Thanks Ed for the link - That's an excellent resource for census geography boundary files. However, I am more interested in the actual geography files that are being shipped with the cd-rom versions of the CTPP Part 1 data. As I understand it geography files are capable of being different from state to state. For example, I know that Missouri is one of the few states that actually had the CTPP data aggregated to a statewide block group coverage - thus, ctpp data exists statewide at the block group level of geography...is this the same for Illinois and Kansas? I don't think that they have the data at that level of geography for the entire state and was hoping to verify this with the boundary files that are being shipped with the cd-roms. Since it doesn't appear that these specific geofiles have been released my second plan is to capture the boundary files of interest for Illinois and Kansas and then join the tabular data from the CTPP to the geography of interest and see what sort of join rates exist - this should then give me a better understanding of the geography files and their extent within each state. Lance -----Original Message----- From: ed christopher [mailto:edc@berwyned.com] Sent: Tuesday, June 08, 2004 10:19 AM To: Huntley, Lance Cc: ctpp-news(a)chrispy.net Subject: Re: [CTPP] CTPP Geography Files you might try here. you may have do do it in three steps to get the TAZs for 3 states. http://arcdata.esri.com/data/tiger2000/tiger_download.cfm "Huntley, Lance" wrote: -- Ed Christopher Resource Center Planning Team Federal Highway Administration 19900 Governors Drive Olympia Fields, Illinois 60461 708-283-3534 (V) 708-574-8131 (cell) 708-283-3501 (F)