Suffolk County Property Assessment, Tax Map and Deed Search
Find a Suffolk County parcel, identify its town, decode the 19-digit tax map number, review the town assessment roll, check current or delinquent taxes and locate recorded deeds, mortgages, liens and easements.
Suffolk County does not operate a Central Appraisal District. Property assessments and exemptions are handled by the ten towns and some villages, while the county maintains the official tax map and land-record systems.
Start With the Suffolk County Property Service You Need
Suffolk County property information is divided among town, county and state offices. Select the task that matches your question before entering an address or paying for a document.
Check assessed value
Use the assessment roll or property-information system maintained by the town or independently assessing village where the parcel is located.
Find a parcel or DSBL
Use the county Real Property Tax Map Viewer to locate the parcel and identify its district, section, block and lot.
Open tax map viewer →Check current taxes
Search and pay through the Receiver of Taxes for the town in which the property is assessed.
Find town tax receiver →Check delinquent taxes
After May 31, unpaid taxes become a Suffolk County Comptroller matter rather than a town-receiver matter.
Open delinquent payment options →Search a deed or mortgage
Use the Suffolk County Clerk Land Records Database to search by address, tax map ID, owner, liber and page or index number.
Open Clerk land records →Challenge an assessment
File Form RP-524 with the town or village Board of Assessment Review by the applicable Grievance Day deadline.
Download Form RP-524 →Find Your Suffolk County Town Assessor and Tax Receiver
The assessor maintains the assessment roll and processes local exemptions. The receiver collects current taxes through May 31. Use the phone numbers below when the town website cannot match an address or tax map number.
| Town | Assessor contact | Assessor address | Tax Receiver contact |
|---|---|---|---|
| Babylon | (631) 957-3014 | 200 East Sunrise Highway, Lindenhurst, NY 11757 | (631) 957-3001 |
| Brookhaven | (631) 451-6300 | 1 Independence Hill, Farmingville, NY 11738 | (631) 451-9009 |
| East Hampton | (631) 324-4187 | 300 Pantigo Place, East Hampton, NY 11937 | (631) 324-4141, extension 2311 |
| Huntington | (631) 351-3226 | 100 Main Street, Huntington, NY 11743 | (631) 351-3217 |
| Islip | (631) 224-5585 | 40 Nassau Avenue, Islip, NY 11751 | (631) 224-5580 |
| Riverhead | (631) 727-3200 | 200 Howell Avenue, Riverhead, NY 11901 | (631) 727-3200 |
| Shelter Island | (631) 749-1080 | 44 North Ferry Road, Shelter Island, NY 11964 | (631) 349-3378 |
| Smithtown | (631) 360-7560 | 40 Maple Avenue, Smithtown, NY 11787 | (631) 360-7610 |
| Southampton | (631) 283-6020 | 116 Hampton Road, Southampton, NY 11968 | (631) 283-6514 |
| Southold | (631) 765-1937 | 53095 Route 25, Southold, NY 11971 | (631) 765-1803 |
How to Search Suffolk County Property Assessment Records
Search by address when
You are checking a home, commercial building or parcel with a reliable street location. Condominiums and vacant parcels may be easier to find by tax map number.
Search by owner when
You need multiple parcels associated with a person, estate, trust or company. Try the surname or distinctive company word first.
Search by DSBL when
You have a tax bill, deed, mortgage, title report, survey or county record showing the District, Section, Block and Lot.
Call the assessor when
The parcel is new, recently split, a condominium, inside a village, missing a normal address or listed under a prior owner.
How to Read a Suffolk County Tax Map Number
The Suffolk County Tax Map number is also called the SCTM, DSBL or Property Tax Map ID. It identifies the parcel through four parts.
District 0200 identifies Brookhaven; the remaining digits identify section, block and lot. A printed bill may display decimal points, such as section 001.00, block 01.00 and lot 001.000.
How to Use the Suffolk County Real Property Tax Map Viewer
Suffolk County Real Property Tax Service Agency is the sole authority responsible for maintaining the official county tax map for property-tax purposes.
