Local governments and public services, such as police and county elections departments, offer precinct searches on their websites. For example, both the New York City Police Department and the Dallas County Elections Department offer precinct searches which allow users to search for their precincts by address.
The New York City Police Department's precinct finder works by clicking on the user's borough on the interactive map and then entering the home address. The Dallas County Elections Department's precinct finder works similarly, although users only enter their addresses and zip codes. The sources providing precinct finders may vary, but government agencies offer reliable precinct information.