In July, Business First published its annual list of the Louisville area's wealthiest ZIP codes, using data provided to Business First by Esri, a Redlands, Calif.-based research firm. No. 1 on the July 18 list was 40059 (Prospect). Esri's list of wealthiest ZIP codes is compiled from a number of indicators, including average household income and average net worth. Aggregate data from the July 18 list include: • The ZIP code with the largest population among the 25 ZIP codes is 40299 (Jeffersontown),…