St. Mary's County Chamber of Commerce 44200 Airport Rd. Suite B California, MD 20619 USA Phone: 301-737-3001  Official Website  Find Local Businesses The St. Mary's County Chamber of Commerce represents the diversity of the economy. Through effective programming, interactive Government Affairs activity and business advocacy, this organization plays a vital role in community and economic growth. From the rural agigricultural history to the growth of high tech military support, the St. Mary's County Chamber of Commerce is involved in sustaining and expanding a sound economy.

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