Brookfield Zip Code
(Illinois)

You can use zip codes for primary, secondary and acceptable cities but while mailing your package always use Brookfield or accepted city name. The primary city may not be the city in which the ZIP is located but is usually the name of the main post office.

Primary City : Brookfield, IL

If you are seeing same secondary city on multipal zip codes than you can use any one of this zip code for your mailing purpose. The reason behind this is that the particular secondary area is large enough to cover more than one zip code areas. You can click on individual zip code links to see the area boundary for more accuracy.