Description: The H-GAC ZIP code coverage includes polygons and their attributes for Harris, Fort Bend, Brazoria, Galveston, Chambers, Liberty, Montgomery, Waller, Austin, Colorado, Matagorda Wharton and Walker County. It was primarily created from the census 2002 ZIP code boundary data with secondary source data coming from Centerpoint ZIP code, Esri 2009 ZIP code, address point data from centerpoint and counties, CRIS ( Carrier Route Information System) data, US Postal Services Online site ( Look up a ZIP code) and parcels. Must Not Overlap and Must Not have Gaps topology rules have been used in order to create an accurate ZIP code layer. The layer represents physical ZIP codes and a few PO BOX ZIP codes are included rural areas . PO BOX ZIP codes can be identifying by "zip_type" field in the attribute table.
Description: Harris County Mosquito Control's Operational Area Boundaries were initially created during the formation of the program in order to aid in the application of adulticides by providing for appropriately sized geographic areas which could be sprayed in a given night. Due to growth of the county and likely other factors, these initial boundaries were recreated circa 1979 into the rough approximation here. The edits carried out in 2009/2010 on this electronic copy were initially and primarily done in order to bring the boundaries into alignment with their original intended borders (e.g. street, bayou). However, some additional changes were made as other issues were uncovered or ways to improve the boundaries were discovered.