Mon–Fri 9–5 EST · Nationwide
Serve legal documents anywhere in Illinois with confidence. Served 123 LLC coordinates sheriffs, licensed private detectives, and court-appointed special process servers across all 102 Illinois counties — from Chicago and the collar counties to the Metro East and the southern tip — delivering same-day service and affidavits that hold up in Cook County and every circuit court in the state.
Illinois has one of the strictest process-server regimes in the country. Under 735 ILCS 5/2-202, service may be made by the sheriff of the county, a coroner (if the sheriff is a party), or a special process server appointed by the court on motion. Illinois does not allow general civilian service without appointment — and in Cook County, private process service specifically requires a licensed private detective under 225 ILCS 447/15-10, or case-specific court appointment. Served 123 LLC coordinates with sheriffs statewide, licensed Cook County detectives, and handles the Motion for Special Process Server Appointment for the balance of the state.
Personal service is the default under 735 ILCS 5/2-203(a)(1). Abode (substituted) service may be effected under 5/2-203(a)(2) by leaving a copy of the summons at the defendant's usual place of abode with some person of the family or residing there, age 13 or older, informing that person of the contents, and mailing a copy to the defendant at the same address. Note Illinois's 13-year-old age threshold — it's one of the lowest in the country and trips up counsel used to 18-year-old thresholds. Corporate service is governed by 5/2-204, long-arm jurisdiction by 5/2-209, and publication service by 5/2-206.
Out-of-state counsel regularly stumble on two Illinois traps: (1) trying to use an unappointed civilian server in Cook County (instant motion to quash), and (2) omitting the abode-mailing step. Served 123 LLC's Illinois practice is built to avoid both. Every Cook County service goes through a licensed detective; every downstate service uses sheriff or court-appointed server; every abode return confirms the mailing.
Sheriff, Cook County licensed detective, or court-appointed special process server · Up to three diligent attempts · GPS-timestamped verification · Return of Service compliant with 735 ILCS 5/2-203(b) · Abode-mailing confirmation on substituted service · Motion for Special Process Server Appointment preparation when needed · Skip tracing at no additional charge.
Within those 102 counties, we routinely serve in Illinois's largest cities and legal markets:
What to include: recipient name, service address (Illinois county), court, document type, and deadline. Most requests are priced and confirmed within 5–10 minutes during business hours.
Start Your Illinois Quote →Same-day service in Chicago, the collar counties, Springfield, Peoria, and Rockford. Cook County licensed detectives + statewide Motion for Special Process Server Appointment coordination.
