2009 ACS 1-year estimates
The US Census Bureau introduces new variables most years. When they are introduced and the data collected it will first become available in the 1-Year Estimates. For example if a new variable is introduced in 2014 it will be included in the 1-Year Estimates starting in 2014 but it will not be available in the 5-Year Estimates until 2018 (after 5 years of data collection).
The 1-Year Estimates are only available for those geographies with a population of at least 65,000. That means you can run states or MSAs but if you try to run Counties you will only get 831 of the 3,220 counties to appear. The others simply donít meet the population threshold and are suppressed (the USCBís decision not ours).