Illinois Apostille & Document Authentication
For Illinois school records, the school's signed certification matters. For a divorce decree, the court's certification matters. Preparing the correct signature avoids unnecessary notarization.
School and court documents
The Illinois Secretary of State authenticates eligible Illinois official or notarial signatures. For diplomas and transcripts, a school official certifies and signs before an Illinois notary. Do not notarize documents signed by a Circuit Clerk or Circuit Judge; they need the official seal, signature, printed name and title.
Certified records and mail checklist
Birth, death and marriage records require eligible official certification; divorce decrees require Circuit Clerk certification. Include the original certified or properly notarized document, completed application identifying the country of use, payment and prepaid return envelope. Mail to Index Department, 160 N. LaSalle Street, Suite 100, Chicago, IL 60601.
Timing and preparation risks
Premier's typical other-state estimate is 5–7 business days, with shipping additional. Illinois lists 7–14 business days for mailed requests; confirm the applicable route after review. Wrong-state signatures, ordinary photocopies or incomplete school certification are review risks, not measured rejection rates.
Frequently asked questions
Will Illinois authenticate an FBI check?
Federal documents need the federal route. Federal timing is confirmed after document review.
Is translation automatic?
Confirm language and format with the receiving authority.
Official sources
Reviewed on 2026-10-13
Premier document review and timing
Missouri service takes 24–48 hours; other-state service typically takes 5–7 business days. We confirm the estimate for your document and submission route. Federal timing is confirmed after document review. Shipping time is additional. These are Premier service estimates, not government guarantees.
Monday–Friday, 9:00 AM–4:00 PM CST. By appointment only.
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