Geo Mapping Points in Polygons/Saleszones

This is a points in a polygon project whereby I need to assign places to a sales zone within a U.S. state. I'll provide you the following 2 files for testing: 1. A "Places" csv for an individual U.S. state having a place, type place, latitude, longitude, etc. for the places in that state. 2. A "Saleszones" csv with cornerpoints creating geographic sales zones. For example, cornerpoints number from 3 to 10 resulting in Arizona having 19 zones. Objective: Create a simple tool that assigns places in a U.S. state with a geographic zone for a given state (points in a polygon). First, on a state-by-state basis, uses the Saleszones csv file to create zones for a state. Second, reads the latitude and longitude from the Placesfile csv and assigns all places into a geographic sales zone. Third, outputs a csv file showing zone, place, typeplace, latitude, longitude. Considerations: 1. Some sales zone might have angles under 90 degrees. 2. Places for a state could number in the tens of thousands. In Conclusion: This tool will enable me to load a places and saleszones file for a state. It will assign places to a sales zone and list all the places with it's sales zone in a csv. I'll use this for all 50 states. How this works is up to you. It could be an executable, bat, text file, whatever is easiest.