Mercer County Genealogy Records
Mercer County genealogy records span more than two centuries of family history in western Pennsylvania. The county was formed from Allegheny County in 1800, and its courthouse has held vital records, land deeds, probate files, and court documents ever since. Researchers searching for Mercer County ancestors will find birth and death records, marriage licenses, will books, and deed indexes at the county seat in Mercer. State archives and the Mercer County Historical Society add more depth to any search.
Mercer County Quick Facts
Mercer County Recorder of Deeds
The Mercer County Recorder of Deeds office is located at 109 Courthouse, Mercer, PA 16137. The phone number is (724) 662-3800. Office hours run Monday through Friday from 8:30 AM to 4:30 PM. This office holds land records going back to 1800, covering deeds, mortgages, agreements, easements, and subdivision plans.
An online index is free to view with guest access. Fees apply for viewing document images for records from 1986 forward. The county uses the PropertyCheck system so you can set up alerts for activity on your family properties. Earlier Mercer County land records from 1787 to 1828 are held in Allegheny County and may be needed for older family lines that predate the county's formation. Copy fees are $0.50 per page, with an additional $1.50 for certified copies.
The Recorder's office indexes documents by grantor and grantee name, book and page, document type, date range, and instrument number. eRecording is available for those submitting documents remotely. Mail requests are also accepted for those who cannot visit in person.
The Pennsylvania State Archives in Harrisburg supplements local Mercer County records with statewide collections of military records, census materials, and early colonial documents.
Mercer County Wills and Probate Records
The Mercer County Register of Wills and Orphans' Court is at 125 S. Diamond Street, Suite 112, Mercer, PA 16137. Phone is (724) 662-3800 ext. 2248. This office handles all probate records, estate administration, guardianship files, and marriage licenses.
Will books in Mercer County date from 1804. Marriage records run from 1885 to the present. Birth and death records at the county level cover 1893 to 1905, a period when Pennsylvania required county-level registration. Estate files, Orphans' Court dockets, and adoption records are all held here. Adoption records are restricted and require a court order. Genealogists researching Mercer County lines will find estate inventories particularly useful for identifying personal property and family relationships.
Note: Mail requests to this office should include all known details about the person, the approximate year of the record, and a self-addressed stamped envelope for the reply.
Mercer County Vital Records and Birth Documents
Vital records for Mercer County residents are divided between the county and the state. County-level birth and death records cover 1893 to 1905. For records after that period, contact the Pennsylvania Department of Health Division of Vital Records. Under 35 P.S. §450.801, certified copies of vital records are issued to qualified applicants including genealogical researchers.
Marriage licenses from 1885 to present are held at the Register of Wills in Mercer. Earlier marriages may appear in church records or county court minutes. The Mercer County Historical Society holds published genealogical materials and family files that can fill gaps in the official record. For records older than 1885, church registers are often the best source for Mercer County families.
Mercer County Historical Society Resources
The Mercer County Historical Society at mchsofpa.org provides research assistance for Mercer County genealogy. Phone: 724-662-3490. The Society holds a family file collection, local history publications, obituary indexes from area newspapers, and archives on county history. Research volunteers assist with searches. The MCHS obituary index covers local papers and serves as a key finding tool for death dates and family information.
Military records for Mercer County veterans are also maintained at the historical society. Museum collections include photographs, documents, and artifacts that can help you visualize your ancestors' lives. Educational programs and archives access are available. Contact the society before visiting to confirm hours and access procedures.
The State Library of Pennsylvania offers additional online guides for finding county-level records across Pennsylvania, including Mercer County resources.
Online Mercer County Records and Databases
Mercer County has made some records available online. The Recorder of Deeds offers free index access and paid image access through their online portal at mercercountypa.gov/recorders. PropertyCheck lets you monitor property activity. Landex provides access to deed index records from 1986 forward.
FamilySearch.org holds a range of Mercer County collections including census records, early vital records, and church registers. The PA State Archives offers online finding aids for collections that include Mercer County materials. Ancestry.com holds federal census records and some state collections for Mercer County. The USGenWeb project maintains free indexes for many Pennsylvania counties as well.
Under 65 P.S. §§ 67.101, Pennsylvania's Right-to-Know Law gives the public access to government records. Most Mercer County records held by county offices are public and available upon request during office hours.
Note: Online access to older Mercer County deed images requires a paid account with the county's document portal; the free index only shows names and dates, not the full document text.
Mercer County Land and Court Records
Land records are among the most useful genealogy tools in Mercer County. Deeds often name multiple family members, show property boundaries that identify neighbors, and reveal migration patterns. Mercer County deed records begin in 1800. The Recorder of Deeds indexes all transfers, mortgages, liens, and easements. Checking both grantor and grantee indexes for a surname often turns up multiple generations of the same family.
Court records in Mercer County include civil cases, criminal proceedings, and Orphans' Court matters. The Prothonotary maintains civil and domestic records. Naturalization records for Mercer County immigrants are available through the court. These documents can show a person's country of origin, date of arrival, and names of witnesses, all of which are valuable for tracing immigrant ancestors. Act 127 of 2016 governs access to court records in Pennsylvania; more information is available through the Library of Congress Pennsylvania genealogy guide.
Nearby Counties
Mercer County sits in the far northwest of Pennsylvania and borders Ohio to the west. Families in the region often had ties to neighboring counties. Check adjacent county records when Mercer County records are incomplete.