Technical documents are designed to help people use published statistics. The resources available for download may vary by census year and can include the following.

Codebooks - Information about the files, including descriptive information on all of the variables.

Data Dictionary - A repository of information describing database attributes including identification of record codes and area characteristics, endnotes, and table section.

Historical Changes - Information for the current census year and prior census years.

Methodology - The methods we use to collect census data and produce the census results, including sampling, questions, collection, review, quality, weighting, etc.

Questionnaires - Find the most recent questionnaire and whether an archive of past questionnaires is available online.

Subject Definitions - Definitions of population, housing and other variables to help you understand the results of a census.

User Notes - Issues affecting the census, including design, collection, processing, tabulation, and release, to be better informed when analyzing stats.