Data obtained from

Data from previous years can be obtained from https://www.dol.gov/agencies/eta/foreign-labor/performance

The following Kaggle challenge also contains data from previous years. https://www.kaggle.com/nsharan/h-1b-visa/notebooks

US State name to abbreviation copied from https://gist.github.com/rogerallen/1583593

GeoJSON file for ZIPCODE boundaries are provided by https://github.com/OpenDataDE/State-zip-code-GeoJSON

Some other Stackoverflow references are included in code.

Some analytics are inspired by

https://medium.com/@saidakbarp/interactive-map-visualization-with-folium-in-python-2e95544d8d9b

https://www.kaggle.com/saidakbarp/nyc-property-sales-eda-map-analysis/data#Map-analysis

There are 2 main files. data_cleaning and data_analysis. You should clean data first then run data analysis.