Mercer County Child Custody Attorneys

Reviewed by Stephanie Green · Managing Partner & Co-Founder · Last updated June 11, 2026

Mercer County, Ohio · Celina · Probate/Juvenile Division

In Ohio, "custody" means the allocation of parental rights and responsibilities. In Mercer County, where you file depends on whether the parents were married — the General Division for married or divorcing parents, and the Probate/Juvenile Division (Suite 307) for never-married parents. The court decides using the R.C. 3109.04(F) best-interest factors.

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Flat-fee and full-representation options: we handle the filings, the Mercer County local forms, the court strategy, and the hearings — and you know the price before we start.

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How do I file for custody in Mercer County, Ohio?

If you and the other parent were married, custody is decided inside your divorce or dissolution in the General Division — file the Parenting Proceeding Affidavit and an Ohio child-support worksheet with your case packet. If you were never married, file a Complaint for Allocation of Parental Rights & Responsibilities in the Juvenile Court (Suite 307, $200 deposit); paternity must be established first if it hasn't been. The court applies the R.C. 3109.04(F) best-interest factors and sets parenting time under the SO 2 / Local Rule 7 schedule. In a DR case, parents of minors must complete the $30 A-OK Parenting Program before the final hearing.

Custody in Mercer County, handled by Gavvl Law

In Ohio, custody means the allocation of parental rights and responsibilities, and in Mercer County where you file turns on whether the parents were married — married or divorcing parents are heard in the General Division, while never-married parents file a Complaint for Allocation in the Juvenile Court (Suite 307, $200 deposit). Either way the judge applies the R.C. 3109.04(F) best-interest factors and sets time under the SO 2 / Local Rule 7 schedule. Gavvl Law files in the right court, proves the best-interest case, and works for one flat fee agreed up front, with payment plans and full representation for contested cases.

Married or not decides the courthouse. Custody rides inside a divorce in the General Division for married parents but is a standalone Juvenile Court case for never-married parents — and for never-married fathers, paternity has to be established first. We open the case in the correct court so the deposit and forms aren't wasted.
A best-interest case, not just a request. Ohio custody is decided on the R.C. 3109.04(F) factors, and every filing needs the Parenting Proceeding Affidavit confirming the children have lived in Ohio for the last six months under the UCCJEA. We build the factual record the court actually weighs instead of leaving it to a hearing-day pitch.
The county schedule and the class handled. Mercer applies one parenting-time schedule across both courts — alternating weekends, a weekday evening, alternating holidays, and five summer weeks — and in a divorce parents of minors must finish the $30 A-OK program. We set realistic time under that schedule and book the class so it doesn't delay the hearing.

When custody is contested either court can appoint a Guardian ad Litem on a $1,000 deposit to investigate and recommend, and Ohio frames the outcome as sole custody or shared parenting — not 'primary' or 'joint.' We prepare you for a GAL investigation and use Ohio's actual terms, all under a flat fee agreed before we begin and available on a payment plan.

Flat-fee options

Flat-fee limited scope: we draft and file the custody complaint or motion; you appear at any hearing.

Establish custody: $1,250
Modify custody: $1,450

Prefer full representation? An Ohio attorney can carry the entire case on a $3,500 retainer.

Split any flat fee with Gavvl Direct — our in-house plan at 19% APR, $500 minimum — on a 60%-down schedule of 18 weekly, 8 bi-weekly, or 4 monthly payments, or full financing where work begins once 60% is paid. Affirm, Klarna, and PayPal Pay Later are also available through LawPay.

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Ohio Custody by the Numbers

Best interest The single standard that governs every Ohio custody decision Source: Ohio Revised Code § 3109.04
No set age There is no age a child can choose a parent — the judge weighs a mature child's wishes Source: Ohio Revised Code § 3109.04(B)
Change in circumstances Required, plus a best-interest finding, before the residential parent can be changed Source: Ohio Revised Code § 3109.04(E)(1)
Shared parenting Either parent may ask the court for a joint parenting plan Source: Ohio Revised Code § 3109.04(G)

Compare Types of Custody in Ohio

Custody type	Who makes major decisions	Where the child lives	Best when
Shared parenting	Both parents jointly, under a written plan	Time is split per the plan (not always 50/50)	Parents can communicate and cooperate on decisions
Sole legal & residential	One parent	Primarily with that parent	One parent is unable or unwilling to co-parent
Split custody	Each parent for the child in their care	Siblings are divided between the two homes	Rare — only when it serves each child's best interest
Legal custody to a non-parent	The relative or caregiver granted custody	With the non-parent caregiver	Neither parent can safely care for the child

Where to File: Mercer County Court of Common Pleas — General Division (Clerk of Courts, Legal Division)

101 N Main St, Room 205, PO Box 28, Celina, OH 45822
Phone: (419) 586-6461
Hours: Monday 8:30 AM–5:00 PM; Tuesday–Friday 8:30 AM–4:00 PM
Website: Court website

Juvenile Branch (Never-Married Parents)

Mercer County Court of Common Pleas — Probate/Juvenile Division
101 N Main St, Suite 307, Celina, OH 45822
Phone: (419) 586-1249
Hours: Monday 8:30 AM–5:00 PM; Tuesday–Friday 8:30 AM–4:00 PM

Custody is the right path if…

A custody case is the right path in Mercer County if…

You need a court order setting who the children live with and how parenting time and decision-making are divided.
You and the other parent can't agree on parenting time, school enrollment, or major decisions.
You know which court applies — the General Division for married/divorcing parents, the Juvenile Court for never-married parents.
Ohio is the children's home state under the UCCJEA (they've lived in Ohio for the last 6 months).
In a divorce case, you can complete the A-OK Parenting Program before the final hearing.

Filing Fees

Custody inside a divorce/dissolution: part of the case deposit · Never-married custody in Juvenile Court: $200 deposit + $25 stenographer's fee · GAL deposit $1,000 (contested cases) · A-OK Parenting Program $30/person in DR cases. Confirm amounts with the Clerk (419-586-6461) or Juvenile Court (419-586-1249).

Forms & Filing Packets

Custody for never-married parents (Juvenile Court) — $200 deposit

Complaint for Allocation of Parental Rights & Responsibilities (Ohio SC Form 23) — Asks the Juvenile Branch to name a residential parent and legal custodian and set a parenting-time schedule when the parents were never married.
Parenting Proceeding Affidavit (UCCJEA · R.C. 3127.23) — Lists where each child has lived for the last 5 years and with whom, confirming Ohio's jurisdiction over custody under the UCCJEA. Required in any case involving minor children.
Ohio Child Support Computation Worksheet (2024 Income Shares) — Run the official Ohio Child Support Calculator, print, and sign. Required any time you ask the court to set or change support.
Mercer County Juvenile Court Forms — The Probate/Juvenile Division's own forms for never-married parents: Complaint for Parentage / Allocation of Parental Rights (Custody) / Parenting Time, parenting plans, motions to change custody or parenting time, motions for contempt with Show Cause Order, financial and health-insurance affidavits, the IV-D application, and the Grandparent Power of Attorney / Caretaker Authorization Affidavit.

Custody inside a divorce (General Division) — Part of the divorce/dissolution deposit

Parenting Proceeding / UCCJEA Affidavit (Ohio SC Affidavit 3) — Required in any case with minor children. Lists where each child has lived for the last 5 years, confirming Ohio's UCCJEA jurisdiction.
Ohio Child Support Computation Worksheet (2024 Income Shares) — Run the official Ohio Child Support Calculator, print, and sign. Required any time the court sets or changes support.
Standard Parenting Time Allocation (Mercer SO 2) — The General Division's default parenting-time schedule (revised November 2025): alternating weekends Friday 7 p.m.–Sunday 7 p.m., one weekday evening (5:30–8:30 p.m.), alternating holidays, Mother's/Father's Day and birthdays with the respective parent, and five weeks of uninterrupted summer time each. It applies unless the parents agree otherwise or the court orders a different schedule.
Notice to Attend the A-OK Parenting Program (Mercer DR 7) — Parents of minor children in a Mercer County divorce or dissolution must complete the A-OK Parenting Program ($30/person) before the final hearing (Common Pleas Loc.R. 21.02). The class runs the 4th Tuesday of January, March, May, July, September, and November, 6:00–9:00 p.m., in Room 303 of the courthouse; you are registered automatically when you file and the court mails your assigned date. Tip: If you can't attend your assigned date, call 419-586-2122 to reschedule — late arrivals are not admitted.

Add a Shared Parenting Plan

Shared Parenting Plan (Ohio SC Form 20) — Required when both parents are asking to be designated residential parents under R.C. 3109.04(G). Must be notarized.
Ohio Child Support Computation Worksheet (2024 Income Shares) — Run the official Ohio Child Support Calculator, print, and sign. Required any time the court sets or changes support.

