Count Group Members

Import-Module ActiveDirectory

$groupNames = @("Group1", "Group2", "Group3")

foreach ($groupName in $groupNames) {

    $group = Get-ADGroup -Filter {Name -eq $groupName}

    $memberCount = Get-ADGroupMember -Identity $group | Measure-Object | Select-Object -ExpandProperty Count

    Write-Output "Group: $groupName, Member Count: $memberCount"

}

________________________________________________________

(Get-ADGroup -Group1 -Properties Member | Select-Object -ExpandProperty Member).count