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For example, a line extends from counties to census tracts because a county is completely comprised of census tracts, and a single census tract cannot cross a county boundary.

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 are part of a hierarchy of census polygons. 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.

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.

How to Create Map from Zip Codes Using Mapize Zip Code Map Maker Copy all your data from the spreadsheet, and paste it into Mapize's map-making tool in the location data box to the right. Or, save your sheet as a CSV file and upload it in the ?Drag and Drop? section on the left. ... Click ?Create Map.?

As mentioned earlier, there are a few ZIP Codes that deliver across state lines, and there are a few ZIP/sectors that cross county lines. There are 153 ZIP Codes in more than one state. There are 9,000 ZIP Codes in more than one county.

The Census Bureau offers a few statistical products by ZIP Code through our economic surveys. These data are available through data.census.gov. Please contact the US Postal Service for additional information about ZIP codes.