SearchSystems Editorial
Edited by Sam Rokni — Editor & Owner, SearchSystems.net. Public records professional since 1999. NAPBS founding member. Full bio & credentials.
Last reviewed: June 04, 2026 · Methodology: all Mercer County record-source URLs verified against the official local and Illinois state publishers on the review date. 3 primary .gov / official sources cited below.
Mercer County — Key Numbers (2026)
Population, demographics, and county-seat data for Mercer County, Illinois — verified against U.S. Census 2024 estimates.
15,292
Population
Census estimate
6,435
Households
Census estimate
$67,028
Median income
Annual household
$131,000
Median home value
Census ACS
Aledo
County seat
In Illinois
Criminal records
1 source
Court records
2 sources
Wants & warrants
see state portal
Property records
2 sources
Vital records
2 sources
Voter records
2 sources
Professional licenses
1 source
Recorded documents
see state portal
Count of verified official sources per record type. Multiple sources One source Use state portal
Mercer County Records at a Glance
| Record type | Mercer County verified sources |
|---|---|
| Court records | State of Illinois Office of the Illinois Courts Mercer County Sheriff, IL |
| Criminal records | Sex Offenders |
| Wants & warrants | No verified source — see Mercer County state portal below |
| Property records | The Mercer County Supervisor of Assessment Office Mercer County Property Tax Inquiry |
| Vital records | MERCER COUNTY, IL Unofficial Primary Results 3-19-2024 |
| Voter records | MERCER COUNTY, IL Mercer County |
| Professional licenses | Professional License Look-up |
| Recorded documents | No verified source — see Mercer County state portal below |
Count of officially verified .gov / .us record sources cataloged for Mercer County. Data verified June 04, 2026.
What Changed in 2026 — Mercer County Records
2026
Mercer County official government portal active
The official Mercer County government website at www.mercercountyil.org continues to serve as the canonical local source.
2026
Mercer County court records portal verified
State court system links for Mercer County verified against the Illinois judiciary portal in 2026.
2026
Mercer County criminal records access
State criminal records repository for Mercer County (statewide system, not county-specific) confirmed active in 2026.
2026
Mercer County property records online
Mercer County property assessment and recorder office online portal active in 2026.
The 4-Step Mercer County Records Pathway
1
Step 1 — Start at the Mercer County clerk/courthouse
For most local records (court cases, property deeds, marriage licenses), the Mercer County clerk's office is the first stop.
2
Step 2 — Use the Illinois statewide systems
Criminal background, court case search, voter registration, and professional licensing are all run at the Illinois state level — not by the county.
3
Step 3 — Federal sources for federal records
Federal court cases (PACER), federal tax liens (IRS), military records (NPRC), and immigration data (ICE) are all federal — not held by the county.
4
Step 4 — Cross-check before relying on data
Most county portals lag 24-48 hours behind the courthouse. For time-sensitive verification, call the clerk directly.
Five Things People Get Wrong About Mercer County Records
❌ Myth: "Mercer County maintains all criminal records."
✓ Truth: False. Criminal records for Mercer County are held by the Illinois state repository, NOT the county. The county sheriff has only the local arrest log.
❌ Myth: "Records sealed in Mercer County are gone everywhere."
✓ Truth: False. Sealing removes records from public search but they still exist at the courthouse and may appear in FBI records (Identity History Summary).
❌ Myth: "Free 'instant background' sites have Mercer County data."
✓ Truth: False. Only the official Illinois state repository has verified, current Mercer County data. Free sites often have stale data.
❌ Myth: "The Mercer County assessor's value is what I'll sell my home for."
✓ Truth: False. The Mercer County assessor's value is for property tax purposes only — usually below market value.
❌ Myth: "All county records older than 50 years are public."
✓ Truth: Partially false. Public-records rules vary by record type AND state. Court records and deeds are usually older-public; vital records remain restricted longer (often 75-125 years).
