US Census API - data by census tract

Question

Using the US Census Tract API I can search for the age population in different parts of the country

http://api.census.gov/data/2010/sf1?key=[key]&get=PCT0120125&for=county:*

returns list of women aged 18 by county and PCT0120021 for men.

[
["PCT0120125","state","county"],
["405","01","001"],
["1153","01","003"],
["163","01","005"],
["137","01","007"],
["361","01","009"],
["56","01","011"],
["137","01","013"],
...

How could I look up the corresponding information by Census tract?
Something like for=tract:* but that gives me error messages error: unknown/unsupported geography heirarchy.

Answer 1

You have to provide a state and county in your query to retrieve Census tract level information.

This does not work:

http://api.census.gov/data/2010/sf1?key=[key]&get= PCT0120125&for=tract:*

but this works:

http://api.census.gov/data/2010/sf1?key=[key]&get=PCT0120125&for=tract:*&in=state:02+county:170