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Affidavit for Service by Publication/Posting (Circuit Court of Cook County, Illinois) (CCG 0013 A/B), page 1
Basic · 38/100Form Complexity Index

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What this form asks for

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The Affidavit for Service by Publication/Posting is a sworn court form filed in the Circuit Court of Cook County, Illinois to support serving a defendant through publication or posting instead of personal service. It requires the affiant to state why the defendant cannot be served (e.g., out of state, cannot be found after diligent inquiry, or concealed) and to provide the defendant’s residence information or explain that it cannot be ascertained. The affidavit is made under penalty of law pursuant to 735 ILCS 5/1-109 and is used to satisfy statutory requirements for constructive service under 735 ILCS 5/2-206 and 735 ILCS 5/9-107. Completing it accurately is important because improper service can delay the case or result in service being challenged.
Fillable fields30
Pages2
Sections7
Form Complexity IndexBasic, 38/100

The AI checks your answers before you download

15 checks built for this form, so a wrong date or a missing answer is caught before anyone else sees it.

Validates Case Number is present and matches Cook County case number format

Checks that the "Case No." field is not blank and conforms to the expected local case numbering pattern (e.g., year + case type + sequence, as configured for Cook County). This is critical to ensure the affidavit is filed into the correct court case and can be docketed and retrieved. If the case number is missing or malformed, the submission should be rejected or routed to manual review because it may be misfiled or unusable.

Ensures Plaintiff and Defendant caption fields are completed (party names not blank)

Validates that the case caption includes the parties (the line above/beside “v.” and the defendant name line) and that the defendant name is not empty. Party identification is essential for legal sufficiency and for matching the affidavit to the correct litigants. If either party name is missing, the form should fail validation because the affidavit cannot be reliably associated with a specific case and defendant.

Validates Defendant name is a full legal name (not placeholder text or initials-only)

Checks that the defendant field contains a plausible full name (e.g., at least two alphabetic tokens) and is not a placeholder (e.g., “unknown,” “N/A,” or a blank line). Service by publication/posting requires clear identification of the person to be served. If the name appears incomplete or generic, the submission should be flagged for correction or manual review to prevent defective service.

Requires at least one statutory basis checkbox/statement for constructive service to be selected

Validates that at least one of the listed grounds is affirmatively selected/indicated: resides outside the state, has gone out of the state, cannot be found after diligent inquiry, or is concealed within the state. The affidavit must state a legally recognized reason why personal service cannot be made. If none are selected, the affidavit is legally insufficient and should be rejected.

Prevents contradictory service-basis selections without explanation

Checks for logically conflicting combinations (e.g., selecting both “resides outside the state” and “is concealed within the state”) unless an additional explanation field is provided in the system. Contradictions can undermine credibility and may cause the court to deny the request for constructive service. If contradictions are detected, the system should require clarification or route to manual review.

Validates Defendant residence section completeness when residence is known

If the form indicates the defendant’s place of residence is known (i.e., the “Cannot be ascertained after diligent inquiry” option is not selected), the system must require Address, City, State, and Zip to be completed. This ensures the affidavit contains the best available location information and supports required mailing steps. If any required subfield is missing, validation should fail and prompt the filer to complete the address.

And 9 more checks
  • Validates last known residence section completeness when current residence cannot be ascertained
  • Validates State field uses a valid two-letter US state/territory code
  • Validates ZIP code format (5-digit or ZIP+4) for all address blocks
  • Validates address fields are not empty/placeholder and meet minimum content rules
  • Ensures Affiant identification and signature/attestation are present
  • Validates attorney registration number (Atty. No.) format and presence when attorney fields are used
  • Ensures attorney name and role fields are complete and consistent
  • Validates attorney telephone number format and minimum digits
  • Validates primary email address format and deliverability constraints

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How to Fill Out CCG 0013 Online for Free in 2026

What the AI walks you through.

  1. Enter the court caption information at the top (Circuit Court of Cook County, Illinois), including the plaintiff and defendant names and the case number.
  2. Select the type of constructive service requested (publication and/or posting) consistent with the case and the applicable statute cited on the form.
  3. Identify the defendant and check/complete the statements explaining why personal service cannot be made (resides outside Illinois, has gone out of state, cannot be found after diligent inquiry, or is concealed within the state).
  4. Provide the defendant’s current place of residence (address, city, state, zip) if known; if unknown, indicate it cannot be ascertained after diligent inquiry and provide the last known residence details.
  5. Complete the affiant section and review the certification language confirming the statements are true and correct under 735 ILCS 5/1-109.
  6. Fill in attorney information on page 2 (attorney number, name, party represented, address, phone, and primary email) or the filer’s contact details if applicable.
  7. Sign the affidavit under oath (as required for an affidavit), then save/print and file it with the Clerk of the Circuit Court of Cook County as part of the request for service by publication/posting.

