Unfortunately, no, you can't. There are plenty of zip codes in Missouri that have a dozen small towns that all have 1001 Broadway as valid addresses. There ar

Unfortunately, no, you can't. There are plenty of zip codes in Missouri that have a dozen small towns that all have 1001 Broadway as valid addresses. There are at least 5 zip codes (possibly more, there used to be a list on wiki) that cross state, county, and city boundaries. So it's entirely possible that without the zip+4, you'd have to have both the city and the state to correctly locate an address.