Find Carroll County Genealogy

Carroll County genealogy records are maintained by the county clerk in Mt. Carroll, a small county seat in northwestern Illinois along the Mississippi River. The clerk at 301 N. Main St holds marriage licenses, birth and death registers, land records, and other vital documents going back to the county's formation. Carroll County has about 14,000 residents and a recording fee structure that changed in February 2025. The IRAD depository at Northern Illinois University in DeKalb preserves older Carroll County government records. Whether you search in person at the Mt. Carroll courthouse or through IRAD, Carroll County offers solid resources for tracing family lines in this part of the state.

Carroll County Clerk Records

The Carroll County Clerk is at 301 N. Main St in Mt. Carroll. Call 815-244-0221 for questions about records and fees. This office handles all local vital records, land filings, and marriage licenses. The Counties Code (55 ILCS 5) makes the county clerk the legal custodian of these files. Carroll County was organized in 1839, and some records go back to that era.

As of February 20, 2025, Carroll County charges a flat $75 recording fee. This applies to documents being recorded with the clerk's office. Genealogy copy fees are separate. The recording fee change is worth noting if you need to file anything or if you are trying to understand charges on older documents. Marriage record copy fees in Carroll County follow the standard Illinois schedule, with older records costing more due to the extra search time involved in locating them in handwritten ledgers.

The Mt. Carroll courthouse is the best place for in-person research. Staff can search indexes by name and date while you wait. Mail requests are also accepted. Send the full name, approximate date range, what type of record you want, your payment, and a copy of your photo ID. Make checks payable to the Carroll County Clerk.

Carroll County birth and death records from the late 1870s may exist locally. Coverage before 1916 is spotty across all Illinois counties. Marriage records are the most complete early documents for Carroll County genealogy research.

Carroll County Vital Records

The Vital Records Act (410 ILCS 535) controls access to Illinois vital records including those in Carroll County. Birth records open for genealogy after 75 years. Death records open after 20 years. Marriage records open after 50 years. That means Carroll County records from the 1800s and early 1900s are fully available for family research.

For Carroll County birth and death records from 1916 onward, the Illinois Department of Public Health maintains statewide files. IDPH genealogy requests are mail-only and cost $10 per copy. Processing takes about 12 weeks. The state death certificate ordering page shown below explains how to request copies.

That page covers the process for ordering death records through the state. Genealogy copies carry a stamp marking them for research use only. They cannot be used for legal identification. If you need a certified copy for court or a government agency, different eligibility rules and fees apply through the Carroll County Clerk.

Carroll County Records at IRAD

The IRAD depository for Carroll County is at Northern Illinois University in DeKalb. Call (815) 753-1807 to ask about Carroll County holdings. IRAD preserves older county government records transferred from the courthouse in Mt. Carroll. Holdings can include historical vital records, court files, probate records, naturalization papers, and voter lists. Research at IRAD is free and you can take photographs of any documents at no charge.

Use the IRAD holdings database to check what Carroll County records are stored at NIU before visiting DeKalb. The Local Records Act (50 ILCS 205) is the state law that created IRAD. It requires counties to preserve records with lasting historical value rather than discarding them. For Carroll County, this means old courthouse documents end up at NIU when storage space in Mt. Carroll runs short.

The Local Records Act shown above protects Carroll County's historical government documents from destruction. IRAD staff handle phone and mail requests but limit each one to two names per inquiry.

Note: IRAD at NIU is free to use and limits mail or phone requests to two names per inquiry for Carroll County records.

Searching Carroll County Genealogy

The Illinois State Archives has free online databases with Carroll County entries. The statewide marriage index covers 1763 to 1900. Death indexes span the pre-1916 era and 1916 to 1950. These indexes are useful starting points for Carroll County research from home before you contact the clerk or visit IRAD.

Carroll County sits in the Fifteenth Judicial Circuit. Court records from this circuit hold genealogy clues that vital records miss. Divorce files, estate cases, guardianship records, and land disputes all name family members and show relationships. The circuit clerk in Mt. Carroll handles court records separately from the county clerk. Older court files may be at IRAD in DeKalb. The Freedom of Information Act (5 ILCS 140) applies to public records requests in Carroll County, though vital records follow their own rules under the Vital Records Act.

• State Archives marriage index: 1763 to 1900
• State Archives death index: pre-1916 and 1916-1950
• IRAD at NIU: free research, two-name limit by mail
• IDPH genealogy copy: $10 by mail, about 12 weeks
• Carroll County recording fee: $75 flat (eff. Feb 2025)

Nearby Counties

Carroll County is in northwestern Illinois along the Mississippi River. Families here moved between neighboring counties and across the river into Iowa. Check these surrounding counties if your Carroll County search comes up short.