Primary Sources (All Verified)
- www.mercercountyil.org — Official Mercer County government website
- www.illinoiscourts.gov — Court records — official source
- www.illinois.gov — Licenses — official source
- fbi.gov — FBI Identity History Summary (federal record)
Related — Mercer County & Illinois Records
For records not specific to Mercer County, use Illinois's statewide system or the national hub.
📍 Illinois statewide record systems:
- Illinois Court Records →
- Illinois Criminal Records →
- Illinois Property Records →
- Illinois Vital Records →
- Illinois Voter Records →
- Illinois Wants & Warrants →
- Illinois Licenses →
- Illinois Recorded Documents →
🇺🇸 National hubs:
Related Public Records
Illinois statewide records: Court records · Criminal records · Wants & warrants · Property records · Vital records · Voter records · Licenses · Recorded docs
National directories: Court records · Criminal records · Property records · Vital records · Federal databases
About Mercer County, Illinois
Mercer County is located in northwest Illinois. The county seat is Aledo (official site: http://www.mercercountyil.org/).
- Population: 15,292
- Households: 6,435
- Median household income: $67,028
- Median home value: $131,000
- Below poverty line: 8.0%
- Land area: 561.2 sq mi
- Population density: 27.2 people / sq mi
- Public libraries indexed: 5
- NCES schools indexed: 8
State of Illinois Office of the Illinois Courts
Official Free
The Office of the Illinois Courts provides information about the Illinois court system, including Circuit Courts, Appellate Courts, and the Supreme Court.
Mercer County Sheriff, IL
Official Free
The Mercer County Sheriff's Office is responsible for registering and gathering personal, employment, and address information on all sex offenders residing in Mercer County. Linked at the left, you will see the website for the Illinois State Police Sex Offender Registration Unit, which maintains a state-wide database with photos.
MERCER COUNTY, IL
Official Free
To obtain a Certified Copy of a Birth Certificate Record, you must be: -Person named on the record, if 18 years of age or older -Parent, if named on the record as the mother or father -Legal guardian who possesses guardianship papers from the court that have been signed by a judge -Court Order -Legal representative for the person named on the certificate, or for the parents listed To obtain a certified copy of a Death Certificate, you must be: -The informant listed on the death certificate -The next of kin -Someone who has a personal or property right interest in the record, and has documentat
Unofficial Primary Results 3-19-2024
Official Free
Election Summary Report GENERAL PRIMARY ELECTION TUESDAY, MARCH 19, 2024 MERCER COUNTY, ILLINOIS · March 19, 2024 Primary Election UNOFFICIAL RESULTS · Date: 3/19/2024 Time: 9:18:22 PM CDT ·
Birth, Death, Other Records - Illinois Department of Public Health
Official Free
Certified copies are available from the circuit court clerk in the county where the dissolution of civil union was granted. To learn more, see RESOURCES in the right-hand column and click on List of Circuit Court Clerks. The Division of Vital Records can · Archivos De Nacimientos, Defunciones, Y Otros Eventos Visit the Spanish language version of the IDPH Vital Records website.
MERCER COUNTY, IL
Official Free
Attention Employees and Retirees: Mercer County Clerk's office at (309) 582-7021 opt #4 , or by emailing bgerber@mercercountyil.org. Online - you may also pay your taxes by clicking PAY PROPERTY TAXES HERE .
Mercer County
Official Free
Verified as of · Limit search to maximum records · Display records per page · Rows per page · No records found · Print Results · * Designates From Party Records with Status Other than V or B = Not Verified Record · Records with Flag: ...
Illinois Online Voter Registration Application: Registration Lookup
Official Free
Home | State Board of Elections Vote In Illinois? Select a Language： 中文 English हिंदी Español · Home | SBE Home | App. Status | Contact Polling Place Locator Am I Registered to Vote? Select a language: 中文 English हिंदी Español · The registration period for the online voter registration
The Mercer County Supervisor of Assessment Office
Official Free
Note: Contact your Township Assessor for all assessment questions and parcel information inquiries. (contact list above) The Township Assessor is responsible for valuing real estate and assessing all property within their elected, appointed or contracted position of their township jurisdiction.
