Mercer Vicinage (Vicinage 7), NJ Courts ↗county guide

Getting your deposit back in Mercer County, NJ: the courthouse, the boards, and who helps

You do not need a lawyer to sue for a deposit here. On the county's median rent, a full-deposit case lands in Small Claims at the Trenton courthouse - but that depends on your deposit, not the median, and the check below settles it. The rules behind it are the state's, not the county's: New Jersey law governs the deposit in all 12 municipalities, for the 54,545 households that rent here. What is local is everything around the rule: which courthouse hears the case, which towns keep a rent board, where the landlord is registered, and who will help for free.

Check my landlord's deadline - free →Build my case

← New Jersey deposit law, the rules themselves

Where you stand

Your deadline, your numbers, and why no Mercer County ordinance changes either.

Has your landlord missed the 30-day deadline?

Two fields, ten seconds - the math follows N.J.S.A. 46:8-21.1, the same statute in every Mercer County town. Add your deposit to see what you can demand and which Trenton track the doubled claim lands on.

The rules themselves: 30 days, doubled, one and a half months

These rules come from New Jersey state law, not from the county. We checked the published code of all 12 Mercer County municipalities against the state's 2026 survey: not one has a deposit ordinance of its own, so a landlord who tells you it works differently in Trenton, East Windsor or Ewing is wrong.

The Rent Security Deposit Act, N.J.S.A. 46:8-19 to 46:8-26, reads the same in every Mercer County town. The New Jersey page has the full text and the case law; this is the short version.

30 days: to return it after you move out
2x: what a court awards on money wrongfully kept
1.5 months: the most any NJ landlord may collect

The clock starts the day the tenancy ends - usually the day the keys go back - and runs 30 days, five business days if fire, flood or condemnation put you out. Miss it, or keep money without an itemized reason, and the court doubles what was withheld: "shall", not "may", with costs on top. The same doubling applies at the Trenton courthouse as anywhere in the state. The statute in full, the exemptions and the case law are on the New Jersey page.

What a deposit dispute looks like in Mercer County, in numbers

$1,623: median monthly rent
$2,435: the most a landlord may hold on it
54,545: renter households - 38% of the county

The median Mercer County renter pays $1,623 a month, so the deposit on a median unit tops out at $2,435 - one and a half months is the state cap. If a landlord keeps all of it past the 30 days, the claim is that amount doubled, $4,869, which stays under the $5,000 Small Claims line: a typical full-deposit case in this county is a Small Claims filing, on the short form with the $35 fee. Only a deposit above $2,500 doubles past it into the Special Civil Part.

Rent boards exist in 5 of the 12 municipalities

Rent control is the one landlord-tenant rule New Jersey towns set locally, and 5 towns in Mercer County keep a board. None of it touches deposits - the cap and the 30 days are the state's everywhere - but a board knows its local landlords, which is worth a call when a management company has gone quiet.

The 5 Mercer County boards, and the towns without one

Municipality	Covers	Annual limit	Board
East Windsor	4+/Apartment complexes	Determined by the "allowable base increase" formula, outlined in §13-4B.	Township of East Windsor (609) 443-4000
Ewing	buildings of 20 or more units	Average of the CPI increases for the 2 preceding one-year periods ending during the months of January and July, multiplied by 85%. CPI used is average of Philadelphia-NJ area and NY-Northeast NJ area.	Rent Control Board (609) 436-1200
Hamilton	buildings of 4 or more units	If landlord pays heat: Average of percentage increase of CPI and percentage increase of Residential Renters CPI released during July preceding notice of increase If tenant pays heat: 60% of figure previously mentioned CPI used: Urban wage earners and clerical workers, US city average.	Rent Leveling Commission (609) 890-3882
Lawrence	buildings of 10 or more units	Percentage change in CPI-W between preceding year and year prior to that.	Rent Stabilization Board (609) 844-7005
Trenton	every rental unit	4% no more than every 12 months, 2% for a senior citizen tenant or disabled tenant	Rent Stabilization Board (609) 989-3507

No rent control: Hightstown, Hopewell Borough, Hopewell Township, Pennington, Princeton, West Windsor. In those towns the rent is whatever the lease says, and the deposit is still capped at one and a half months of it.

One town had a board and dropped it: Robbinsville (Mobile home rent control ordinance repealed in 2020.). An older lease may still mention the ordinance; it no longer applies, and it never touched the deposit either way.

The courthouse, and how you file

The Trenton window, the form your claim needs, and what it costs here.

Where a Mercer County deposit case is filed

Deposit lawsuits go to the Special Civil Part of the Superior Court, which sits by county. You file in the county where the landlord lives or does business - not where you live - and if the landlord is out of state, in the county where the rental is. A Trenton tenant whose landlord runs the building from the next county over files there; a Trenton tenant with a Trenton landlord files here. The Special Civil Part window is in the Mercer County Civil Courthouse.

