The crystal structure of K(2)Zn(PO(3))(4) was determined and refined using the Rietveld method based on the isostructure model of K(2)Cu(PO(3))(4). This compound belongs to the monoclinic system with space group Cc and lattice parameters of a=11.0941(2) angstrom, b=12.5215(3) angstrom, c=7.6597(2) angstrom, and, beta=102.47(2)degrees. The chemical formula unit per unit cell is Z=4 and the calculated density is 2.938(3) g/cm(3). Zigzag [PO(3)](infinity) chains formed along the a axis, and their period contains eight PO(4) tetrahedrons. (C) 2009 International Centre for Diffraction Data. [DOI: 10.1154/1.3076081]