Common Mistakes in Completing CCG 0013

The ones the AI is built to catch.

Leaving the case caption and case number blank or inconsistent
People often focus on the affidavit statements and forget the top caption (party names) and the Case No. field, or they copy a case number from another matter. A missing or mismatched caption/case number can cause the clerk or judge to reject the filing or delay issuance/approval of publication/posting. Always copy the case caption and case number exactly as it appears on the complaint/petition and prior court filings.
Not clearly selecting the correct service method (publication vs. posting)
This form references both “Service by Publication” and “Service by Posting,” and filers sometimes assume checking nothing is acceptable or they mark both without confirming which statute/procedure applies. Using the wrong method can result in ineffective service and later challenges to jurisdiction, potentially undoing orders or judgments. Confirm with the applicable statute/court order whether you need publication, posting, or both, and make the selection unambiguous on the form.
Failing to identify the defendant precisely
A common error is listing an incomplete defendant name (missing middle initial, suffix, or entity designation like LLC/Inc.) or using nicknames/aliases without clarity. If the defendant is not correctly identified, the service may be attacked as not reasonably calculated to give notice, and the court may require re-service. Use the defendant’s full legal name exactly as in the complaint and include known aliases only if clearly labeled and consistent with the case pleadings.
Checking multiple defendant-status boxes without factual support
The affidavit lists several grounds (resides outside Illinois, has gone out of state, cannot be found after diligent inquiry, concealed within the state), and people sometimes check several “just in case.” Overbroad or unsupported assertions can undermine credibility and lead the court to deny the request for constructive service. Select only the statement(s) you can truthfully support and be prepared to explain the basis for each selection.
Using vague or conclusory language for “diligent inquiry”
Filers often state “cannot be found after diligent inquiry” without documenting what was actually done (e.g., searches, contacts, last known employer/relatives, databases). Courts may reject the affidavit or require a more detailed showing because constructive service is a last resort. Before signing, ensure you can articulate specific steps taken to locate the defendant and that those steps are recent and reasonable.
Providing an incomplete or improperly formatted residence address
People frequently omit apartment/unit numbers, city, state, or ZIP, or they put a mailing address where a residence is requested. Incomplete addresses can prevent required mailing, reduce the likelihood of actual notice, and trigger re-filing or additional court scrutiny. Enter the full address in standard USPS format (street, unit, city, state, ZIP) and confirm it is the defendant’s residence or last known residence as required.
Marking “Cannot be ascertained” while still having last-known information
Some filers check “Cannot be ascertained after diligent inquiry” but then fail to complete the “last known place of residence” section, or they leave it blank because they are unsure. If you have any last-known address information, the court typically expects it to be provided to support mailing and notice efforts. If the current residence is unknown, still complete the last-known address fields as fully as possible and explain gaps only when truly unknown.
Confusing the affiant with the attorney or failing to identify the affiant
The form requires an “Affiant” (the person swearing to the facts), but people sometimes put the attorney’s name by default or leave the affiant line blank. If the wrong person signs (someone without personal knowledge) or the affiant is not identified, the affidavit may be invalid and service may be challenged. Ensure the affiant is the person with knowledge of the search efforts and facts, and clearly print/type the affiant’s name where indicated.
Signing without proper oath/verification requirements
Because it is an affidavit “on oath,” some filers sign casually without notarization when required by local practice, or they misunderstand the 735 ILCS 5/1-109 certification language and omit required signature elements. An improperly executed affidavit can be rejected or later attacked, delaying service and the case. Follow the court’s filing requirements for affidavits (including notarization if required) and ensure the signature and date are properly completed.
Leaving attorney identification fields incomplete (Atty. No., contact info, email)
On page 2, filers often skip the attorney number, phone, address, or primary email, especially when rushing or when self-represented parties are unsure what applies. Missing contact information can cause filing delays, prevent notices from being sent, or create confusion about who is responsible for the publication/posting process. Attorneys should complete all attorney fields accurately; self-represented filers should follow the form’s instructions for pro se entries (and provide their own contact information where applicable).
Inconsistent information between the affidavit and other case filings
A frequent issue is that the defendant name, last known address, or service assertions differ from what was stated in the complaint, summons returns, or prior affidavits. Inconsistencies raise red flags and can lead to denial of constructive service or later motions to vacate for improper notice. Before filing, cross-check all names, addresses, and factual statements against the pleadings and any prior service attempts to ensure they match or are clearly explained.

