Who this is for.
Consultants and in-house tax teams reviewing assessment notices and assembling appeal evidence across counties.
An appeal is an argument about one number. What turns it into an argument is the years on either side of that number, and whether the county published them.
What the argument is built from.
- What has the county carried this parcel at, year over year?
- What does the parcel record say about the lot and the improvement?
- Which site conditions argue that the carried value is too high?
- What does the county itself require for this exemption or this filing?
What answers those questions.
Nobody maintains this roster by hand. Each block claims a kind of source, the directory fills it at build time, and a source connected next month appears here on the build after that.
Assessment history and county requirements
Year by year values wherever a county publishes them, and the county rules behind a filing.
Texas County Exemption Rules
Texas agricultural and wildlife exemption rules, appraisal district contacts, and productivity values for all 254 counties.
Texas Appraisal History
Search all 252 Texas counties by address, owner, legal description, or map point, screen rural land by acreage and owner type, and read full appraisal and exemption history.
US Public Assessments
Search official public assessment records across selected states and major cities, with up to three years where the publisher provides them.
Conditions that argue against a value
Flood, wildfire, soils, access, and the environmental record read at the parcel.
US Census Address & Geography
Match a US address and return its Census state, county, tract, block, and metro identifiers.
Census Housing & Business Context
Housing estimates plus county establishment, employment, and payroll context.
EPA Regulated Facilities
US regulated facilities, permits, inspections, compliance, and enforcement history from EPA ECHO.
USFWS Critical Habitat
Final and proposed federal critical-habitat areas by species or US property location.
USGS Protected Areas & Public Lands
Nationwide protected-area and public-land ownership, management, access, and conservation context.
US Forest Service Boundaries
Check one point against the current source-specific Forest Service Basic Ownership layer.
NLCD 2021 Point Land Cover
Sample one lower-48 point from the verified 30 m MRLC NLCD 2021 WMS layer.
US Municipal Open Data Discovery
Find local property datasets or search normalized permit, inspection, and violation events in five US markets.
Data.gov Catalog Discovery
Search federal catalog metadata without fetching the linked datasets.
HUD Rents, Income Limits & ZIP Crosswalks
Official Fair Market Rents, housing-program income limits, and ZIP-to-Census crosswalk ratios.
FHFA Housing Finance Context
Quarterly state and metro home price trends plus county conforming loan limits.
USDA Agricultural Land Values
Official agricultural land asset-value statistics for one state or county and year.
FEMA Flood Zones
Flood hazard maps from FEMA, for an early check on a US property.
US Wetlands
Wetland maps from the US Fish and Wildlife Service, for checking land and property.
USDA Soils
Soil survey data from the USDA for land, building, farming, and pre-purchase research.
USGS Elevation
Ground elevation for US properties and land, from the US Geological Survey.
OpenFEMA Property Risk
Declared disasters, flood insurance claim patterns, and public aid data for US market research.
USGS Water Observations
USGS streamflow, stage, site, daily-value, water-quality, and groundwater observations.
EPA TRI Facilities
Direct, bounded lookup of facilities in EPA’s Toxics Release Inventory.
EPA Facility Registry
EPA facility identifiers and cross-program links for reconciling environmental records.
EPA Greenhouse Gas Reporting
Facility greenhouse-gas emissions, sectors, locations, rankings, and trends from EPA.
FEMA National Risk Index
County and census-tract screening across 18 natural hazards, vulnerability, and resilience.
National Register Historic Properties
Official unrestricted National Register buildings, sites, structures, objects, and districts.
USFS Site Wildfire Risk
Four national Wildfire Risk to Communities visualization metrics at one point.
CalGEM California Oil & Gas Wells
Wells near a California parcel, idle and orphan exposure, and the state review that can hold up a local building permit.
Colorado ECMC Oil & Gas Proximity
What sits near a Colorado parcel, over it, or is docketed to be drilled next door.
CA Air Resources Board
Which California air district and basin govern a location, whether it sits in a community air protection area, and what offset projects cover it.
USACE National Inventory of Dams
Which listed dams sit near a site, the hazard class the regulator assigned each one, and its condition and inspection record.
EPA Drinking Water (SDWIS)
Which public drinking water systems report service to a county, and what each one has been cited for.
National Response Center (USCG) Spill Reports
Reported oil, chemical, and hazmat releases called in to the Coast Guard hotline, by county and calendar year.
DoD Military Installations and Ranges
Where a property sits relative to military installation, range, and training area boundaries, and whether foreign buyer rules attach to the site.
The parcel record
Boundary, geometry, and the owner the county carries.
US Public Parcels
Points to the official parcel source for every US state, DC, and inhabited territory. The same query format works wherever ParcelOps has checked a public source.
Texas Statewide Parcels
Official statewide Texas parcel lookup from the Texas Geographic Information Office. Fields include the address on the tax record, owner, value, land use, and tax year where published.
Netherlands Cadastre
Parcel shapes for the whole Netherlands from the national land registry, Kadaster, on its official PDOK data service.
Regrid Premium Parcels
Nationwide standardized Regrid parcel records for owner, land use, zoning, acreage, and assessed values, using your own Regrid API key.
ATTOM Property Data
ATTOM property detail, county assessment, recorded sale history, and AVM estimates with your own ATTOM API key.
RentCast Property & Rents
RentCast property records, value estimates, long-term rent estimates, and sale comparables with your own RentCast API key.
Florida Statewide Parcels
Statewide 2025 parcel attributes and geometry for all 67 Florida counties.
BLM Public Land Survey System
Official PLSS township, range, section, meridian, and survey geometry.
Louisiana State Lands
A clearly labeled October 25, 2023 snapshot of Louisiana state-owned land tracts.
North Dakota Trust Surface Lands
North Dakota trust-land surface agricultural leases and public-access attributes.
Catalogued for this role, not live.
ParcelOps has these in the directory for this kind of work and has not connected them, so they answer nothing today and no link goes to them. Naming them is the point of a page like this: Spain Cadastre INSPIRE, France Cadastre, UK Land Registry INSPIRE.
What this does not cover.
The paragraph a directory of sources will not write, and the one worth reading before an answer goes into a decision someone else pays for.
- ParcelOps files nothing. It has no connection to an appraisal district portal and no view of your deadlines.
- Appeal procedure, evidence rules, and deadlines are set by state and often by county. Confirm them against the office that publishes them.
- Assessed value is a tax record rather than a market opinion, and in non-disclosure states there is no public sale price to argue with.
- Assessment history coverage is uneven. Some counties publish a decade, some publish the current year, and exempt or agricultural years often carry no value.
Where Texas goes deeper.
Texas has the most published behind it here: a statewide parcel layer, an appraisal history by year, and the county requirements that govern what a filing has to include. A question about a Texas parcel usually answers more completely than the same question somewhere else.
That is a coverage fact and not a product position. Where another state publishes the same records the same question answers the same way, and where it does not, ParcelOps says so rather than filling the gap with an estimate.
County by county.
Everything in an appeal is county work. The county pages name the counties where ParcelOps has a parcel route it has queried and checked, along with the fields each route returns.
Coverage here is stated county by county rather than claimed nationally. A county gets a page once there is a route ParcelOps has queried and checked, with named fields and a check date, and a county without one is named as having none. Last checked July 30, 2026.
Questions tax teams ask.
Can ParcelOps file an appeal?
No. There is no filing surface here and no connection to an appraisal district portal. What it does is assemble the record side of the argument, with the year and the publishing office attached to every number, so the evidence is checkable by whoever reads it next.
What is the strongest record based argument this supports?
A carried value read against its own history, with a documented site condition next to it. The year over year figures come back labeled, and a mapped flood zone, a wetland crossing, or an access constraint comes back with the agency that published it. Both halves are checkable by whoever reads the file next, which is the property a piece of appeal evidence needs most.
How much of this is Texas only?
The county requirements and the appraisal history are, because no national office publishes an equivalent. Everything else, meaning the parcel record, the published assessment data, and the site conditions, answers wherever a county has a route that has been queried and checked. The county pages name which counties those are, so the depth of an answer is knowable before the work starts.
The work this sits in.
Commercial real estate
Parcel and assessment records, building programs, and the entity on the other side of the deal.
Residential real estate
The parcel record, the housing programs that touch an address, and the conditions a buyer asks about.
Other roles.
Land brokers
The county record behind a tract, the ground under it, and the questions only a survey or a deed can settle.
Site selectors
Grid, water, hazard, airspace, and parcel screening for candidate sites, before anyone signs a letter of intent.
Commercial real estate analysts
The assessor record, the program geography, the environmental file, and the entity across the table.
Residential agents
The county facts behind an address, the flood answer buyers ask for, and the programs a buyer may fall inside.
Appraisers and assessment staff
Assessment history by year, the parcel record behind it, and the site conditions a report has to mention.
Environmental consultants
Facilities, releases, water, wetlands, and land reuse records around a site, with what each record actually asserts.
Lenders and underwriters
The county record behind collateral, the published hazard picture, and the program geography that changes terms.
Title and escrow teams
No recorded documents and no search. What is here is the county record a file gets reconciled against.
Real estate attorneys
Federal rule text with its citation, open rulemaking, party records, and the property facts behind a filing.
Platform and integration engineers
One endpoint across parcel, hazard, siting, program, and entity records, with per source coverage and limits published up front.
Check it against a property you already know.
The free plan includes 50 tool calls for the life of the account. They never expire and never refill, and there is no credit card. The fastest way to judge any of this is to run an address whose answer you can already verify.