U.S. Census Bureau API

The Census Bureau API provides programmatic access to over 1,700 datasets including the American Community Survey (ACS), Decennial Census, Current Population Survey, County Business Patterns, Economic Census, and Population Estimates. Data covers demographics, housing, income, employment, business patterns, and economic indicators at the national, state, county, tract, and ZIP code level. A free API key is required. Data is public domain and not subject to copyright.

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What You Can Query

You can query the ACS 5-year and 1-year surveys, Decennial Census, and County Business Patterns for variables like total population, median household income, median home value, and rent — filterable by state, county, census tract, and ZIP code tabulation area.

What You Can Do

Querying demographic profiles by state, county, or ZIP code

Analyzing income distribution and poverty rates across geographies

Tracking population growth and migration trends

Studying housing characteristics and occupancy rates

Exploring county-level business patterns by industry

Comparing educational attainment across demographic groups

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FRED (Federal Reserve Economic Data) API

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Bureau of Labor Statistics

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World Bank Development Indicators

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Frankfurter Currency Exchange Rates

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Census Demographics by ZIP Code & DMA

ZIP-level population, age, race, and ethnicity data from the 2024 ACS with DMA market area mappings.

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IRS Income Statistics by ZIP Code (2022)

ZIP-level income tax data with AGI brackets, income sources, deductions, and credits for 27,590 ZIP codes.

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National Weather Service

Current conditions, forecasts, and severe weather alerts for U.S. locations via the National Weather Service.

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Open-Meteo Historical Weather Archive

Global historical weather reanalysis back to 1940 with hourly and daily variables by coordinate, no API key required.

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EPA AirNow Air Quality

Real-time and forecast Air Quality Index (AQI) data for PM2.5, PM10, and ozone across the US, Canada, and Mexico.

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CMS Medicare Provider Data

U.S. Medicare provider quality ratings, hospital comparisons, nursing home inspections, physician data, and healthcare spending from CMS.gov.

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USGS Earthquake Catalog

Real-time and historical earthquake data worldwide including magnitude, location, depth, and tsunami alerts from the USGS.

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USGS Water Data

Real-time and historical U.S. water data including streamflow, water levels, water quality, and groundwater measurements from USGS monitoring stations nationwide.

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College Scorecard

Institution-level and field-of-study data for 6,500+ colleges including costs, earnings, graduation rates, and admissions.

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County-level health outcomes, behaviors, clinical care, and socioeconomic factors for 3,200+ U.S. counties.

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Medicaid Provider Spending

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OpenFDA

FDA public data on drug adverse events, recalls, medical devices, food enforcement, and product labeling.

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USDA FoodData Central

Nutrient profiles for 300,000+ foods including branded products, foundation foods, and survey data from the USDA.

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HUD User Housing Data

Fair Market Rents, income limits, USPS vacancy data, and geographic crosswalks from the U.S. Department of Housing and Urban Development.

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NASA APIs

Access NASA space and Earth science data including astronomy images, asteroid tracking, Mars rover photos, and space weather.

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MLB Statcast (Baseball Savant)

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Complete 2022 NAICS code hierarchy with all 2,122 industry classifications across 5 levels.

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Geographic reference for 33,791 ZIP codes with state, county, coordinates, and land area.

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