Butler County Paternity Attorneys

Reviewed by Stephanie Green · Managing Partner & Co-Founder · Last updated June 4, 2026

Butler County, Ohio · Hamilton

Paternity establishes a child's legal father, which unlocks custody, parenting time, child support, and benefits. In Butler County, parentage cases are filed at the Juvenile Justice Center, 280 N. Fair Ave., Hamilton. Paternity can be established by a signed Acknowledgment of Paternity, an administrative CSEA finding, or a juvenile-court order with genetic testing.

Hire Gavvl for your Butler County paternity case

Flat-fee and full-representation options: we handle the filings, the Butler 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 Butler County, Ohio?

File a Complaint to Establish Parentage at the Butler County Juvenile Justice Center, 280 N. Fair Ave., Hamilton, for $165 plus service. Include the IV-D application (Appendix H), the Face Sheet, and relief codes in the caption. The court can order genetic testing through a certified lab; the parentage case conference is set no earlier than 31 days after filing. Once paternity is established, the same case can allocate custody and set child support. A signed Acknowledgment of Paternity can be rescinded within 60 days.

Butler County paternity, established the right way with Gavvl Law

Establishing a legal father unlocks custody, parenting time, support, and benefits, and in Butler County parentage cases are filed at the Juvenile Justice Center, 280 N. Fair Avenue, for $165 plus service. The court can order genetic testing through a certified lab, and the parentage conference is set no earlier than thirty-one days after filing. Gavvl Law files the Complaint to Establish Parentage with the IV-D application, Face Sheet, and relief codes, and quotes a flat fee whether the case is agreed or contested.

Every attachment the Juvenile Court requires. Butler County Juvenile Court wants a separate filing for each child, plus the Juvenile Court Face Sheet, the relief codes in the caption, and a IV-D application on parentage and support cases. We assemble the full packet so the clerk accepts it rather than bouncing it back.
Genetic testing and the thirty-one-day conference. Either party can request genetic testing, and the court orders the parties and child to a designated certified lab. We prepare for the parentage conference the court sets no sooner than thirty-one days out, and if the alleged father is excluded the case is dismissed and the birth record corrected.
The sixty-day acknowledgment window. A signed Acknowledgment of Paternity can be rescinded within sixty days through CSEA; after that it takes a court challenge within a year on fraud, duress, or material mistake under R.C. 3111.27. We tell you which path still applies before the window closes.

Once parentage is established, the same Juvenile Justice Center case can allocate custody and set support, so we build the file to carry all three from the start rather than filing three times. A flat fee means the cost of establishing fatherhood at 280 N. Fair Avenue is settled before we begin.

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.

Start your paternity case or see payment plans & financing.

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: Butler County Court of Common Pleas, Domestic Relations Division

Gov't Services Center, 315 High Street, 2nd Floor, Hamilton, OH 45011
Phone: (513) 887-3100
Hours: Monday–Friday, 8:30 a.m.–4:30 p.m. (closed for lunch 12:00 p.m.–1:00 p.m.)
Website: Court website
e-Filing: Online e-filing portal

Juvenile Branch (Never-Married Parents)

Butler County Juvenile Justice Center
280 N. Fair Ave., Hamilton, OH 45011
Phone: (513) 887-3317
Hours: Monday–Friday, 8:00 a.m.–4:30 p.m. (Clerk 8:30 a.m.–4:30 p.m.)

Paternity is the right path if…

The parents were not married when the child was born.
You need to legally establish (or challenge) who the father is.
You want custody, parenting time, or child support that depends on legal fatherhood.
You need genetic testing to confirm parentage.

Filing Fees

Parentage/support complaint: $165 + service · Genetic testing ordered through a certified lab · Parentage conference no earlier than 31 days after filing

Forms & Filing Packets

Parentage complaint at the Juvenile Justice Center — $165 + service

Filed at 280 N. Fair Ave. to legally establish a father and, typically, set custody and support.

Complaint to Establish Parentage / Paternity — Opens a parentage case at the Butler County Juvenile Branch under R.C. 3111, asking the court to legally declare a father and (typically) allocate parental rights and set child support.
Parenting Proceeding Affidavit (UCCJEA · R.C. 3127.23) — Lists where each child has lived for the last 5 years and with whom. Confirms Ohio's jurisdiction over custody.
IV-D Application for Child Support Services — Opens your case with Butler County CSEA so support can be collected, tracked, and enforced through wage withholding.

Add custody and support once parentage is established

After parentage is established, the same juvenile case can allocate custody and set child support.

Complaint for Custody (Juvenile) — Asks the Juvenile Justice Center to designate a residential parent and legal custodian once paternity is established. One child per filing.
Ohio Child Support Computation Worksheet — Run the official Ohio 2024 Income Shares calculator, print, and sign. Required any time you're asking the court to set support.

