This plaintiff's affidavit for service by publication or posting may be used in Illinois when by plaintiff in an eviction action must serve the defendant by publication or posting. This template includes practical guidance and drafting notes. For a full listing of key content covering residential leasing agreements, see Residential Leasing Resource Kit. This template may be used in a residential or commercial eviction case. See 735 ILCS 5/9-107. In Illinois, a plaintiff may only serve the defendants(s) in an eviction action by publication or posting if the following criteria are met: 1. At least one prior summons was issued and returned without service being made -- and -- 2. One of the following is true: a. The defendant or unknown occupant is not a resident of Illinois. b. The defendant or unknown occupant has departed from Illinois. c. The defendant or unknown occupant is concealed within Illinois. – or-- d. The defendant or unknown occupant cannot be found after due inquiry. For guidance on commercial and residential evictions in Illinois, see Commercial and Residential Eviction (IL). For related templates see Eviction Complaint (IL), Eviction Summons (IL), and Notice of Hearing (Service by Publication or Posting) (Eviction) (IL).