The best replacement for users is authenticated users.

The best alternatives to users are rated as following:
★★★★★  authenticated users
★★★★★  administrators
★★★★  everyone
★★★★  pc users
★★★  domain users
★★  customers
★★  mac users
★★  facebook users
★★  iphone users
★★  user's
★  documents and settings
★  power users
★  consumers
★  named users
★  non drug users
★  internal users
★  google users
★  android users
★  users
★  concurrent users
★  ie users
★  peopleware
★  sometimes just users
  yahoo users
  droid users
  end-users
  logins
  clients
  myspace
  facebook
  windows users
  users'
  ps3 users
  myspace users
  external users

Your alternative for users is not listed? Suggest!
Speaking about users, one probably shouldn't forget about access.

Other search terms related to users and their ratings are:
★★★★★ access
★★ one account
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Google Trends

Scale is based on the average worldwide traffic of users in all years. Click on graph for more.
users
authenticated users
administrators