Frequently Asked Questions About CCG 0013

 

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It is encrypted in transit and at rest, and it is never used to train AI.
How complex is CCG 0013 to fill out?
CCG 0013 has a Form Complexity Index of 38 out of 100, in the basic tier: 30 fillable fields across 2 pages. Instafill.ai's AI fills it in under a minute, with every field there for you to review before you download.
What is this “Affidavit for Service by Publication/Posting” form used for?
This affidavit asks the court to allow “constructive service” (service by publication or posting) when the defendant cannot be personally served. It supports a request under 735 ILCS 5/2-206 and/or 735 ILCS 5/9-107.
Who should fill out and sign this affidavit?
The “Affiant” (the person making the sworn statements) completes and signs it—often the plaintiff, the plaintiff’s attorney, or another person with personal knowledge of the search efforts. The affiant must be able to truthfully swear to the facts stated.
When can I use service by publication or posting instead of personal service?
You generally use it when the defendant is outside Illinois, has left the state, cannot be found after diligent inquiry, or is concealed within the state so process cannot be served. The affidavit is meant to show why normal service is not possible.
What does “diligent inquiry” mean on this form?
It means you made reasonable, good-faith efforts to locate the defendant before asking for publication/posting. Typical efforts may include checking last known addresses, contacting known relatives/employers, searching public records, or other practical steps to find the defendant.
Do I have to choose between publication and posting, or can it be both?
The form title references both publication and posting, but what you can use depends on your case type and what the judge orders. If you are unsure which method applies, review your case requirements or ask the clerk or an attorney for guidance.
What information about the defendant is required in Section 1?
You must list the defendant’s name and indicate the reason service cannot be made (outside the state, gone out of state, cannot be found after diligent inquiry, or concealed within the state). Only select statements that are true based on your efforts and knowledge.
What do I put in Section 2 if I know the defendant’s current address?
Enter the defendant’s place of residence (address, city, state, zip). Provide the most accurate current residence information you have.
What if I do not know the defendant’s current address?
If the current residence cannot be ascertained after diligent inquiry, indicate that and provide the defendant’s last known address information. The court typically expects you to list the last known residence if you have it.
What is the “mailing certificate” mentioned in 735 ILCS 5/2-206, and is it included here?
The statute references mailing requirements in some situations, but this excerpted form mainly captures the affidavit statements about the defendant’s location and your inquiry. You may need additional paperwork or steps (such as mailing and proof of mailing) depending on the judge’s order and your case type.
Where do I put the case number and case caption (plaintiff/defendant names)?
Fill in the case caption at the top of the form (the “v.” line for the parties) and the “Case No.” field. Use the same names and case number exactly as they appear on your court case.
Do I need to notarize this affidavit?
The form states it is made “on oath” and includes a certification under 735 ILCS 5/1-109. Court requirements can vary, so follow the filing instructions for your courtroom; if notarization is required for your situation, sign in front of a notary.
What does the certification under 735 ILCS 5/1-109 mean for me?
It means you are certifying under penalty of law that the statements are true and correct. Do not guess—only include information you know is accurate and supported by your search efforts.
What attorney information is required on page 2?
If an attorney is involved, page 2 asks for the attorney number, attorney name, who the attorney represents, address, phone number, and primary email. If you are self-represented, follow local filing instructions for how to list your contact information in place of attorney details.
How do I submit this form in Cook County Circuit Court?
Typically, you file it in your case with the Clerk of the Circuit Court of Cook County, either electronically (if required/available for your case type) or in person at the appropriate filing location. After filing, you usually must obtain a judge’s order before publication/posting occurs.
How long does it take for service by publication/posting to be completed?
Timing depends on the court’s order and the publication/posting requirements (for example, how many weeks the notice must run). Plan for additional time beyond normal service because publication/posting and proof of completion can take several weeks.
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