[citation needed] Its name is taken from the fast-growing malva family tree, Guacimo, native to Central America.

Guácimo was created on 26 June 1971 by Decreto 1769-G.[2] The town began with the construction of the railway built by West Indian employees of Minor Cooper Keith in the 1880s.

Keith built the so-called "Old Line" from Siquirres west through Guácimo to Carrillo before it was decided that the track line, instead of continuing from Carrillo directly to San José, should be built from Siquirres through Turrialba and Cartago along the Reventazon River.

[6] Longstanding English surnames in Guácimo include the Abrams, Anderson, Arboine, Bailey, Barnes, Berry, Blackwood, Budd, Burke, Burger, Byfield, Chambers, Channer, Clarke, Cook, Cowan, Crawford, Creed, Cyrus, Daily, Daniels, Davis, Douglas, Edwards, Fennell, Forbes, Gabriels, Gale, Gibson, Graham, Grant, Harris, Hemmings, Henry, Howard, Jones, Knowles, Leacock, Lee, Lovemore, McCarthy, McDonald, McFarlane, McGregor, Meyers, Myrie, Parchment, Peart, Philips, Porter, Poyser, Samuels, Slack, Stewart, Strackman, Taylor, Thomas, Valentine, Walcott, Watson, White, Williams, and Young families, as evidenced by the monthly active Linea Vieja local newspaper, current election registration sheets (known as the "padron electoral"), and 20th-century Jamaican Gleaner articles.

The district is covered by the following road routes: This Costa Rican location article is a stub.