In most US cities your legal sign size is buried in the zoning code and changes block to block. Pick your city, enter your address, and get a clear green/amber/red read before you pay for a sign the city makes you take down.
Every US city writes its own sign ordinance, tucked inside hundreds of pages of zoning code, and the limits change with your district — and sometimes whether your sign is lit. Owners routinely size a sign off the wrong number and get a rejected permit, a daily-accruing fine, or a removal order after the sign is already up. Big software skipped this because parsing thousands of city codes by hand never paid off. We read each city's actual ordinance so you can check your sign in seconds, for free, before you commit.