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This section provides tools to examine the relationship between block group geography/demographics and ZIP code areas. Block groups (BGs) are often wholly contained within a ZIP code area. But around the ZIP code area boundary, intersecting block groups are often split by the ZIP code boundary.

Census tracts have well known/exact boundaries. ZIP codes are groups of lines whose exact structural definition is not officially established.

ZIP Codes denote street address groups or delivery routes. Because of this, ZIP Code "areas" can overlap, be contained within another ZIP Code, or have no geographic area. For example, ZIP Codes that start with 095 are assigned to the Navy and therefore have no geographic location.

So what do the extra numbers mean? These last 4 digits represent specific delivery routes within delivery areas. This extra detail means an even more precise matching to a more granular level. It could represent a handful of houses on one side of a street, or even a single building that receives a high volume of mail.

Data scientists should know that ZIP codes do not always fall within state boundaries (or even of the borders of states within a zone). There are over 100 cases where ZIP codes cross state lines.

How to merge ZIP files online Select or drop your ZIP documents to upload for merge. Once upload completes, drag ZIP document thumbnails to rearrange them (if needed). Click on Merge Now button to start merge process. Once your ZIP documents are merged click on Download Now button.

The boundaries of ZIP Codes and census tracts often don't match. If looking up which census tracts relate to a single ZIP Code, that overlap of boundaries doesn't create a major problem in terms of relative social and economic characteristics, but the counts won't be precise.

Core Based Statistical Areas (CBSAs) (metropolitan/micropolitan statistical areas) fall within the nation and often cross state lines. Census tracts must stay within a county and therefore a state. They do not necessarily coincide within any other geography.