SIDNEY RICH IN ISTORY. ADVENTURE AND AGRICULTURE The Sidney Area Chamber of Commerce and Agriculture is proud to help businesses and the community Progress through Adversity Since 1916! Get involved: SidneyMT.com SIDNEY RICH IN ISTORY. ADVENTURE AND AGRICULTURE The Sidney Area Chamber of Commerce and Agriculture is proud to help businesses and the community Progress through Adversity Since 1916! Get involved: SidneyMT.com