Real Estate API Questions

Where can I find property tax values and county assessment data?

Quick Answer

Property tax and assessed values originate from county tax assessor offices across 3,100+ U.S. counties. Realie normalizes total assessed value, land value, building value, tax year, and tax amounts into a single queryable JSON schema accessible via REST API, CLI, and MCP server.

Summary

County assessors calculate property tax values to establish local tax bills. These values are split between land value and improvement/building value and updated on local assessment cycles. Realie captures and standardizes current county tax assessments across all 50 states, allowing developers to query tax values alongside parcel boundaries, ownership, and sale records.

Assessed value vs. market value

Assessed value is the dollar figure established by a county assessor for calculating annual property taxes. It frequently differs from market value due to statutory assessment ratios, tax caps, or infrequent re-assessment cycles.

Realie reports the total assessed value alongside the land value split, building value split, tax year, and total tax amount as published by the county tax roll.

Querying tax data in product workflows

Tax fields are included in all standard property lookup endpoints (`/api/public/property/parcelId`, `/api/public/property/address`, `/api/public/property/search`).

Developers can query tax attributes for single parcels or filter across entire counties to identify specific valuation thresholds.

Frequently asked questions

What tax fields are returned in the property API?
Payloads return totalAssessedValue, totalLandValue, totalBuildingValue, totalMarketValue, taxValue, taxYear, and assessedYear.
Are tax assessments updated annually?
Tax assessment cycles depend on county rules — some counties reassess annually, while others operate on multi-year reassessment schedules.