What Suffolk County Property Record Fields Mean
| Field | Meaning | What to check |
|---|---|---|
| Tax map ID / DSBL | The county parcel identifier made from district, section, block and lot. | Use it to connect the assessment roll, tax bill, map and County Clerk record. |
| Owner | The ownership name carried on the local assessment roll. | A recent deed may not yet be reflected. Verify legal ownership through the County Clerk. |
| Property class | A New York property-type code describing residential, commercial, vacant, agricultural or other use. | Confirm that the class matches the property’s actual use and improvements. |
| Assessed value | The value placed on the assessment roll at the town’s level of assessment. | Do not assume it equals current market value or the tax bill. |
| Full market value | An estimated full value derived from assessed value and the municipality’s assessment ratio. | Review the roll year and calculation method before comparing it with a sale price. |
| Exempt amount | The portion removed from taxation under an approved exemption. | Different exemptions may apply to school, county, town or special-district taxes differently. |
| Taxable assessed value | The assessed value remaining after an applicable exemption. | The taxable amount may differ among taxing jurisdictions. |
| School district | The school district connected to the parcel for tax purposes. | Confirm the district before estimating school taxes or STAR savings. |
| Lot size or acreage | The parcel area carried by the assessment and mapping systems. | Compare it with the deed and survey when size affects value or development. |
| Building data | Local property inventory such as use, living area, age, construction and improvements. | Report obvious errors to the town assessor before the grievance deadline. |
| Tentative roll | The preliminary annual assessment roll available for review and grievance. | File Form RP-524 by the applicable Grievance Day if a reduction is requested. |
| Final roll | The roll completed after Board of Assessment Review decisions. | Use it to calculate the SCAR deadline and confirm the final assessment. |
Town Assessor vs County Real Property vs Clerk vs Comptroller
| Your question | Correct office | Why |
|---|---|---|
| What is my assessed value? | Town or village assessor | Local assessors prepare and maintain the assessment roll. |
| Why is the building description or property class wrong? | Town or village assessor | The local assessor maintains property inventory and classification data. |
| Where do I file a senior, veteran or local exemption? | Town or village assessor | The assessor reviews local exemption eligibility. |
| Where do I file an assessment grievance? | Town or village Board of Assessment Review | Form RP-524 is filed in the assessing municipality, not with a county CAD. |
| Who maintains the official county tax map? | Suffolk County Real Property Tax Service Agency | The Tax Map Division creates, changes and maintains the official parcel map. |
| Who assigns a new tax map number after a parcel split? | County Real Property, after local review | Applications generally begin with the town or village assessor and planning or building offices. |
| Where do I pay current taxes? | Town Receiver of Taxes | Town receivers collect current taxes from December through May 31. |
| Where do I pay after May 31? | Suffolk County Comptroller | Unpaid taxes become delinquent and transfer to the county on June 1. |
| Who records deeds, mortgages and liens? | Suffolk County Clerk | The Clerk maintains the official land-record database. |
| What can I do after the BAR denies my grievance? | SCAR or tax-certiorari review | Eligible owners may seek court review after completing the administrative grievance process. |
How to Check and Pay Suffolk County Property Taxes
330 Center Drive, Riverhead, NY 11901
Phone: (631) 852-3000
In-person payment hours listed by the county: Monday–Friday, 9:00 a.m.–4:15 p.m.
