Overview
Process Server in Illinois: How Service of Process Works
Illinois has no separate process server license. Under section 2-202 of the Code of Civil Procedure, summons are served by the sheriff, by a private detective licensed or registered under Illinois law, or by a special process server the court appoints. Cook County long required a court appointment first; recent changes now allow licensed private detectives to serve there too, so we confirm the current Cook County practice for each case. Papers can be left at the home with a household member aged 13 or older, plus a mailed copy.
Who serves process
Who Can Serve Legal Documents in Illinois
Under 735 ILCS 5/2-202, process may be served by the sheriff, by a private detective licensed or registered under the Private Detective, Private Alarm, Private Security, Fingerprint Vendor, and Locksmith Act, or by a person the court specially appoints. Illinois doesn't issue a separate process server license.
For years, Cook County required a special court appointment before a private detective could serve. Illinois practitioners report that licensed private detectives may now serve in Cook County without one, so we confirm the current requirement before serving there.
Typical documents include summonses and complaints, eviction (forcible entry and detainer) papers, subpoenas, family law petitions and orders of protection.
Proof you receive: a sworn affidavit of service
A private detective's affidavit of service states that they are licensed or registered with the Illinois Department of Financial and Professional Regulation and describes how, when and where service was made, including any mailing for abode service.
Statewide service, including Cook County
Service in all 102 counties by licensed private detectives, with Cook County requirements checked for every case.
Abode service done right
Abode service with a qualifying household member and the required mailing, documented in an affidavit that meets section 2-203.
Special order and electronic service support
Diligent attempts and records to support a section 2-203.1 or Rule 102(f) motion when the defendant can't be served normally.
The rules
Illinois Service of Process Rules
The Illinois laws and rules that matter most for service:
| Rule | What it covers |
|---|---|
| 735 ILCS 5/2-202 | Who may serve process, including in Cook County |
| 735 ILCS 5/2-203 | Personal and abode service (household member aged 13+) |
| 735 ILCS 5/2-203.1 | Service by special order of the court |
| 735 ILCS 5/2-204 | Service on corporations |
| Ill. S. Ct. R. 101(d) | Most summonses must be served within 30 days of their date |
| Ill. S. Ct. R. 102(f) | Court-ordered electronic service |
| Ill. S. Ct. R. 103(b) | Dismissal for lack of diligence in service |
Treaties
Illinois and the Hague Conventions: Treaty Status
The Hague Service Convention lets member countries send documents to each other's Central Authorities for service. Illinois has not joined it, so that route isn't available, and the Convention's Article 10 rules on postal and private service don't apply. Whether those methods are acceptable depends on Illinois's law and on what your court allows.
Illinois is not a party to the Hague Evidence Convention, so requests for witness testimony or documents go through letters rogatory.
