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API » Census API - By Coordinates

This API returns the US Census Block geography ID information given a passed Latitude and Longitude.

Latest data version released jun2014. Previous data versions include jun2011, dec2011, jun2012, dec2012, jun2013, dec2013.

Why We Provide It
We are providing this API to increase the value of the transparency of the National Broadband Map. Just about every major dataset in the US Federal Government uses some form of Census geography. With this API you can retrieve the US Census Block by providing a latitude and longitude coordinate. Providing this search allows developers to build applications which foster connectivity from their individual location to the full array of federal databases based on census geography.

Review Data Dictionary


API Base

API Call
{API Base}census/{geographyType}?latitude={latitude}&longitude={longitude}&format={format}&callback={functionName}&showall={showall}

Sample Call

Required Parameters
specify one of the following geography types: state, county, tract, block, congdistrict, statehouse, statesenate, censusplace, msa

latitude of a point. Example: 41.486857

longitude of a point. Example: -71.294392

Optional Parameters
XML, JSON, JSONP (XML is default)

JSONP callback function name

If the coordinate lies on the boundary of multiple geographies, for a complete list use showall=true to display intersection element(false is default)



<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Response status="OK" responseTime="12">
    <block FIPS="360775908001027">

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