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We report the magnetic ordering and structural distortion in PrFeAsO crystals, the basis compound for one of the oxypnictide superconductors, using high-resolution x-ray diffraction, neutron diffraction, and x-ray resonant magnetic scattering (XRMS). We find the structural tetragonal-to-orthorhombic phase transition at    T  S   =  147    K   , the AFM phase transition of the Fe moments at    T  Fe   =  72    K   , and the Pr AFM phase transition at    T  Pr   =  21    K   . Combined high-resolution neutron diffraction and XRMS show unambiguously that the Pr moments point parallel to the longer orthorhombic  a  axis and order antiferromagnetically along the  a  axis but ferromagnetically along the  b  and  c  directions in the stripelike AFM order. The temperature-dependent magnetic order parameter of the Pr moments shows no evidence for a reorientation of moments.