Twenty boroughs and counties, three licensing systems, one phone number. Select an area to see the local rules and the guide for that area.
§ 01
Select an area
Tap an area to see who licenses plumbers there, who issues permits, and what's typical about local buildings.
New York City
New York suburbs
New Jersey
Boundaries: U.S. Census Bureau, generalized. Licensing and permit information reviewed November 4, 2026. Rules change, so confirm with the local authority before work starts.
What it shows: About 19.8 million people live in the 20 areas this site covers. Brooklyn and Queens alone are larger than any suburban county, but Long Island (Nassau + Suffolk) together approaches 3 million residents.
Units
Residents (people)
Geography
5 NYC boroughs, 5 NY suburban counties, 10 NJ counties
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