Suffolk County STAR, Senior, Veteran and Disability Benefits
New York uses two different application routes. STAR credit registration is handled by the New York State Tax Department, while most local exemptions are filed with the town or village assessor.
| Benefit | Where to apply | Important 2026 rule |
|---|---|---|
| Basic STAR credit | New York State Tax Department | For an owner-occupied primary residence; the STAR credit income limit is $500,000. |
| Enhanced STAR | New York State for STAR credit recipients | At least one resident owner must generally be age 65 by December 31; the 2026 benefit income limit is $110,750. |
| Existing STAR exemption | Maintained through state and local records | The exemption program is closed to new applicants; existing qualifying recipients may continue. |
| Senior-citizen exemption | Town or village assessor | Income limits and participating taxing jurisdictions vary locally. |
| Veterans exemption | Town or village assessor | Prepare military discharge, service and disability documentation as applicable. |
| Persons with disabilities and limited incomes | Town or village assessor | Local adoption and income limits determine the available reduction. |
| Agricultural assessment | Town or village assessor | File the state agricultural form and required soil, acreage, income or land-use evidence. |
| Clergy, nonprofit or other exemption | Town or village assessor | Eligibility depends on property ownership, use and the applicable New York statute. |
New homeowner STAR route
- Confirm the home is your primary residence.
- Register for the STAR credit with New York State.
- Do not file as a new STAR-exemption applicant.
- Keep the registration confirmation.
- Update the state if ownership or residence changes.
Local exemption route
- Identify the town or village assessor.
- Ask which taxing jurisdictions adopted the exemption.
- Check the March 1 taxable-status deadline.
- Attach complete income, age, service or disability proof.
- Save a complete copy and delivery evidence.
How to Grieve a Suffolk County Property Assessment
Helpful grievance evidence
- Recent arm’s-length purchase documents.
- Independent appraisal near the valuation date.
- Comparable sales in the same market.
- Photos showing damage or inferior condition.
- Contractor estimates and inspection reports.
- Proof of incorrect lot or building data.
Weak evidence by itself
- The tax bill is high.
- The owner cannot afford the tax.
- A mortgage balance.
- An undated automated website estimate.
- A neighbor’s tax bill without assessment analysis.
- A requested reduction with no calculation.
How to Search Suffolk County Deeds, Mortgages and Liens
The County Clerk’s Land Records Database contains recorded and imaged land records from 1987 to the present. Older records and full document viewing may require additional search steps, a subscription or a copy request.
What to Verify Before Buying Suffolk County Property
Assessment review
- Confirm the assessing town and village.
- Review assessed and full market value.
- Check property class and exemptions.
- Review lot and building inventory.
- Confirm the final assessment-roll year.
Tax review
- Check both current installments.
- Search for delinquent taxes after May 31.
- Identify school and special districts.
- Do not assume the seller’s STAR benefit transfers.
- Review escrow and closing adjustments.
Title and land review
- Match the deed to the DSBL.
- Review mortgages, liens and easements.
- Obtain a current survey when necessary.
- Check village and town land-use records.
- Investigate separate lots and development rights.
Fix Common Suffolk County Property Search Problems
| Problem | Likely cause | Best next step |
|---|---|---|
| No countywide appraisal result | Suffolk County assessments are maintained by towns and some villages, not one CAD. | Identify the town and open its assessor or assessment-roll search. |
| Address appears in the wrong town | The postal city or hamlet crosses municipal boundaries. | Use the DSBL district code and county tax-map viewer. |
| Owner name is outdated | The deed was recently recorded or the assessment roll has not been updated. | Verify the deed with the County Clerk, then contact the assessor. |
| Condominium not found by address | The Clerk’s system may require the exact tax map ID for a condominium unit. | Obtain the DSBL from the assessor, tax bill or title documents. |
| Tax map number is rejected | Leading zeros or fixed-length sections were removed. | Enter four district digits, five section digits, four block digits and six lot digits. |
| Current tax portal shows no balance | The tax may have transferred to the County Comptroller after May 31. | Search the county delinquent-tax system or call (631) 852-3000. |
| STAR is missing | Registration, ownership, residency or income verification may be incomplete. | Check the New York State STAR account and contact the assessor if an existing exemption is involved. |
| Grievance deadline has passed | The RP-524 complaint was not filed by Grievance Day. | Ask the assessor about correction-of-error options and obtain legal advice about any remaining remedy. |
| Map boundary looks incorrect | The GIS parcel line is not a survey or a recent split is still processing. | Compare the map with the deed, filed map, survey and county verification record. |
| Document image is unavailable | The record is older, access requires a subscription or the document is maintained elsewhere. | Use the Clerk’s copy instructions or call (631) 852-2000. |
Suffolk County Real Property, Clerk and Comptroller Offices
Real Property Tax Service Agency
300 Center DriveRiverhead, NY 11901
Phone: (631) 852-1550
Fax: (631) 852-3470
Handles: official tax maps, parcel verification, tax-map products and support for local assessing units.