Mercer County Property Tax Inquiry
Official Free
Mercer County Property Tax Inquiry · Mercer County Property Tax Inquiry Close · Parcel Search · Mobile Home Search · Disclaimer · All payments must have a payment stub with them, unless you are paying with credit or debit through GTS. Duplicate bills will cost $5.00 .
Sex Offenders
Official Free
Close PACER Case Locator PACER Log in Manage PACER Account · An official website of the United States government Log in to Official websites use .gov A .gov website belongs to an official government organization in the United States. Secure .gov websites use HTTPS A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites. Type the name of a federal court to find links to login to CM/ECF – or – search by other information unique to that court, like their contact information, RSS feed, county codes, and…
VINE is not working right now - VINELink
Official Free
ALL PERSONAL INFORMATION SUBMITTED BY USERS OF THIS SITE WILL BE KEPT CONFIDENTIAL AND WILL BE USED ONLY FOR VINE SERVICES, INCLUDING NOTIFICATION PURPOSES. The VINE service representatives may contact you from time to time to ask about your experience with the VINELink site and our VINE services.
Professional License Look-up
Official Free
The Illinois Department of Financial and Professional Regulation provide online public access through its 'License Lookup' to search and verify all Illinois professional license holders
IDFPR Online Services Portal
Official Free
Welcome to the IDFPR Online Services Portal ! Please allow 2-4 business days for your application to post in our systems and your license status to update. If you attempted to make an online payment on April 2, 2026, please do not try to submit another payment.
Mercer County Precinct Maps
Official Free
www.elections.il.gov - /precinctmaps/ · [To Parent Directory] 1/25/2022 9:55 AM <dir> Adams 11/9/2021 1:21 PM <dir> Alexander 11/9/2021 1:21 PM <dir> Aurora 11/9/2021 1:21 PM <dir> Bloomington 11/9/2021 1:21 PM <dir> Bond 1/25/2022 9:56 AM <dir> Boone 11/9/2021 1:21 PM <dir> Brown 11/9/2021 ...
Mercer County Home Page
Official Free
Field notes are the narrative record of the cadastral survey . They are written in tabular format and contain the detailed descriptions of entire survey process including the instrumentation and procedures utilized, calling all physical evidence evaluated in the survey process, and listing all ...
MERCER COUNTY, IL
Official Free
document Header Mercer County Zoning Ordinance · Mercer County Snow Policy.pdf · document Header Mercer County Snow Policy.pdf · Mercer County Prevailing Wage Ordinance for 2018-19.pdf · document Header Mercer County Prevailing Wage Ordinance ...
Frequently Asked Questions
How do I look up court cases in Mercer County?
Mercer County court cases are filed with the Circuit Clerk. Search the State of Illinois Office of the Illinois Courts portal: https://www.illinoiscourts.gov/. For federal matters, see PACER.
Can my employer see a sealed record in Illinois?
Generally, most private employers running a standard name-based check cannot see a sealed Illinois record. However, government employers, law enforcement, schools, healthcare facilities, and any role requiring a fingerprint-based check can see sealed records under specific statutory exemptions. Confirm specifics with the sealing court.
What's the difference between sealing and expunging a record in Illinois?
In Illinois, a sealed record is hidden from public view but still exists and remains visible to law enforcement, licensing boards, and some employers. An expunged record is treated by Illinois law as if it never happened — though FBI and federal records may persist regardless of state action. The relief process runs through the sentencing court.
What's the difference between a court record and a criminal record in Illinois?
A court record shows everything filed in a specific case — pleadings, motions, judgments. A criminal record (rap sheet) is a person-centric history from the Illinois State Police that aggregates arrests and dispositions across all courts in Illinois. Court records are searched by case; criminal records by person.