Nassau & Suffolk Counties, New York Nassau grievance deadline March 31, 2027Nassau grievance deadline Mar 31
Long Island Property Tax
Assessments

Suffolk County property records search

There are 534,162 parcels in Suffolk County (454,863 residential) across 72 school districts and 10 towns. Below is a plain-English guide to where each type of Suffolk property record actually lives — and the fastest way to look one up.

Last verified 3 min read

Total Suffolk parcels
534,162
Residential parcels
454,863
School districts covered
72
Median home value
$606,780
2025 assessment roll
Start here

Look up any Suffolk parcel by address

Type a Suffolk address and we pull the parcel from the 2025 assessment roll, show the assessed value, school district, exemptions on file, and the estimated tax bill.

Search a Suffolk address

What “Suffolk property records” actually means

Suffolk County is bigger and more decentralized than Nassau. There’s no single county-wide assessor — each of the 10 towns (Babylon, Brookhaven, East Hampton, Huntington, Islip, Riverhead, Shelter Island, Smithtown, Southampton, and Southold) runs its own assessor’s office. So when people say “Suffolk property records,” they usually mean one of three things, each living in a different place:

  • Tax & assessment records — assessed value, school district, exemptions on file, current taxes. Maintained by each town’s assessor. This is what we show — pulled live from the 2025 county roll.
  • Deed & mortgage records — who owns the property, what they paid, who holds the mortgage, recorded liens. Maintained by the Suffolk County Clerk. Searchable online via their public records portal.
  • Parcel maps / tax map — the visual map showing parcel boundaries and the tax-map identifier (district-section-block-lot). Maintained by the Suffolk County Real Property Tax Service Agency (RPTSA).

Use our address search for the fastest path

For the 90% case — “I want to know what this property is assessed at, what school district it’s in, and roughly what it costs in property tax” — searching by address above is the fastest path. We pull from the same 2025 final assessment roll the town assessors use, plus we layer in the live tax rate for that school district and town and produce an estimated annual bill within ±10% for 454,863 residential parcels in the county.

If you need the deed, mortgage history, or a recorded lien check, you still have to go to the County Clerk’s online portal — those records aren’t in the assessment roll. We link out at the bottom of the page.

Suffolk towns — direct assessor links

Each town runs its own assessor. If you need a certified copy of an assessment record or want to file a grievance, go directly to your town:

Suffolk property records — FAQ

Is Suffolk County property search free?
Yes. The official Suffolk County Clerk records portal and our own parcel lookup above are both free. Some private aggregator sites charge for the same data — you don’t need them. The RPTSA tax map is also free to browse.
How do I find a property by owner name in Suffolk?
The Suffolk County Clerk’s Online Public Records Search lets you search recorded deeds by grantor or grantee name. Our calculator searches by address only — we don’t expose owner names directly, but the assessment roll behind it does include the name of record.
What’s a Suffolk tax map number (SBL)?
Suffolk uses a five-part identifier: District-Section-Block-Lot-(Sub). For example, 0200-123.00-04.00-001.000. The first 4 digits are the SWIS / school district code, the rest pinpoints the parcel on the assessor’s map. You’ll see this on every tax bill and in the RPTSA tax map system.
Why is my Suffolk property taxed at a fraction of its market value?
Most Suffolk towns assess at a low fraction (the Level of Assessment, or LOA) of full market value. Brookhaven, Islip, and Babylon all run around 0.5% LOA, meaning a $600,000 home is “assessed” at about $3,000. The tax rate is much higher per-$1,000 of assessed value to compensate. The actual tax bill ends up the same — it’s a Long Island accounting convention, not a discount.
How do I file a Suffolk grievance with this data?
Suffolk grievance day is the third Tuesday in May each year. Pull your assessment record from this site (or directly from your town assessor), then use our Suffolk grievance guide for the filing forms, evidence requirements, and timeline.

Sources and citations

Last verified October 7, 2026. Tax rules change; we re-check every page each quarter.

Educational content and estimates only, not legal, tax or financial advice. Verify with your county or town receiver, an attorney or a CPA before making financial decisions.