Free Nassau County Assessment Check

Are your property taxes too high?

Search your Nassau County property. We compare your assessment with similar nearby homes and separately screen recent market evidence—then explain what stands out in plain English.

No sign up requiredPlain-English resultFree to use

Search your Nassau County property

Start with the house number and street name. Add the town or ZIP if you want to narrow the results.

Your property Comparable sale

Conservative screening tool: This tool uses separate assessment-equity and market-sales screens rather than one formula. It does not use a speculative 2028/29 ARC multiplier. Comparable sales are shown as raw recorded sales and may require appraisal-style adjustments. This is not an appraisal or guarantee; ARC makes the final determination and official Nassau County records control.

What this tool tells you

The map is designed as a fast screening tool. It combines Nassau County parcel geometry, property inventory, nearby Class 1 assessment data and recorded-sale information. Assessment equity and recent market sales are treated as separate signals rather than forcing every property through one formula.

A higher neighborhood position can be a reason to investigate further—but a strong grievance depends on appropriate comparable sales, property characteristics, condition, and the rules ARC applies to the filing year.

Learn how comparable sales work →

Think your assessment deserves a closer look?

GrieveItNow researches, prepares, and files Nassau County property tax grievances for one flat $99 fee. We do not take a percentage of your savings.

Use the map for context. If you want us to do the full property review and filing work, start your grievance online.

Grieve Your Property Taxes Today — $99 →