For academics, journalists, nonprofits & civic projects · reviewed case-by-case
The ZIP Codes API gives you 14 years of US Census ACS demographics (2011–2024) — social, economic, housing, and demographic profiles, roughly 500 fields per ZIP per year — for every US ZIP and Canadian postal code, through one REST call. It's built for reproducible research, reporting, and public-interest analysis. If a project outgrows the free tier, we review research-credit requests case by case.
GEO_ID format change, so a longitudinal series just lines up.null, never zero./zip,
or aggregate every ZIP inside a radius with /radius./radius spatial mode the
API intersects your radius with actual ZIP/FSA boundary polygons and weights the ACS
aggregate by each ZIP's pct_inside — a ZIP 30% inside the circle
contributes 30% of its population, not all-or-nothing.
See the runnable example →
Most projects fit comfortably in the free tier — 2,500 credits/day, no credit card. Start there, and reach out when a project needs more.
A 14-year longitudinal dataset in seconds — e.g. housing-cost (DP04) change for every ZIP in a state, or income shifts around a campus — for theses, dissertations, and published research.
The demographic makeup within a few miles of a toxic-release site, hospital closure, or new development — coverage-weighted by real boundaries — plus "decade of change" maps off the 14-year series.
Who actually lives inside your service area — population and need weighted by how much of each ZIP falls in your catchment — for grant-targeting and program planning.
ZIP or address to congressional, state-legislative, and school districts; radius service-area lookups; reproducible open-data tools and classroom notebooks.
We'd rather size each grant to the actual project than promise a number up front, so please tell us what you're working on (details below) and we'll work it out together.
A simple, good-faith exchange — not a contract:
Copy whichever fits your format:
Demographic data: US Census Bureau ACS 5-Year Estimates, accessed via ZIP Codes API (Zip-Codes.com), https://www.zip-codes.com/api/@misc{zipcodesapi,
title = {ZIP Codes API — US Census ACS demographics by ZIP code},
author = {{Zip-Codes.com}},
note = {US Census Bureau ACS 5-Year Estimates},
url = {https://www.zip-codes.com/api/},
year = {2026}
}Email jharris@zip-codes.com with a few details so we can size a grant to your project:
Subject: Research credits request — [project name]
Affiliation / organization:
Project summary:
Data needed (profiles / years / geography):
Expected volume (a rough estimate is fine):
Intended output (paper, story, tool, class):
Citation or link possible?:
Anything already published or in progress:We read every request personally and reply — usually within a few business days. Requests are evaluated individually; sending one doesn't guarantee a grant.
You don't need to wait for a reply to start. Our open sample repo has a runnable notebook — pull a 14-year demographic series for any US ZIP in about ten lines of Python, no signup required: