[CTPP] 2010 Census Block-Level Data is Changed SF1-P1

Our MPO has been working on getting Census block data aggregated to TAZ levels and we noticed that Census data that was downloaded when 2010 Census data was released does not match 2010 Census Data that was downloaded today. We've done various checks between the two tables (SF1-P1), and the sums are different. Our MPA population count with the older data is 297,986 and the sum the new data is showing us is 297,290. We did check this with ESRI's Community Analyst and it agrees with the older data that our MPA should have a Census 2010 population of 297,986. Is there a reason when Census data might change? If the P1 data has changed, then I'm wondering if other Census data might be different too. Thank you, Geoff Olson Transportation Planner Bi-State Regional Commission 1504 3rd Ave. P.O. Box 3368 Rock Island, IL 61204 (309) 793-6302 ext. 151 This email and all attachments are intended only for the listed recipient(s). This message may contain confidential or privileged information only for use by the listed recipient(s). Do not forward, post or otherwise disclose the contents of this email without the permission of the sender. If you received this message in error, please delete it and notify the sender immediately. Bi-State Regional Commission accepts no responsibility for any damages caused by this message, including those related to viruses or malware.