Data source links: 

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This dataset includes the borough of zip codes in NYC.

https://data.ny.gov/Government-Finance/New-York-State-ZIP-Codes-County-FIPS-Cross-Referen/juva-r6g2/data

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This dataset shows gas usage of households/industries during 2010

https://data.cityofnewyork.us/w/uedp-fegm/25te-f2tw?cur=zh_ETNBDGVA&from=root

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This dataset shows the population of each borough.

https://data.ny.gov/widgets/xywu-7bv9