In the early years of the 1900s, agriculture was the mainstay of the county economy. The chief agricultural products were Irish potatoes and sweet potatoes. The county farmers raised so many Irish potatoes in the early 1920s that they were shipped out numerous railroad boxcars, full of potatoes, during the summer months of those years. Small businesses, such as the Effingham Canning Company and Potato Barrel manufacturing mills, became big businesses. The Effingham Canning Company did not last long. It was established in 1918 at the site of the former Savannah Atlanta
Railroad Locomotive Repair Shop in Springfield. This site today would be located across the road from Georgia Highway Department Maintenance Building on Georgia Highway 21, south of Springfield. A later canning company operated in the 1940s at the old elementary school grounds in Springfield. In the early 21st century, Effingham County has had unprecedented demand for industrial locations. Interest in industrial development has been spurred by the area's high population growth, tremendous growth at the Georgia ports and the ever-growing economy of coastal Georgia. Contributors include the military, aerospace industry and a diversified manufacturing base. The Savannah area is home to Gulfstream Aerospace and Hunter Army Airfield. The Effingham County Industrial Park has announced several new tenants since 2005. In 2007 it became the site of EFACEC Group, a Portuguese-based transformer manufacturer for their North and Central America operations. The U.S. factory is located in Rincon, Georgia and produces both core and shell technology power transformers. Other businesses include the Flint River Services refrigerated storage, ValuePart distribution center, as well as expansions of several existing industries in the park. The site is ideally located on a four-lane divided highway only from Interstate 95 and within of the Georgia Ports, the Savannah International Airport and the historic City of Savannah. The Effingham Industrial Development Authority acquired approximately for development. The acquisitions include a tract of approximately adjacent to Interstate 16 and an additional tract on Interstate 16 seven miles from Interstate 95. Both tracts are within of the Georgia Ports Authority, and within of the Chatham County Mega-Site (formerly known as the DaimlerChrysler site) at the strategic intersection of Interstates 95 and 16. A potential of of light manufacturing and/or Distribution Center/ Warehousing space exists at this site. Another recent acquisition is the former Research Forest Tract. Approximately in size, this will be a "legacy" development to include commercial, executive office, heavy industrial, light industrial, professional service, research and recreational land uses. The site comprises three separate tracts of land six rail miles from the
Georgia Ports Authority, with planned access to the Savannah River Parkway, Norfolk Southern mainline rail and CSX mainline rail. The property is being master planned. The development is planned to attract research and development, assembly operations, headquarters and other low-impact operations. Industry in Effingham County includes paper manufacturing—Georgia Pacific (Savannah River Mill), high-precision turbine blade production—Doncasters, aluminum geodesic dome production—Temcor, concrete pipe manufacturing—Hanson, customized business jet interiors—Edward's Interiors, electrical distribution power transformer production—EFACEC PT, among many others. ==Transportation==