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A Partner Of The Washington County Tourism Promotion Agency The Washington County Chamber of Commerce has grown into the largest business association in Washington County and is the largest Chamber of Commerce in Southwestern Pennsylvania. From small businesses to the countys largest employer our goal is to promote and advance the interests of our members. The Great Energy Gathering XI Wednesday March 19Hilton Garden Inn Pittsburgh Southpointe Join us for the 11th annual MEGA MIXER hosted by 35 chambers of commerce business associations and energy organizations at the Hilton Garden Inn Southpointe. Register Municipal Leaders Breakfast Thursday March 27Chartiers Township Community Center730 a.