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Essential Legal & Government Offices in Union County, Ohio

A Guide by Nicolas C. Oehler

For residents, businesses, and legal practitioners in Union County, Ohio, understanding the local institutions that manage courts, property, finances, and public records is essential. Union County’s government offices serve as the structural backbone of legal matters ranging from real estate transactions to estate filings, civil litigation, and public safety regulation.

Below are the most important legal-related offices you should know, complete with descriptions and links.

1. Union County Courthouse & Clerk of Courts

The Union County Courthouse is home to several courts and judicial functions.

Court of Common Pleas – General Division

Handles major civil litigation, felony criminal cases, and domestic relations.

Clerk of Courts

Responsible for maintaining official court records, filings, and docketing. Also oversees title operations.

2. Probate & Juvenile Court

Oversees estates, guardianships, trusts, marriage licenses, adoptions, and juvenile matters.

3. Marysville Municipal Court

Handles traffic offenses, misdemeanors, small claims, evictions, and civil matters under monetary limits.

4. Union County Recorder

The Recorder’s Office is critical for real estate transactions, as it maintains deeds, mortgages, easements, plats, and liens.

5. Union County Auditor

A key office for property valuation, real estate tax assessments, and property transfers.

Attorneys and property owners interact with the Auditor for:

Tax valuation challenges
CAUV program filings
Deed transfers (conveyance forms)
Tax maps and property information

6. Union County Treasurer

Responsible for collecting property taxes and managing tax payment plans.

Important for:

Verifying tax payment status during real estate deals
Property tax delinquency issues
Escrow and tax lien questions

7. Union County Engineer

Crucial for any project involving land, construction, or roadways.

The Engineer’s Office manages:

Roadway and bridge maintenance
Subdivision regulations
Drainage and stormwater approvals
Property surveying and technical maps

Useful for land development, construction, zoning matters, and due diligence.

8. Union County Building Department

Handles building permits, inspections, and code enforcement — essential for real estate development, construction, and zoning compliance.

9. Union County Prosecutor’s Office

Represents the State of Ohio in criminal matters and advises county officials.

Attorneys may interact with this office for:

Criminal prosecutions
Victims' rights matters
Legal opinions for county government

10. Union County Sheriff’s Office

Handles law enforcement functions, civil process service, concealed carry licensing, and sex offender registry.

Important for:

Sheriff’s sales (foreclosures)
Service of subpoenas and civil paperwork
Criminal justice interactions

11. Marysville City Government (If within city limits)

For matters in Marysville: zoning, permits, utilities, and local code enforcement.

Disclaimer: This post is for general informational purposes only and does not constitute legal advice. Reading this article does not create an attorney-client relationship. Every situation is unique, and you should consult with qualified legal counsel before making decisions regarding your specific business or legal matter.

Nicolas C. Oehler

Sunday, December 7, 2025