Madison County, IL  1840   Federal Census
ftp://ftp.us-census.org/pub/usgenweb/census/il/madison/1840/

The files on-line for this "complete" county,  include: 

FILE-NAME   PRECINCT
pg0073.txt  Highland
pg0080.txt  Marine
pg0086.txt  Madison
pg0089.txt  Ridge Prairie
pg0097.txt  "     "
pg0104.txt  Indian Creek and Rattans Prairies
pg0106.txt  Omph Ghent
pg0110.txt  Choten and Gabourne Island
pg0112.txt  Silver Creek
pg0115.txt  Six Mile
pg0121.txt  Monticello
pg0125.txt  Alton City
pg0132.txt  "     "
pg0138.txt  Upper Alton
pg0144.txt  Upper Alton Precincts
pg0150.txt  Town of Edwardsville / Edwardsville Precinct
    

============================================================================
This Census was transcribed by Karen Morbeck Hayden and proofread by 
B. P. Hayden for the USGenWeb Census Project http://www.us-census.org/
============================================================================