Harford County - Maryland - United States. https://en.wikipedia.org/wiki/Harford_County,_Maryland

According to the county's official website, the golden/yellow color represents the wealth of the county and the richness of its fields, while the blue wavy bands represent Deer Creek, Bynum Run, and Winters Run. Atop the shield is a two-handed forearm, the one holding a quill to symbolize the signing of the Bush Declaration, and the other holding a sword to symbolize Aberdeen Proving Ground.

The county motto, "At the Risque of Our Lives and Fortunes", are the final words of the Bush Declaration.

This flag has some great symbolism, and the coat of arms by itself is great. I just wish that this flag incorporated these elements in a way that was more readily visible at a distance.