Read Me File for the 2006 American Community Survey (ACS)

Some data values represent unique situations where either:
a) the information to be conveyed is an explanation for the absence of data, represented by a symbol in the data display, such as "(X)", or
b) the information to be conveyed is an open-ended distribution, such as 115 or greater, represented by 115+.

Following are the special data values (and their meaning) for case (a), which can appear in any 2006 ACS table or map product:

-999999999 = N   Indicates that an estimate or its margin of error cannot be provided because the number of sample cases is too small for the given geographic area.

-888888888 = (X)   Indicates that the estimate is not applicable or not available.

-777777777 = (Z)  Estimate is not available for an undefined reason.

-666666666 = -    Indicates that no smaple observations were available to compute an estimate, or a ratio of medians cannot be calculated because one or both of the median estimates falls in the lowest interval or upper interval of an open-ended distribution.


Following are the special data values (and their meaning) for case (b), which are specific to a particular 2006 ACS Detailed Table, or to a 2006 ACS table or map which is "sourced" or derived from these same Detailed Tables:

TABLE_ID | LOW_END_DATA_VALUE | MEANING_OF_LOW_END_DATA_VALUE | HIGH_END_DATA_VALUE | MEANING_OF_HIGH_END_DATA_VALUE

B01002 | 0 | 1- | 116 | 115+
B01002A | 0 | 1- | 116 | 115+
B01002B | 0 | 1- | 116 | 115+
B01002C | 0 | 1- | 116 | 115+
B01002D | 0 | 1- | 116 | 115+
B01002E | 0 | 1- | 116 | 115+
B01002F | 0 | 1- | 116 | 115+
B01002G | 0 | 1- | 116 | 115+
B01002H | 0 | 1- | 116 | 115+
B01002I | 0 | 1- | 116 | 115+
B05004 | 0 | 1- | 116 | 115+
B06002 | 0 | 1- | 116 | 115+
B06002PR | 0 | 1- | 116 | 115+
B06011 | 2499 | 2,500- | 100001 | 100,000+
B06011PR | 2499 | 2,500- | 100001 | 100,000+
B07002 | 0 | 1- | 116 | 115+
B07002PR | 0 | 1- | 116 | 115+
B07011 | 2499 | 2,500- | 100001 | 100,000+
B07011PR | 2499 | 2,500- | 100001 | 100,000+
B08103 | 0 | 1- | 116 | 115+
B08121 | 2499 | 2,500- | 100001 | 100,000+
B08503 | 0 | 1- | 116 | 115+
B08521 | 2499 | 2,500- | 100001 | 100,000+
B10010 | 2499 | 2,500- | 200001 | 200,000+
B18040 | 2499 | 2,500- | 100001 | 100,000+
B18041 | 2499 | 2,500- | 100001 | 100,000+
B18042 | 2499 | 2,500- | 100001 | 100,000+
B18043 | 2499 | 2,500- | 100001 | 100,000+
B18044 | 2499 | 2,500- | 100001 | 100,000+
B18045 | 2499 | 2,500- | 100001 | 100,000+
B18046 | 2499 | 2,500- | 100001 | 100,000+
B19013 | 2499 | 2,500- | 200001 | 200,000+
B19013A | 2499 | 2,500- | 200001 | 200,000+
B19013B | 2499 | 2,500- | 200001 | 200,000+
B19013C | 2499 | 2,500- | 200001 | 200,000+
B19013D | 2499 | 2,500- | 200001 | 200,000+
B19013E | 2499 | 2,500- | 200001 | 200,000+
B19013F | 2499 | 2,500- | 200001 | 200,000+
B19013G | 2499 | 2,500- | 200001 | 200,000+
B19013H | 2499 | 2,500- | 200001 | 200,000+
B19013I | 2499 | 2,500- | 200001 | 200,000+
B19019 | 2499 | 2,500- | 200001 | 200,000+
B19049 | 2499 | 2,500- | 200001 | 200,000+
B19080 | 2499 | 2,500- | 100001 | 100,000+
B19081 | 0 | 0 | 250001 | 250,000+
B19113 | 2499 | 2,500- | 200001 | 200,000+
B19113A | 2499 | 2,500- | 200001 | 200,000+
B19113B | 2499 | 2,500- | 200001 | 200,000+
B19113C | 2499 | 2,500- | 200001 | 200,000+
B19113D | 2499 | 2,500- | 200001 | 200,000+
B19113E | 2499 | 2,500- | 200001 | 200,000+
B19113F | 2499 | 2,500- | 200001 | 200,000+
B19113G | 2499 | 2,500- | 200001 | 200,000+
B19113H | 2499 | 2,500- | 200001 | 200,000+
B19113I | 2499 | 2,500- | 200001 | 200,000+
B19119 | 2499 | 2,500- | 200001 | 200,000+
B19121 | 2499 | 2,500- | 200001 | 200,000+
B19125 | 2499 | 2,500- | 200001 | 200,000+
B19126 | 2499 | 2,500- | 200001 | 200,000+
B19202 | 2499 | 2,500- | 200001 | 200,000+
B19202A | 2499 | 2,500- | 200001 | 200,000+
B19202B | 2499 | 2,500- | 200001 | 200,000+
B19202C | 2499 | 2,500- | 200001 | 200,000+
B19202D | 2499 | 2,500- | 200001 | 200,000+
B19202E | 2499 | 2,500- | 200001 | 200,000+
B19202F | 2499 | 2,500- | 200001 | 200,000+
B19202G | 2499 | 2,500- | 200001 | 200,000+
B19202H | 2499 | 2,500- | 200001 | 200,000+
B19202I | 2499 | 2,500- | 200001 | 200,000+
B19215 | 2499 | 2,500- | 200001 | 200,000+
B19326 | 2499 | 2,500- | 100001 | 100,000+
B20002 | 2499 | 2,500- | 100001 | 100,000+
B20004 | 2499 | 2,500- | 100001 | 100,000+
B20017 | 2499 | 2,500- | 100001 | 100,000+
B20017A | 2499 | 2,500- | 100001 | 100,000+
B20017B | 2499 | 2,500- | 100001 | 100,000+
B20017C | 2499 | 2,500- | 100001 | 100,000+
B20017D | 2499 | 2,500- | 100001 | 100,000+
B20017E | 2499 | 2,500- | 100001 | 100,000+
B20017F | 2499 | 2,500- | 100001 | 100,000+
B20017G | 2499 | 2,500- | 100001 | 100,000+
B20017H | 2499 | 2,500- | 100001 | 100,000+
B20017I | 2499 | 2,500- | 100001 | 100,000+
B21004 | 2499 | 2,500- | 100001 | 100,000+
B22008 | 2499 | 2,500- | 200001 | 200,000+
B23013 | 0 | 1- | 116 | 115+
B24011 | 2499 | 2,500- | 100001 | 100,000+
B24012 | 2499 | 2,500- | 100001 | 100,000+
B24021 | 2499 | 2,500- | 100001 | 100,000+
B24022 | 2499 | 2,500- | 100001 | 100,000+
B24031 | 2499 | 2,500- | 100001 | 100,000+
B24032 | 2499 | 2,500- | 100001 | 100,000+
B24041 | 2499 | 2,500- | 100001 | 100,000+
B24042 | 2499 | 2,500- | 100001 | 100,000+
B24081 | 2499 | 2,500- | 100001 | 100,000+
B24082 | 2499 | 2,500- | 100001 | 100,000+
B24091 | 2499 | 2,500- | 100001 | 100,000+
B24092 | 2499 | 2,500- | 100001 | 100,000+
B25018 |  |  | 9.1 | 9.0+
B25021 |  |  | 9.1 | 9.0+
B25035 | 1939 | 1940- | 2005 | 2005
B25037 | 1939 | 1940- | 2005 | 2005
B25039 | 1969 | 1970- | 2005 | 2005
B25057 | 99 | 100- | 2001 | 2,000+
B25058 | 99 | 100- | 2001 | 2,000+
B25059 | 99 | 100- | 2001 | 2,000+
B25064 | 99 | 100- | 2001 | 2,000+
B25071 | 9.9 | 10.0- | 50.1 | 50.0+
B25076 | 9999 | 10,000- | 1000001 | 1,000,000+
B25077 | 9999 | 10,000- | 1000001 | 1,000,000+
B25078 | 9999 | 10,000- | 1000001 | 1,000,000+
B25083 | 9999 | 10,000- | 1000001 | 1,000,000+
B25088 | 99 | 100- | 4001 | 4,000+
B25088 | 1001 | 1,000+
B25092 | 9.9 | 10.0- | 50.1 | 50.0+
B25097 | 9999 | 10,000- | 1000001 | 1,000,000+
B25099 | 2499 | 2,500- | 200001 | 200,000+
B25103 | 199 | 200- | 10001 | 10,000+
B25105 | 99 | 100- | 4001 | 4,000+
B25107 | 9999 | 10,000- | 1000001 | 1,000,000+
B25109 | 9999 | 10,000- | 1000001 | 1,000,000+
B25111 | 99 | 100- | 2001 | 2,000+
B25113 | 99 | 100- | 2001 | 2,000+
B25119 | 2499 | 2,500- | 200001 | 200,000+