The courthouse: Mercer County Civil Courthouse
Special Civil Part (Small Claims Section)
175 South Broad Street, Trenton, NJ 08650
Phone and hours: 609-571-4200 ext. 76019
Mon - Fri: 8:30 a.m. - 4:30 p.m.
Small Claims Section: Claims up to $5,000. Filing fee $35, plus $5 for each additional defendant.
Special Civil Part: Claims up to $20,000. Filing fee $50 to $75.

The Trenton office in practice

Checked on September 4, 2026 against the court's own pages. Rooms, hours and phone extensions change without notice - confirm with the office before you rely on any line below.

Special Civil Part / Small Claims line - the courthouse number above: 609-571-4200 ext. 76019
Mediation and arbitration: 609-571-4200 ext. 74475

Free help inside the courthouse. The vicinage's Self-Help Resource Center - Mercer County Civil Courthouse, 175 South Broad Street, 2nd Floor, Trenton, NJ 08650-0068, 609-571-4200 ext. 74205, [email protected] - explains forms and procedure to people without a lawyer, Monday through Friday, 8:30 am to 4:30 pm. Staff cannot give legal advice, but they can tell you which form, which window, and what is missing from your file before you pay the fee.

Settling before the judge. On the hearing date the court sends both sides to a settlement conference first; many deposit cases end there with a payment plan.

Filing here: the Mercer County layer

The procedure is the state's - what is local is the window you hand it to. Filing to judgment in New Jersey, in four steps has the sequence, the exhibit stack and the hearing itself. Here is the Mercer County layer.

Before you file: Send the demand letter by certified mail first, citing N.J.S.A. 46:8-21.1 and the 30-day deadline, and give it 10 to 14 days. A judge will ask whether the landlord had a chance to pay, and the letter becomes your first exhibit.
Your form: Up to $5,000 it is the Small Claims kit; above that the Special Civil Part complaint. Enter your deposit in the check at the top and this page names your form.
Where to hand it in: The Special Civil Part window, 175 South Broad Street, Trenton, NJ 08650 - in person during court hours, by mail to the same address, or online through JEDS. One copy of the complaint per defendant.
What it costs here: $35, plus $5 for each additional defendant in Small Claims, $50 to $75 in the Special Civil Part. A fee waiver is available if you cannot afford it - ask the clerk for the form when you file.

The Trenton office at 609-571-4200 ext. 76019 can tell you the current wait - count on two to three months from filing to a hearing date in most vicinages.

The forms, from the court itself

How to sue for up to $5,000 in Small Claims - non-motor-vehicle kit · CN 10151
Special Civil Part complaint kit, with instructions · CN 10541
A Guide to Small Claims · CN 10290
Special Civil: A Guide to the Court · CN 10281
Judiciary Electronic Document Submission · JEDS

III

Looking things up, and getting help

The landlord's legal name and address, which of 12 Mercer County clerks holds it, and who helps for free.

Finding the landlord's mailing address

A demand letter needs an address, and the one on the lease is often a management office that has since moved. Under New Jersey's Landlord Identity Law your landlord had to register the owner's name and address - with the municipal clerk for one- and two-unit buildings, with the state for anything larger - and the clerk's copy is public. The lookup below has the clerk for every one of Mercer County's 12 municipalities. In Trenton the same information sits with the Trenton Absentee Owner Program, which registers every landlord who does not live at the property.

3 Mercer County cities run their own rental registries on top of the state filing - an inspection or licensing office that holds the current owner and managing agent for every registered rental. Where your building is in one of them, that office is usually quicker than the clerk.

Trenton · Absentee Owner Program (annual license for non-occupant owners of rented structures) (Division of Housing Inspections, Department of Housing & Economic Development, Trenton City Hall, 319 E State Street, Trenton NJ 08608) · 609-989-3563
Annual license (renewed each January) for every landlord who does not live on the premises; $90 per structure plus $25 per unit; registration is on a form provided by the Department of Inspections. Page states: if you are a tenant and want to know if your property is properly licensed, call 609-989-3563.
Hamilton Township · Landlord License and Rental Unit Registration (Chapter 222 / Residential Rental Unit Licensing) (Housing Inspection & Landlord Compliance Office, 2090 Greenwood Avenue, Room 302, Hamilton NJ 08609 (mail: P.O. Box 00150, Hamilton NJ 08650)) · 609-890-3665
Landlord Registration and License Application plus Rental Unit Registration for every rental unit; landlords living outside Mercer County must name a local Managing Agent residing in Mercer County who is authorized to accept tenant notices, issue receipts and accept service of process; annual certificate of liability insurance also on file. Not stated; FAQ says the Township handles only inspection and landlord-registration matters, not landlord/tenant disputes (contact the office at 609-890-3665 or via HAMStat).
Ewing Township · Annual Landlord Certificate of Registration (Ordinance 10-07) with Property Transfer Certificate on each tenancy change (Housing Division / Code Enforcement Office (Construction Office), 1666 Pennington Road (rear entrance), Ewing NJ 08618) · (609) 883-2900; Lisa Litz (housing/rental/property transfer) ext. 7677, [email protected]
Annual registration of all rental residential dwellings by January 31 ($50); each unit is inspected on every change in tenancy and a property transfer certificate must issue before the tenant moves in; the landlord must give each tenant a copy of the Certificate of Registration and file amendments within 20 days of any change.

