There are many measures of accuracy. We generally say that our street data is to an accuracy of &lt10 meters. But if you match a street number address, our data may not be granular enough to be within this range - i.e. we may only know that 7 Main Street is in the 1-50 Block, but cannot tell where within that block number 7 is. Also, ZIP code areas are approximations and there is a potential for wider variations there too.