The review of the 2006 ACS tabulations revealed large discrepancies between the final 2006 ACS estimate of total population and the 2006 intercensal population estimates for a set of places in Orange County, CA. These same areas showed a similar pattern of differences in the 2005 ACS tabulated estimates. An additional adjustment to the weights was introduced in the weighting for Orange County to remove the source of the discrepancy. The adjustment was aimed at forcing the weighted distribution of housing units in the ACS sample to match the distribution of housing units on our sampling frame. The weighting adjustment was applied at the census tract level. As a result, it has eliminated most of the large discrepancies originally found for places in Orange County.