Note that due to differences in the questions and methodologies used by the Census Bureau, some caution should be used in comparing American Survey Data from year to year. Please consult the Census Bureau's How to Use the Data for further guidance.
American Community Survey Comparison Profiles
The Census Bureau has created profiles that compare 2010 and 2011 American Community Survey One Year Sample data. The profiles indicate whether or not there is a statistically significant difference between the two years. The four comparison surveys are: