Open mortgage datasets
The reference data behind every calculator on this site, as CSV and JSON. Every figure carries its source and the year it takes effect. Free to reuse — including commercially — as long as you credit where it came from.
US State Property Tax Rates
Average effective property tax rate, median home value and estimated annual property tax for all 50 US states, with assessment basis, homestead exemption and appeal process where published.
Source
U.S. Census Bureau and Zillow Research
Data as of
June 2026
Last updated
August 2026
Version
1.0.0
Columns
stateavg_effective_tax_rate_percentmedian_home_value_usdestimated_annual_tax_usdassessment_basisassessment_capexemptionsfiling_deadlineappeal_bodyappeal_windowofficial_sourceConforming Loan Limits
The baseline conforming loan limit that separates conventional lending from jumbo, published annually by the FHFA.
Source
Federal Housing Finance Agency
Data as of
2025
Last updated
August 2026
Version
1.0.0
Columns
limit_typedescriptionamount_usdas_ofsourcesource_urlchanges_annuallyFHA Loan Limits and Premiums
FHA loan limit floor and ceiling, upfront and annual mortgage insurance premiums, minimum down payments by credit score, and the rules governing when annual MIP ends.
Source
U.S. Department of Housing and Urban Development
Data as of
2025
Last updated
August 2026
Version
1.0.0
Columns
keydescriptionvalueunitas_ofsourcesource_urlCite this dataset
FHA Loan Limits and Premiums — citation loads in your browser- Permanent URL
- https://www.usmortgagecalc.com/datasets#fha-limits
- Licence
- CC-BY-4.0
Mortgage Insurance Assumptions
Mortgage insurance across all four loan programmes — conventional PMI, FHA MIP, the VA funding fee and the USDA guarantee fee — including the statutory PMI cancellation thresholds and which premiums cancel at all.
Source
Multiple federal agencies — see source column per row
Data as of
2025
Last updated
August 2026
Version
1.0.0
Columns
programkeydescriptionvalueunitcancelsas_ofsourcesource_urlOwnership Cost and Qualifying Assumptions
Maintenance budgets, buyer and seller closing cost ranges, and the debt-to-income thresholds lenders underwrite against. Homeowners insurance premiums are a user input rather than a modelled value — see the notes for why.
Source
Consumer Financial Protection Bureau
Data as of
2025
Last updated
August 2026
Version
1.0.0
Columns
keydescriptionvalueunitas_ofsourcesource_url- Homeowners insurance premiums are not modelled per state. Premiums vary by carrier, construction, claims history and proximity to peril in ways a statewide average cannot represent responsibly, so the calculators take an annual premium as an input instead.
- Maintenance and closing cost figures are ranges, not point estimates. Publishing a single number would imply a precision the underlying sources do not support.
Cite this dataset
Ownership Cost and Qualifying Assumptions — citation loads in your browser- Licence
- CC-BY-4.0
Licence
Everything here is published under the Creative Commons Attribution 4.0 International licence. Free to use, share and adapt, including commercially, provided the source is credited.
Attribution rather than public domain is a deliberate choice: the data is free, and naming where it came from is what lets a reader check it.
Prefer an API?
The same data is served live over the REST API with no key — /api/v1/states for the state table and /api/v1/assumptions for every constant. A machine-readable index of these downloads lives at /datasets/index.json.
What is not in here
Homeowners insurance premiums are not published per state. They vary by carrier, construction type, claims history and distance to peril in ways a statewide average would misrepresent, so the calculators take a premium as an input instead of inventing one. County-level property tax rates are also absent: the rates here are statewide averages, and counties within a state routinely differ by a factor of two. The methodology page sets out every limit in full.
Found an error, or need a cut we do not publish? Tell us.