Each person in the US is a constituent of multiple regional legislators, from city council (or local versions) to Representatives and Senators (and President, sure).

I've found luck in starting with emailing the office of my lowest (closest) representative at the smallest unit of government, telling them my problem, and asking them who I can talk to about it. "Who's responsible for pothole repairs on (street that might be state or county controlled instead of the city)?" This puts the ambitions of the office to work. Oftentimes they will rather get credit for solving your problem and do work for you than just give you a phone number or email address, and in the event of a roadblock you can go back to them for more help. "Hey, I tried X but Y happened, got any other ideas?" Your state rep's communications intern doesn't just sit back alphabetizing checks from Walmart executives and police unions.