Found small green parakeet near Farmington Market

I found a small green parakeet perched on a fence post outside Farmington Market this afternoon around 2:30pm. It has bright emerald feathers, a yellow crown, and a tiny blue wing patch that shows when it fluffs its tail. It was wearing a faded orange plastic leg band with a faint number, and it seemed a little shy but chirped when I approached. I spotted it near the coffee shop's trash can by the entrance on Main Street, not far from the post office. I'm hoping to reunite it with its owner; it clearly belongs to someone and I hate to see it lonely.