Suffolk County Clerk
310 Center DriveRiverhead, NY 11901
Phone: (631) 852-2000
Handles: deeds, mortgages, liens, easements, filed maps, certified copies and SCAR court filings.
Suffolk County Comptroller
330 Center DriveRiverhead, NY 11901
Phone: (631) 852-3000
Office hours: Monday–Friday, 9:00 a.m.–5:00 p.m.
Payment hours: Monday–Friday, 9:00 a.m.–4:15 p.m.
Complete Your Suffolk County Property Search Correctly
For assessment research
- Identify the town and any assessing village.
- Find the DSBL on the tax bill or county map.
- Open the town assessment roll.
- Confirm the roll year and property class.
- Review assessed value and exemptions.
- Save a dated copy.
For tax or ownership research
- Use the town receiver through May 31.
- Use the County Comptroller beginning June 1.
- Match every payment to the correct DSBL.
- Search the County Clerk for recorded deeds.
- Review liens, mortgages and easements.
- Keep receipts and document copies.
Suffolk County Property Search Frequently Asked Questions
1. Does Suffolk County have a Central Appraisal District?
2. How do I search a Suffolk County property by address?
3. What is a Suffolk County DSBL or tax map number?
4. Who determines my Suffolk County assessed value?
5. When is Suffolk County Grievance Day?
6. What can I do after the Board of Assessment Review denies my grievance?
7. Where do I pay current Suffolk County property taxes?
8. Where do I pay delinquent Suffolk County property taxes?
9. How do new Suffolk County homeowners apply for STAR?
10. Where can I verify a Suffolk County deed or legal owner?
Estimate Taxes, Exemptions, Escrow, Protest Savings and Next Steps
This sitewide tool helps homeowners, buyers, sellers and investors understand property tax numbers before they check the official county appraisal district or tax office. It runs in your browser, does not collect personal data and gives practical next steps after each calculation.
What are you trying to do today?
Choose your main goal. The tool will guide you to the right calculation or next step.
Use Tax, Exemption and Protest tabs to understand your appraisal notice and possible savings.
Use Buyer Budget and Monthly Escrow before relying only on a mortgage payment estimate.
Property Tax Estimate Calculator
Estimate annual tax using property value, assessment ratio, exemptions and local tax rate.
Homestead and Exemption Savings
Estimate how much a homestead, senior, disabled, veteran or local exemption may reduce annual tax.
Monthly Escrow / Ownership Cost
Estimate monthly property tax, insurance, HOA and reserve cushion. Useful for buyers and homeowners comparing affordability.
Property Tax Protest Savings
Estimate possible savings if your appraised value is reduced after a protest, evidence review or correction.
Appraised Value Growth / Cap Impact
Estimate how a value increase or appraisal cap may affect taxable value. Rules vary by state, county and exemption status.
Home Buyer Monthly Budget Estimate
Estimate a more realistic monthly ownership cost by adding mortgage, property tax, insurance and HOA.
Find Official County CAD and Tax Resources
Enter county and state to create safe search links. This avoids guessing official URLs and helps users find the correct county appraisal district, property search, tax payment and exemption pages.
Why this tool helps your site
It gives visitors an interactive reason to stay on the page, calculate their own numbers and move from general reading to practical action.
Best placement
- Below county CAD articles
- Before FAQ section on long posts
- Inside sidebar or after first major section on desktop
Estimate disclaimer
Values are educational estimates. Visitors should confirm final values, exemptions, tax rates, payment status and deadlines with official county resources.