Mercer County Genealogy

Mercer County genealogy records are managed by the county clerk in Aledo, a small town in western Illinois near the Iowa border. The clerk holds birth, death, marriage, and land records for the county. Searching Mercer County genealogy files can be done in person at the courthouse, by calling (309) 582-7021, or through a mailed request. The county sits along the Mississippi River corridor, and many early settlers came from the east or crossed over from Iowa. The IRAD depository at Western Illinois University in Macomb preserves older Mercer County government records that have been transferred from the Aledo courthouse for long-term storage.

Mercer County Clerk Records

The Mercer County Clerk is at 100 SE 3rd St, Aledo, IL 61231. The phone number is (309) 582-7021. This is the main office for vital records, marriage licenses, and land documents in Mercer County. Birth and death records start around 1877, which is when most Illinois counties began recording vital events under state law. Marriage records may go back further to the 1820s when the county was first organized. The Counties Code (55 ILCS 5) names the county clerk as the legal keeper of these files.

In-person visits to the Aledo courthouse get the fastest results. Staff can help you search the old index books and pull records on the spot. Bring the full name and any dates you have. A rough year range is better than nothing. For mail requests, send a letter to the clerk with the name, dates, record type, your check, and a copy of your photo ID. Make checks payable to the Mercer County Clerk. Include a return address so the office can send copies back to you.

Mercer County Land and Property Files

Land records are a strong genealogy tool in Mercer County. Deeds, mortgages, and property transfer documents can put your ancestor in a specific place at a specific time. This is especially useful for the period before 1877 when birth and death certificates did not exist at the county level. Mercer County was organized in 1825. If your family owned land along the Mississippi River or farmed near Aledo during the 1830s or 1840s, the deed books may be the only written proof of their time in the area.

The recorder's office in Aledo keeps all property files. You can search them during business hours. The Local Records Act (50 ILCS 205) protects these documents from disposal and requires that county records with long-term value get preserved.

Note: Mercer County's early organization means land records could date back to the mid-1820s for some areas.

Mercer County Records at IRAD

The IRAD depository for Mercer County is at Western Illinois University in Macomb. Call (309) 298-2716 to ask what Mercer County files they hold. IRAD stores older government records transferred from the Aledo courthouse, including court case files, probate records, naturalization papers, and other historical documents. Research at IRAD is free. You can photograph documents at no charge. Staff take mail and phone requests but limit each to two names.

Use the IRAD holdings database on the State Archives site to look up what Mercer County records are at WIU before visiting. Check the inventory online first so you know what is available. Macomb is a reasonable drive from Aledo, so combining a courthouse visit with an IRAD trip is doable in a single day if you plan ahead. The IRAD system was created under the Local Records Act to make sure county records with research value are saved.

Searching Mercer County Genealogy

Start at the Mercer County Clerk for local records. For state-level records from 1916 forward, the Illinois Department of Public Health keeps birth and death files. IDPH genealogy requests must go by mail. Processing takes about 12 weeks. The state charges $10 per genealogy copy. Birth records are available 75 years after the date of birth. Death records open after 20 years. These thresholds come from the Vital Records Act (410 ILCS 535).

The Illinois State Archives has free databases that cover Mercer County. The statewide marriage index runs from 1763 to 1900. Death indexes cover the pre-1916 era and 1916 to 1950. These are good starting points for home research before you contact the clerk or visit IRAD in Macomb.

The Freedom of Information Act (5 ILCS 140) covers public records access in Illinois. But vital records have their own rules under the Vital Records Act that take priority over FOIA.

• IDPH genealogy birth copy: $10 by mail, about 12 weeks
• IDPH death research copy: $10 by mail
• IRAD at WIU Macomb: free research
• State Archives databases: free online
• Contact Mercer County Clerk for local fee amounts

Mercer County Vital Records Access

Mercer County does not have its own online genealogy search tool. Record requests go through the clerk's office in Aledo by phone, mail, or walk-in visit. For statewide access, the IDPH Division of Vital Records handles birth and death records from January 1916 forward. The state death certificate ordering page below shows the process for getting copies from IDPH.

The IDPH site lists fees, mailing addresses, and forms needed for each record type. For Mercer County records before 1916, the Aledo clerk or IRAD at Western Illinois University are the only sources. Those early records were never sent to the state level.

Nearby Counties

These counties border Mercer County in western Illinois. Families living near a county line may have records filed in a neighboring county. Check these areas if a Mercer County search does not turn up what you need.