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HUD-USPS ZIP Code Crosswalk Resolver
x402
HUD-USPS ZIP Code Crosswalk Resolver is a paid API for AI agents from 2s.io, paid per call via x402, $0.012/call, status unknown (last checked 2026-09-14).
Resolves a US ZIP code to overlapping census tracts, counties, CBSAs (metro areas), and congressional districts with HUD-USPS allocation ratios by address type
Price / call$0.012
Success—
StatusUnknown
How this service works
Resolve a US ZIP code to the census tract(s), county, CBSA (metro), and congressional district it covers — each with HUD-USPS allocation ratios (by residential, business, other, and total address counts). A ZIP is a mail-delivery route set, not a polygon, so it spans multiple geographies; the ratios tell you how much of the ZIP falls in each — the canonical join when you have a ZIP but a dataset is keyed by county/tract/district. Source: HUD-USPS ZIP Crosswalk (public domain).
Output
A list of geographic units (census tracts, counties, CBSAs, congressional districts) that overlap the given ZIP code, each with HUD-USPS allocation ratios broken down by residential, business, other, and total address counts — indicating what fraction of the ZIP falls within each geography.
Example use cases
Example prompt
“What census tracts, county, metro area, and congressional district does ZIP code 90210 fall in — and what are the HUD-USPS allocation ratios showing how much of that ZIP is in each geography?”
Technical details
Endpoint
GEThttps://2s.io/api/geo/zip-resolveWhen to prefer
Use this endpoint when you have ZIP-coded data and need to join it to datasets keyed by county FIPS, census tract, CBSA, or congressional district — especially when you need proper allocation ratios to handle ZIP codes that span multiple geographies. Prefer this over simple centroid-based lookups when accuracy of split-geography attribution matters.
Side effects
- Invalid or non-existent ZIP code returns an error or empty result
- ZIP codes for PO Boxes or unique ZIP codes (e.g. for large organizations) may have unusual or no crosswalk data
- Recently retired or newly created ZIP codes may not appear in the HUD-USPS dataset
- Missing 'zip' query parameter returns a 400 or validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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