Situated in eastern Hillsborough County between the communities of Seffner and Mango, the brand new Seffner-Mango Branch Library is a 15,000 square foot building with 35,000 new materials for a total collection of 75,000. Amenities include a large community room, study rooms, a separate children's department, a Friends of the Library bookstore, and a science room which will emphasize science education and provide students of all ages with unique experiences and learning opportunities. The Seffner-Mango Branch Library celebrated its Grand Opening on January 15, 2009 with a ribbon-cutting celebration that included County Commissioners and County Administrator Pat Bean.

The original Seffner-Mango Branch Library opened on December 28, 1998 as a 5,200 square foot storefront library next to Wal-Mart in the busy Mango Square with over 32,000 books, videos, and books on tape. In the following year, the library checked out over 114,000 pieces of library material, registered more than 2500 new customers, and filled 12,265 holds.

Seffner's history can be traced back to before 1842, making it one of Hillsborough County's earliest communities. Just southeast of Lake Thonotosassa and consisting of the present-day communities of Seffner and Dover, the area was originally known as Simmon's Hammock, after the Reverend Daniel Simmon who migrated from Georgia in 1829 to establish a Baptist mission near the lake. The building of Henry Plant's South Florida Railroad in 1883 made "boom towns" of many of the communities along its route through Hillsborough County, including Seffner and Mango, although Mango was originally homesteaded as early as 1849, over thirty years before the appearance of the first railroad tracks.

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