Bob and others: The 1970, 1980 and 1990 data on county-to-county total commuter flows is available on the Department of Commerce, Bureau of Economic Analysis web site at: http://www.bea.doc.gov/bea/regional/reis/jtw/ Anything finer grained that county, or county-to-county by means of transportation to work, would have to be extracted from your old 1970 UTP, 1980 UTPP and 1990 CTPP data files. Note that the 1980 Census workplace information was coded for only half of the long form sample. So, essentially the sampling rate for the 1980 commute flows is about 1-in-12, not the 1-in-6 sampling rate we have from the 1990 and 2000 Censuses. Also note that the largest county-of-work in the 1970 Census is "Not Reported." So, take care in how you report/allocate/impute the 1970 data, if at all. Chuck Purvis, MTC Pardon my asking this, but are county-to-county worker flows available from the 1980 census datafiles? I know that it goes back a bit and is not the latest and greatest from the US Census. I have some flow data but am looking for additional counties to include in my review. Bob Paddock Metropolitan Council Minneapols-St.Paul