How to File Custody in Mercer County

Pick the right court. Married or divorcing parents file in the General Division; never-married parents file in the Juvenile Court (Suite 307). Grandparent and other non-parent custody is always Juvenile.
Confirm Ohio is the home state. The children must generally have lived in Ohio for at least the prior 6 months (UCCJEA). The Parenting Proceeding Affidavit is how you swear to those facts.
Assemble and file your packet. Married parents: the divorce/dissolution packet plus the Parenting Proceeding Affidavit and a child-support worksheet (add a Shared Parenting Plan if you seek shared parenting). Never-married parents: a Complaint for Allocation of Parental Rights, the UCCJEA affidavit, and the worksheet, filed with the $200 Juvenile deposit.
Complete A-OK (DR cases) and attend the hearing. In a divorce, parents of minors must complete the $30 A-OK Parenting Program before the final hearing. The court holds a pretrial, then a merit hearing if the case doesn't settle, applying the R.C. 3109.04(F) best-interest factors.

Mercer County Practice Notes

Best-interest standard governs. R.C. 3109.04(F)(1) lists 10+ factors: each parent's wishes, the child's wishes (when of sufficient age), the child's interaction with parents/siblings, adjustment to home/school/community, mental and physical health of all involved, the parent more likely to facilitate court-approved parenting time, child support compliance, criminal history, residence outside Ohio, and any history of abuse.
Guardian ad Litem in contested cases. In a contested custody case, the court can appoint a Guardian ad Litem — a court-appointed attorney — to investigate and recommend a parenting plan in the child's best interest. The GAL does not represent the child's wishes; the GAL represents what is best for the child. GAL fees are typically allocated between the parents.
Two courts, two judges named Matthew. Mercer County splits family law between two courts in the same building. The Court of Common Pleas General Division (Judge Matthew K. Fox, Room 301) hears divorce, dissolution, legal separation, annulment, DR post-decree motions, and DVCPOs; cases are filed with the Clerk of Courts (Room 205). The combined Probate/Juvenile Division (Judge Matthew L. Gilmore, Suite 307) hears never-married parentage, custody, parenting time, and support. The same magistrate, Richard M. Delzeith, serves both courts.
One Standard Parenting Time schedule across both courts. The General Division's Standard Parenting Time Guidelines (SO 2, rev. 11/2025) and the Juvenile Division's Local Rule 7 schedule (Appendix B) are identical: alternating weekends Friday 7 p.m.–Sunday 7 p.m., one weekday evening (5:30–8:30 p.m.), alternating holidays, and five weeks of uninterrupted summer time each. A phase-in schedule applies where parent and child have little or no established relationship.

Frequently Asked Questions

We were never married — where do I file for custody in Mercer County?: In the combined Probate/Juvenile Division (Judge Matthew L. Gilmore) on the 3rd floor, Suite 307, 419-586-1249. Parentage, custody, parenting time, and support for never-married parents are Juvenile Court matters, not divorce-court matters.
What's the difference between sole custody and shared parenting in Mercer County?: Sole custody names one parent the residential parent and legal custodian; shared parenting makes both parents residential parents and legal custodians under a court-approved Shared Parenting Plan (R.C. 3109.04(G)). The plan must be filed at least 30 days before the hearing. Ohio doesn't use 'primary' or 'joint custody,' and shared parenting is about decision-making, not a 50/50 time split.
What is the standard parenting-time schedule in Mercer County?: The court's guidelines (DR Standing Order 2 and the identical Juvenile Local Rule 7): alternating weekends Friday 7 p.m. to Sunday 7 p.m., one weekday evening (5:30–8:30 p.m.), alternating holidays, Mother's/Father's Day and birthdays with the respective parent, and five weeks of uninterrupted summer time each. A phase-in schedule applies where there is little or no established relationship.
How much is a custody, parentage, or support case in Mercer County Juvenile Court?: $200 for a new custody, support, visitation, or paternity case (or to reactivate a closed one, or for a contempt motion) under the Juvenile Local Rules Appendix A (eff. 2026). A relocation notice is $50, and a GAL request requires a $1,000 deposit. Each new or reopened case also carries a $25 stenographer's fee.
When does Mercer County appoint a Guardian ad Litem, and what does it cost?: In a contested custody or parenting-time case, either court can appoint a GAL to investigate and recommend what is in the child's best interest. The GAL deposit is $1,000 in both courts (no deposit in Juvenile abuse/neglect/dependency or delinquency cases). A court-appointed Juvenile GAL may bill no more than $100/hour. GAL fees are typically allocated between the parties.

Free Local Resources in Mercer County

Mercer County Clerk of Courts — Legal Division (divorce, dissolution, legal separation, annulment, CPO). Clerk Calvin Freeman, 101 N. Main St., Room 205, PO Box 28, Celina, OH 45822; (419) 586-6461; fax (419) 586-5826; clerk@mercercountycourts.com. Files all Domestic Relations and civil cases and confirms current deposits (divorce, dissolution, and post-decree motions are each a $350 deposit eff. 4/1/2024). No personal checks — cash, money order, or cashier's check, or pay online via LexisNexis. Court staff cannot give legal advice. Confirm the current amount and any e-filing registration (Common Pleas Loc.R. 29) with the Clerk before filing.
Mercer County Court of Common Pleas — General Division (hears all Domestic Relations cases). Judge Matthew K. Fox, Magistrate Richard M. Delzeith, 101 N. Main St., Room 301, Celina, OH 45822; (419) 586-2122; cpc@mercercountycourts.com. Decides divorce, dissolution, legal separation, annulment, DR post-decree, and domestic-violence civil protection orders. There is no separate Domestic Relations court.
Mercer County Probate/Juvenile Division (never-married parents, non-parent custody). Judge Matthew L. Gilmore, Suite 307 (3rd floor), 101 N. Main St., Celina, OH 45822; juvenile line (419) 586-1249 or (419) 586-2418; fax (419) 586-4506; https://mercercountycourts.com/index.php. Handles parentage, custody, parenting time, and support for never-married parents, plus grandparent and other non-parent custody. New custody/support/visitation/paternity cases carry a $200 deposit (plus a $25 stenographer's fee); confirm current amounts with the court.
Mercer County Child Support Enforcement Agency (CSEA). 220 W. Livingston St., Room B181, PO Box 649, Celina, OH 45822-0649; (419) 586-7961; toll-free 800-207-3597; fax (419) 586-2151; hours M–F 8:30 AM–4:00 PM. Opens IV-D child-support cases, establishes paternity administratively, runs wage withholding, distributes payments, and enforces orders.
A-OK Parenting Program (required for divorce/dissolution with minor children). Mercer County requires each parent in a divorce or dissolution with minor children to attend the A-OK Parenting Program before the final hearing (Common Pleas Loc.R. 21.02). Cost is a one-time $30 per person, paid at the class; you are registered automatically when you file, and the court mails your assigned date. The program runs 6:00–9:00 PM on the 4th Tuesday of January, March, May, July, September, and November in Room 303 of the courthouse. Juvenile (never-married) cases are generally not ordered into A-OK. Call (419) 586-2122 to reschedule.
Ohio Legal Help & legal aid. Ohio Legal Help (https://www.ohiolegalhelp.org/) has plain-English guides and the Ohio Supreme Court standardized forms for divorce, custody, support, and protection orders. Legal Aid of Western Ohio (LAWO) serves Mercer County for income-eligible residents — confirm the current intake line.

Related to your custody case

Paternity & Custody — Establish parentage and build a parenting plan that protects your children.
Child Support — Calculate, establish, or modify support under Ohio's guidelines.
Post-Decree Modification — Update custody, support, or parenting orders after your case ends.

Related guides

In-depth, attorney-written guides on custody and related Ohio family law topics.

Ohio Child Custody Laws: What Every Parent Should Know — Ohio custody law turns on one principle: the best interest of the child. This guide explains sole custody, shared parenting, the statutory factors, and how courts decide.
Shared Parenting in Ohio: How Joint Custody Really Works — Shared parenting is Ohio's version of joint custody — both parents stay legal custodians and share major decisions. Here's what a plan must cover and how courts decide.
Fathers' Rights in Ohio: Custody, Paternity, and Parenting Time — Ohio law does not favor mothers over fathers — but unmarried fathers must establish paternity before they have any rights. Here's how fathers protect their relationship with their children.
Emergency Custody in Ohio: When and How to Get an Ex Parte Order — When a child faces immediate danger, Ohio courts can grant emergency custody on short notice through an ex parte order. Here's what qualifies and what happens next.