"Map" (Archive). City of Gretna. Retrieved on May 18, 2014. Compare the city boundary to the boundaries of the particular schools, and compare the city boundary to school addresses (to check whether the school is actually in the city limits). In regards to the latter, the City of Houston stated: "The U.S. Postal Service establishes ZIP codes and mailing addresses in order to maximize the efficiency of their system, not to recognize jurisdictional boundaries."
gretnapolice.com
Curry, Mary Grace. "Gretna Police History". Gretna Police Department. Retrieved June 26, 2016.
"Map" (Archive). City of Gretna. Retrieved on May 18, 2014. Compare the city boundary to the boundaries of the particular schools, and compare the city boundary to school addresses (to check whether the school is actually in the city limits). In regards to the latter, the City of Houston stated: "The U.S. Postal Service establishes ZIP codes and mailing addresses in order to maximize the efficiency of their system, not to recognize jurisdictional boundaries."