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The census tract should be an 11 digit number. The census tract combines the 2 digit state, 3 digit county, and 6 digit tract code (with no decimal). The county code is a 5 digit number that combines state and county codes.

Block Groups (BGs) are statistical divisions of census tracts, are generally defined to contain between 600 and 3,000 people, and are used to present data and control block numbering.

The HIPAA safe harbor method is a method of de-identification of protected health information. De-identification is the removal of specific information about a patient that can be used alone or in combination with other information to identify that patient.

De-identify patient data with Safe Harbor Under the Safe Harbor method, a predetermined set of 18 data values must be redacted from a patient dataset. Safe Harbor is a highly prescriptive method that protects patient privacy.

Census tracts aim to have about 4000 people in them, (zip codes average 8000 people, but vary greatly). Block groups are smaller and have ~1500 people each. Census blocks are the smallest division, about 40 blocks per group, but unlike census tracts they are highly variable (in terms of statistical demographics).

A block group is a subdivision of a census tract and contains a cluster of blocks. Block groups usually have between 250 and 550 housing units. A census block is the smallest geographic census unit. Blocks can be bounded by visible features?such as streets?or by invisible boundaries, such as city limits.

A census block group is a cluster of census blocks having the same first digit of their four-digit identifying numbers within a census tract. Block groups generally contain between 600 and 3,000 people, with an optimum size of 1,500 people. There are about 39 blocks per census group.

So, for example, if one wanted to allocate data from ZIP code 03870 to each Census tract located in that ZIP code, one would multiply the number of observations in the ZIP code by the residential ratio for each tract associated with that ZIP code.

Census tracts and block groups are redefined each decade through the Census Bureau's Participant Statistical Areas Program or PSAP, in association with the decennial census. Tribal tracts and tribal block groups were defined through a similar program, the Tribal Statistical Areas Program or TSAP.

Census blocks are numbered uniquely with a four-digit census block number from 0000 to 9999 within census tract which nest within state and county. The first digit of the census block number identifies the block group. Block numbers beginning with a zero (in Block Group 0) are only associated with water-only areas.