Where the landlord's registration is filed: the municipal clerk

New Jersey's Landlord Identity Law makes every landlord file a registration statement - the owner's legal name and address, and the managing agent's - and for one- and two-unit buildings it is filed with the clerk of the municipality the rental is in (larger buildings register with the state Department of Community Affairs). The clerk's copy is a public record. Pick your town for the office that holds it.

Your town in Mercer County

All 12 municipal clerks in Mercer County

Municipality	Clerk's office	Phone
East Windsor Township	16 Lanning Blvd., East Windsor, NJ 08520	609-443-4000 x437
Ewing Township	2 Jake Garzio Dr., Ewing, NJ 08628	609-538-7609
Hamilton Township	2090 Greenwood Avenue, Hamilton, NJ 08650	609-890-3622 or 3624
Hightstown Borough	156 Bank Street, Hightstown, NJ 08520	609-490-5100 x772
Hopewell Borough	88 E. Broad St., Hopewell, NJ 08525	609-466-2636
Hopewell Township	201 Washington Crossing-Pennington Road, Titusville, NJ 08560-1410	609-737-0605 x6760
Lawrence Township	2207 Lawrenceville Rd., P.O. Box 6006, Lawrenceville, NJ 08648	609-844-7000
Pennington Borough	30 N. Main Street, Pennington, NJ 08534	609-737-0276
Princeton	400 Witherspoon St., Princeton, NJ 08540	609-924-5704
Robbinsville Township	2300 Route 33, Robbinsville, NJ 08691	609-259-3600 x1107 or x1108
City of Trenton	319 E. State Street, City Hall Room 208, Trenton, NJ 08608	609-989-3187
West Windsor Township	271 Clarksville Rd., P.O. Box 38, West Windsor, NJ 08550	609-799-2400 x213

List from the county's own directory, checked September 4, 2026.

Free help in Mercer County

Central Jersey Legal Services - Mercer County office · 609-695-6249
198 West State Street, Trenton, NJ 08608. Free civil legal help for lower-income residents, including tenant matters.
Volunteer Lawyers for Justice · 973-645-1955
Statewide pro bono program that helps tenants draft deposit demand letters and prepare pro se complaints against landlords who kept a deposit.
Legal Services of New Jersey hotline · 1-888-576-5529
Statewide intake line for free legal help, 1-888-LSNJ-LAW.
Trenton Absentee Owner Program · 609-989-3563
Registration for non-resident landlords - the city record of who owns and manages a Trenton rental, useful when you need a mailing address for the demand letter.

If it goes wrong

What losing costs, whether they can retaliate, and how a Mercer County judgment is actually collected.

Before you file: the three things people worry about

What if I lose?: You are out the filing fee and the time. You are the one suing, so losing leaves you where you started and puts no eviction on your record. What losing actually costs - and the one point most failed claims turn on - is on the New Jersey suing page.
Can the landlord retaliate?: After a move-out, barely - the tenancy is over and you are the plaintiff. If you still rent from them, New Jersey bars reprisals for exercising a legal right. The full answer is on the New Jersey suing page; in Mercer County the ombudsman at the Mercer County Civil Courthouse and Central Jersey Legal Services - Mercer County office both take the question in person, for free.
If I win, how do I get paid?: The court does not collect for you - a judgment is an instrument you enforce, and judgments against landlords are unusually collectable. Collecting your judgment walks through levy, garnishment and liens. The writ is issued by the Mercer Vicinage (Vicinage 7) clerk at the same Trenton window you filed at.

Build your case

The case builder runs on New Jersey law, which is exactly the law that applies here. It checks the 30-day deadline against your move-out date, grades each deduction, and writes the demand letter with the statute cited - the letter that becomes Exhibit A at the Trenton courthouse if it comes to that.

Build your case →

Sources

Court, board and legal-aid details checked on September 4, 2026. Phone numbers and fees change; confirm with the office before you rely on one. Not reviewed by a licensed attorney, and not legal advice.