Hamilton County Paternity Attorneys
Reviewed by Stephanie Green · Managing Partner & Co-Founder · Last updated June 11, 2026
Hamilton County, Ohio · Cincinnati
When parents were never married, establishing legal paternity is the first step before a court can order custody, parenting time, or child support. In Hamilton County, paternity is handled by the Juvenile Court. Either parent can start the case — the father files the Paternity — Father packet and the mother files the Paternity — Mother packet.
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Flat-fee and full-representation options: we handle the filings, the Hamilton County local forms, the court strategy, and the hearings — and you know the price before we start.
Start with a $25 consultation and talk through your options with an Ohio family-law attorney before you commit to anything. Get started online or see payment plans & financing.
How do I establish paternity in Hamilton County, Ohio?
File in the Hamilton County Juvenile Court (800 Broadway, clerk (513) 946-9431). The father files the 'Paternity — Father' packet; the mother files the 'Paternity — Mother' packet. The establishment fee is $115. Genetic testing may be ordered. Once paternity is established, either parent can ask the Juvenile Court for custody, a parenting-time schedule, or child support. If you need to undo an existing paternity finding, file the 'Petition to Set Aside Paternity' packet (Civ. R. 60(B), $100).
Put a flat-fee attorney on your Hamilton County paternity case
Until paternity is legally established, an unmarried father has no enforceable custody or parenting-time rights and the Juvenile Court cannot order support against him — so paternity is the gateway to everything else. In Hamilton County the case runs through the Juvenile Court at 800 Broadway, where the father files the Paternity — Father packet and the mother files the Paternity — Mother packet for a $115 establishment fee. Gavvl Law files the correct packet and then moves straight into custody or support in the same court, on a flat fee approved up front with payment plans available, or full representation if paternity is disputed.
- The right packet, filed to unlock custody and support. Either parent can open the case, but the packet differs: the father files the Paternity — Father packet and the mother files the Paternity — Mother packet, each with the $115 establishment fee. We file the correct one and line up your custody, parenting-time, or support request so the Juvenile Court can decide all of it in the same case instead of making you refile.
- Genetic testing and set-aside deadlines. The court can order genetic testing to confirm paternity, and undoing an existing determination is a Civ. R. 60(B) petition ($100) with strict deadlines and proof requirements. We confirm the current procedure with the Clerk at (513) 946-9431 before filing so a missed deadline doesn't cost you the right to contest paternity.
- Flat fee, financing, or the free Help Center. We quote one flat fee approved up front with payment plans available, and full representation if the other parent fights it. If money is tight, we point you to the Civil Fee Waiver for the $115 filing cost and the Hamilton County Help Center (800 Broadway, 1st Floor; (513) 946-9440), which offers free education on Juvenile paternity and support.
Paternity, custody, and support all live in the same Hamilton County Juvenile Court, so getting the parentage case right the first time is what lets you ask for a parenting schedule or a support order without starting over. We file at the 800 Broadway clerk's office before the 3:30 PM cutoff and keep your case on one track from establishment through the orders that follow.
Flat-fee options
Flat-fee limited scope: we draft and file the parentage complaint to establish legal paternity — adding custody and parenting time if you need it. You appear at any hearings yourself.
- Establish paternity (parentage complaint): $950
- Paternity with custody & parenting time: $1,350
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.
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: Hamilton County Court of Domestic Relations
800 BroadwayPhone: (513) 946-9150
Hours: Monday–Friday, 8:00 AM – 4:00 PM
Website: Court website
e-Filing: Online e-filing portal
Juvenile Branch (Never-Married Parents)
Hamilton County Juvenile Court
800 Broadway
Phone: (513) 946-9431
Hours: Monday–Friday, 8:00 AM – 4:00 PM
Paternity is the right path if…
- You were never married to the other parent and need to legally establish the father.
- You're a father who wants enforceable custody or parenting-time rights.
- You're a mother who needs a legal father in place before asking for support.
- You need paternity settled before filing for custody or child support.
- You believe an existing paternity finding is wrong and want to set it aside.
Paternity established and now you need custody or support? See custody.
Filing Fees
Establish paternity: $115 · Set aside paternity (60B): $100 · Foreign decree registration: $75 · fee waiver available · confirm current amounts with the Juvenile Clerk at (513) 946-9431
Forms & Filing Packets
Establish paternity — filed by the father — $115 (parent-child relationship)
- Paternity — Father (Complete Packet) — Juvenile Court packet for a man asking the court to establish that he is the legal father of a child.
Establish paternity — filed by the mother — $115 (parent-child relationship)
- Paternity — Mother (Complete Packet) — Juvenile Court packet for a mother asking the court to establish a child's legal father.
Set aside an existing paternity finding — $100 (motion to set aside, 60B)
Use when a man named as father later has grounds to undo that determination (Civ. R. 60(B)).
- Petition to Set Aside Paternity (Complete Packet) — Juvenile Court packet (Civ. R. 60(B)) to undo an existing paternity determination.
How to File Paternity in Hamilton County
- Choose your packet. The father files the Paternity — Father packet; the mother files the Paternity — Mother packet.
