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Hyperfine fields and electronic structures were calculated by the KKR method to investigate the effects of the X atom on the magnetic properties of Co2MnX. The obtained magnetic moments of Co or Mn sites in Co2MnX are in good agreement with the experimental ones. Though the obtained hyperfine fields on Co or Mn sites are smaller in absolute value than the experimental ones, their trend is consistent with the experimental one. The hyperfine field on Mn sites is essentially determined by the magnetic moments on Mn sites themselves, but not that on Co sites. The relationship between the Co hyperfine field and the valence electron number of X atoms is discussed in terms of the obtained density-of-state.