The USC point-in-polygon Census Intersection engine can be used from desktop and/or web applications via the Web Service interfaces listed below. The only required information is the API key, which is available in your account profile page. You may want to read the technical details.

API Version - 2.92

Available Web Services

API #1 - .Net Point-In-Polygon Census Intersction Web Service

• API that can be used from scripts, http, and SOAP compatible clients

• API URL

  https://webgis.usc.edu/Services/CensusIntersection/WebService/CensusIntersectionWebService.asmx

API #2 - HTTP Point-In-Polygon Census Intersction Web Service

• API that can be used from scripts and http

• API URL

  https://webgis.usc.edu/Services/CensusIntersection/WebService/CensusIntersectionWebServiceHttp.aspx?

  API Input Fields

  Parameter	Required	Description	Example	Possible Values
  apiKey	true	click here for your API key	api-key-value	text string
  version	true	the version of the parser to use	2.92	2.92
  lat	true	the latitude of the input coordinate	34.0726207994348	double
  lon	true	the longitude of the input coordinate	-118.397965182076	double
  s	false	the abbreviation of the state of the input	CA	text string
  format	false	output format	csv	csv, tsv, xml
  notStore	false	indicates if the transaction details should not be historically stored in your account	true	true, false

  API Output Fields and Index (for non-XML output)

  Position	Field	Required	Description
  0	TransactionId	true	query id
  1	QueryStatusCodeValue	true	result code
  2	QueryStatusCodeName	true	result code name
  3	Census2000Block	true	Census 2000 block for the input point
  4	Census2000BlockGroup	true	Census 2000 block group for the input point
  5	Census2000Tract	true	Census 2000 tract for the input point
  6	Census2000CountyFips	true	Census 2000 county fips for the input point
  7	Census2000StateFips	true	Census 2000 state fips for the input point

• API Examples

  Example 1 - 34.0726207994348, -118.397965182076, CA (CSV)
  
  Example 2 - 34.0726207994348, -118.397965182076, CA (XML)
  
  Example 3 - 34.0726207994348, -118.397965182076 (CSV)
  
  Example 4 - 34.0726207994348, -118.397965182076 (XML)