- Gather identity and birth information. Have the child's birth information and both parents' details ready; the court may order genetic testing.
- File at Juvenile Court. File at 800 Broadway, 1st Floor, by the 3:30 PM cutoff, and pay the $115 fee (or file a Civil Fee Waiver).
- Attend the hearing. After paternity is established, ask the court for custody, parenting time, or support in the same case.
Hamilton County Practice Notes
- Paternity is the gateway. Until paternity is legally established, an unmarried father has no enforceable custody or parenting-time rights and the court cannot order support against him. File paternity first, then custody/support follow in the same Juvenile Court.
- Free help for self-represented filers (Juvenile). The Hamilton County Help Center — a partnership with the University of Cincinnati College of Law — offers free education and limited legal advice on custody, companionship, parenting time, and support in Juvenile Court. It's at 800 Broadway, 1st Floor; (513) 946-9440. The Help Center attorney cannot represent you in court but can explain your options.
- Genetic testing and deadlines. The court can order genetic testing to confirm paternity. Setting aside an existing determination has strict deadlines and proof requirements (Civ. R. 60(B)), so confirm the current procedure with the Clerk at (513) 946-9431 before filing.
Frequently Asked Questions
- How do I establish paternity in Hamilton County, Ohio?
- Paternity is handled by the Hamilton County Juvenile Court. The father files the 'Paternity — Father' packet and the mother files the 'Paternity — Mother' packet; the establishment fee is $115. Filing legally identifies the child's father, which is the gateway to a custody, parenting-time, or child-support order. The Clerk's Office is at 800 Broadway, 1st Floor, (513) 946-9431.
- Why does paternity matter for custody and support?
- Until paternity is legally established, an unmarried father has no enforceable custody or parenting-time rights, and the court cannot order child support against him. Establishing paternity in Juvenile Court creates the legal parent-child relationship that lets either parent then ask for custody, a parenting-time schedule, or support. It also secures the child's rights to inheritance, benefits, and medical history.
- Can paternity be undone in Hamilton County?
- Sometimes. If a man was named as a child's father but later learns he is not the biological father, he can file the Juvenile Court 'Petition to Set Aside Paternity' packet (a Civ. R. 60(B) motion, $100). Strict deadlines and genetic-testing requirements apply, so confirm the current procedure with the Clerk at (513) 946-9431 and consider speaking with an attorney before filing.
Free Local Resources in Hamilton County
- Hamilton County Domestic Relations Self-Help Resources. Complete listing of all Domestic Relations forms, dissolution merit instructions (Form 9.0), the decree checklist, and the Accept/Reject/Resubmit e-filing guidance at hamiltoncountyohio.gov.
- Hamilton County Clerk of Courts E-Filing. Self-represented and represented parties can e-file Domestic Relations cases through the Clerk of Courts e-filing portal at courtclerk.org. Pro se registration is available; credit cards accepted with a convenience fee. Help line (513) 946-5612.
- Hamilton County Job & Family Services — Child Support (CSEA). Hamilton County's IV-D child-support agency. Opens cases, runs wage withholding, distributes payments, and enforces orders. File the IV-D Application (HC7076) when establishing or modifying support.
- Hamilton County Juvenile Court Help Center. A partnership with the UC College of Law offering low-income residents free education and limited legal advice on custody, parenting time, companionship, and support in Juvenile Court. 800 Broadway, 1st Floor; (513) 946-9440.
- Legal Aid Society of Greater Cincinnati. Free civil legal aid for low-income Hamilton County families, including help with custody, support, and domestic-violence protection orders.
Other Family-Law Topics in Hamilton County
- Hamilton County Divorce — Full filing guide for contested divorce in Hamilton DR.
- Hamilton County Dissolution — Both-parties-agree track with the Hamilton form system.
- Hamilton County Custody — Allocation of parental rights for married and never-married parents.
- Statewide Custody Overview — How Ohio custody works at a high level.
Related to your paternity case
- Child Support — Calculate, establish, or modify support under Ohio's guidelines.
- Grandparents' Rights — Seek visitation or custody when it serves the child's best interest.
- Post-Decree Modification — Update custody, support, or parenting orders after your case ends.
Related guides
In-depth, attorney-written guides on paternity and related Ohio family law topics.
- 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.
- 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.
- Child Support Calculation in Ohio: How the Formula Works — Ohio calculates child support with the income shares model, combining both parents' incomes to set a shared obligation. Here's how the formula works and what changes the bottom line.
Continue your Hamilton County research
- Ohio Paternity guide — Statewide overview of paternity in Ohio.
- Cincinnati family law — Local attorneys and courts serving the Cincinnati metro.
- Hamilton County family law guide — Court info, local filing notes, FAQs, and the downloadable Hamilton County guide.
- Meet Stephanie Green — Managing Partner & Co-Founder at Gavvl Law.
- Payment plans & financing — Flat fees with Gavvl Direct, Affirm, Klarna, or PayPal Pay Later.
Call (513) 643-1969 or email support@gavvl.com.