How to File Paternity in Butler County

Decide how to establish paternity. Use a signed Acknowledgment of Paternity, an administrative CSEA finding, or file a parentage complaint at the Juvenile Justice Center for a court order.
File the parentage complaint. File at 280 N. Fair Ave. for $165 plus service, with the IV-D application, Face Sheet, and relief codes. One child per filing.
Complete genetic testing if disputed. The court can order the parties and child to a certified lab. Results are returned to Case Management/the court.
Add custody and support. Once parentage is established, the same case can designate a residential parent and set child support using the Ohio worksheet.

Butler County Practice Notes

Genetic testing. Either party can request genetic testing. The court (or CSEA) will order the parties and child to a designated lab. Tests run 99%+ accurate. If the alleged father is excluded, the case is dismissed and the Ohio Department of Health updates the birth record.
Acknowledgment of Paternity has a 60-day window. A signed Acknowledgment of Paternity can be rescinded within 60 days through CSEA; after that, you must challenge it in court within one year on grounds of fraud, duress, or material mistake of fact (R.C. 3111.27).
One child per filing with the Face Sheet. Butler County Juvenile Court requires a separate filing for each child, plus the Juvenile Court Face Sheet (Appendix I), relief codes (Appendix J), and a IV-D application for parentage and support cases.

Frequently Asked Questions

Do I file in Domestic Relations or the Juvenile Justice Center?: If you are married to the other parent (or were married when the children were born), custody, parenting time, and child support travel with your divorce, dissolution, legal separation, or annulment at the Domestic Relations Court, 315 High Street, Hamilton. If you were never married, paternity and custody go to the Butler County Juvenile Justice Center at 280 N. Fair Ave., a separate building. Grandparent and non-parent custody is always Juvenile.
How much does it cost to file in Butler County?: Domestic Relations filing deposits are set by the Butler County Clerk of Courts and posted at clerkofcourts.bcohio.gov; you pay them after the Case Management Office approves your packet. Juvenile Justice Center filings are $165 plus $50 clerk service for a custody, support, allocation, or visitation complaint ($165 plus service for paternity; $45 for a relocation notice). If you cannot pay, file Form DR824 to proceed in forma pauperis at DR, or an indigency affidavit at Juvenile.
Can I rescind an Acknowledgment of Paternity in Ohio?: A signed Acknowledgment of Paternity can be rescinded within 60 days of the last signature by contacting your local Child Support Enforcement Agency and completing a Request for Paternity Determination. After 60 days you must challenge the acknowledgment in court within 1 year on grounds of fraud, duress, or material mistake of fact (R.C. 3111.27). Genetic testing is typically ordered, and the Ohio Department of Health updates the birth record if the alleged father is excluded.
What does Butler County CSEA do?: The Butler County Child Support Enforcement Agency at the Gov't Services Center, 315 High Street, 7th Floor, Hamilton (health-insurance line (513) 887-3362) opens IV-D cases, runs the Ohio child-support calculation, collects support by wage withholding, distributes it, and enforces orders. Pay in person by Visa, MasterCard, ATM, or cash (no personal checks), by mail through Ohio Child Support Payment Central in Columbus, or online via ExpertPay.
What does it mean for Ohio to be my child's 'home state' under the UCCJEA?: Under the UCCJEA (R.C. 3127), Ohio is the children's home state when they have lived in Ohio with a parent for at least 6 consecutive months immediately before the filing. If the children recently moved, the prior state may still have jurisdiction. Ohio courts can also decline jurisdiction as an inconvenient forum under R.C. 3127.21 even when home-state requirements are met.

Free Local Resources in Butler County

Butler County DR Court Forms & E-Submission. All Domestic Relations forms, instructions, and completed packets are posted at drcourt.bcohio.gov/forms. Non-DV documents are submitted through the E-Submission portal at drcsubmit.bcohio.gov; DV/CPO documents use the Document Submission portal.
Butler County Juvenile Justice Center Forms. Custody, visitation, support, contempt, and emergency-custody complaints and motions (PDF and DOC) are at juvenilejusticecenter.bcohio.gov/forms___downloads. CSEA e-filing is at bcjjcefile.bcohio.gov/EFile.
Butler County Bar Association. Attorney referral and general legal information at (513) 896-6671 / butlercountybar.org. Court staff cannot give legal advice.
Women Helping Women (24-hour DV hotline). Confidential domestic-violence support and victim advocacy at (513) 381-5610. The Butler County Sheriff's Victim Assistance Program is at (513) 887-3430.

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.

More Butler County family-law resources

Ohio Paternity guide — Statewide overview of paternity in Ohio.
Cincinnati family law — Local attorneys and courts serving the Cincinnati metro.
Butler County family law guide — Court info, local filing notes, FAQs, and the downloadable Butler 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.