Glossary
National Mortgage Database
National Mortgage Database is (NMDB) is FHFA's nationally representative 5% sample of the US closed-end first-lien residential mortgage universe, published only as aggregate origination, outstanding-balance and performance tables by geography, loan type and borrower segment. In Datadory's catalog of 1,744 datasets, dataset: FHFA National Mortgage Database (NMDB) Aggregate Statistics and FHFA Data Portal are working examples.
What is National Mortgage Database?
The National Mortgage Database (NMDB) is FHFA's nationally representative 5% sample of the US closed-end first-lien residential mortgage universe, published only as aggregate origination, outstanding-balance and performance tables by geography, loan type and borrower segment.
Quarterly performance tables run through 2026 Q1 as of the 6/26/2026 release.
In this catalog it appears concretely: - dataset: FHFA National Mortgage Database (NMDB) Aggregate Statistics. - FHFA Data Portal (time coverage) — "NMDB from 1998".
Why does National Mortgage Database matter when choosing a dataset?
A label on a listing is not a deliverable. Teams that license on the strength of a product-name match routinely find the shipped files cover a narrower slice than they assumed, and backfilling history afterwards costs more than the license ever did.
The failure mode is concrete: the label appears in a listing, the delivered files tell a different story, and the gap surfaces mid-project when fixing it is most expensive.
You rarely have to take a vendor's word for it. 82.4% of the 1,744 datasets Datadory catalogs are free to access, and dataset: FHFA National Mortgage Database (NMDB) Aggregate Statistics lets you inspect the real artifact before any budget is committed.
How do you evaluate National Mortgage Database in a data source?
Treat every claim of this attribute as testable:
- Open dataset: FHFA National Mortgage Database (NMDB) Aggregate Statistics and compare its listing against the delivered artifact before paying for a commercial equivalent.
- Read FHFA Data Portal's record on time coverage — "NMDB from 1998" — then confirm the delivered artifact matches before you license anything.
See the term applied to real records: commercial-residential-mortgage-finance data, real-estate-operating-companies data.
Related terms
Adjacent concepts worth reading next: - borrower credit profile - conforming loan limits - debt to income ratio - delinquency rate - loan-to-value ratio - UAD appraisal aggregate statistics
Frequently asked questions
What is an example of National Mortgage Database?
dataset: FHFA National Mortgage Database (NMDB) Aggregate Statistics is the clearest example in this catalog. Its listing is the reference point for this pattern. Across all 1,744 datasets Datadory averages a quality score of 7.81 out of 10, so a named example can be weighed rather than trusted blindly.
Is data described as "National Mortgage Database" free to use?
Treat access and permission separately. 82.4% of the 1,744 datasets in this catalog are free to access, but 235 are freemium and 61 are paid outright, so confirm both the price and the license on the exact distribution before building on it.
How do I verify a source really provides National Mortgage Database?
structured dataset: FHFA National Mortgage Database (NMDB) Aggregate Statistics next to FHFA Data Portal and compare the promise with the download. Field definitions are verified for 1495 of 1,744 datasets (85.7%), which makes that check fast inside the catalog and manual outside it.
Datasets containing this field
Datasets containing National Mortgage Database
6 datasets carry national mortgage database in the catalog. Open one, count the fields, judge for yourself.
FHFA House Price Index (HPI)
FHFA Public Use Database (PUDB)
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