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Henry Flagler's (1830-1913) railroad system expanded to the present-day St. Lucie County area in the 1890s, allowing the area's pineapple, fishing, seafood canning, and cattle industries to expand. Citrus became another prosperous industry in the area during the early 20th century. St. Lucie County was officially created from the southern portion of Brevard County in 1905. Indian River County separated to form its own county in 1925 and Martin County was established from the southeastern portion of St. Lucie County and the northern portion of Palm Beach County that same year. The western part of the county was used to form Okeechobee County in 1917.

St. Lucie County benefited from Florida's land boom in the 1920s, but was also affected by Florida's bust in 1929 and the Great Depression in the 1930s. During World War II, the U.S. Naval Amphibious Training Base was established in Fort Pierce, marking the beginning of the county's population boom that would last throughout the 1950s. St. Lucie County saw a population boom in the late 20th century. In the 21st century, the county was devastated by two major hurricanes in 2004 and from the financial collapse beginning in 2008.]]>
Exploring Florida Maps, Florida Center for Instructional Technology, University of South Florida, Tampa, Florida.]]> Rand McNally]]> ]]> Exploring Florida Maps, Florida Center for Instructional Technology, University of South Florida, Tampa, Florida.]]> Central Florida Railroad Depots Collection, RICHES of Central Florida.]]> Rand McNally.]]> Exploring Florida Maps, and is provided here by RICHES of Central Florida for educational purposes only.]]>
Miami Collection, Miami-Dade County Collection, RICHES of Central Florida.]]> Adobe Acrobat Reader]]> RICHES of Central Florida for educational purposes only.]]>