[en] We demonstrate dipolar correlation in the orientation of magnetization in square arrays of MnAs nanodisks fabricated from epitaxial layers on GaAs(001). The MnAs(1100) layers possess strong in-plane uniaxial magnetocrystalline anisotropy, which enables us to discard microvortex-type ordering from degeneracy while maintaining the disks as circularly shaped with a small diameter. The autocorrelation function reveals antiferromagnetic collinear arrangements of the magnetic moments in the arrays both in the single-domain and flux-closure-state regimes of the disks. The interaction range is deduced to be nearly identical to the period of the arrays