Use PUMS data for PUMAS belonging only in one county

Hello! I try to use PUMS 5yr 2008-2012 data and I face a strange fact that when I sum the weights (variable PWGTP in the dataset) for the PUMAS that belong to a specific County, I do not take as a result the known total population in this county (compared to the population from ACS 2008-2012 estimates)...
Could anyone advise me if I use the given weights properly? The PUMS data are for PUMAS in one whole state and I try to extract only the PUMAS in the county that I need. Is it possible or there is problem because the PUMS data are defined at a state level?
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  • There are text files that show what PUMA are in what counties. For 2000 Oklahoma County, OK is made up of 3 5% PUMA (these are the PUMA in the ACS public use file). These PUMA codes are 01301, 01302, 01400.

    See www2.census.gov/.../PUMEQ5-OK.TXT for this information.

    For 2010 Oklahoma county is made up of 6 PUMA 01001 - 01006.

    Unless you are doing extensions cross tabs and need additional sample, using the 2012 1 yr PUMS would make this easier as then you could use the 2010 bases PUMA definitions.
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  • There are text files that show what PUMA are in what counties. For 2000 Oklahoma County, OK is made up of 3 5% PUMA (these are the PUMA in the ACS public use file). These PUMA codes are 01301, 01302, 01400.

    See www2.census.gov/.../PUMEQ5-OK.TXT for this information.

    For 2010 Oklahoma county is made up of 6 PUMA 01001 - 01006.

    Unless you are doing extensions cross tabs and need additional sample, using the 2012 1 yr PUMS would make this easier as then you could use the 2010 bases PUMA definitions.
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