Is "migcounty" in 1940 100% census only available for a for few states, i.e. Alaska, Hawaii and Wyoming?


When I import the 1940 100% census data to Stata, I find that there are non-zero observations for the variable migcounty only for those individuals whose 1940 state of residence is Alaska, Hawaii or Wyoming. The total amount of non-zero observations is less than 0.5% of the population. Is this a problem in how I am reading the IPUMS-generated data file, or are there no data for individuals residing in other states?


You have found an error in the 1940 dataset that we did not know about. Thanks for pointing this out! We plan to release a corrected version of the MIGCOUNTY variable in the next couple months. In the meantime, since you identified a significant data error you are now entitled to a shiny, new IPUMS Mug! Please email your address to so that we can send you your prize.

Thank you for helping us maintain these important data resources!