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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.

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.

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.

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.?

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.

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.

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.

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.