Here's a map of the earliest sunset time: https://weather.com/science/weather-explainers/news/2018-12-... . There are parts of the US which have sunsets before 4:30, including some major population centers, but I don't know if I'd call them "large parts".
that map shows most major cities in North America have the sun set before 5PM (traditional work end time). New York, DC, Los Angeles, San Fransisco, Chicago.
New York, Boston, and Chicago all set before 4:30, a minimum of 10% of the population just there.
New York, Boston, and Chicago all set before 4:30, a minimum of 10% of the population just there.