There are several main access points for numerical data and descriptive statistics provided by the United States government. Here you will find overview material and links to aggregated data provided by the government to measure and keep track of information of national interest.
In the tabs to the left you will find links and guides to federal agency sources of statistics, sorted by topic.
Data release schedules for the federal agencies collecting statistics are organized here by the Federal Committee on Statistical Methodology (FSCM), If you are tracking a specific agency's data, you may wish to become familiar with its release schedule.
If you would like to read a background text on the use of statistics before incorporating data into your own work, two useful primers on statistics are: