Where palm trees are found in the United States

The map below illustrates the density of native palm species in the United States. As a side note, while palm trees can grow outside of this area, they will not be found in the wild outside of this zone.

Palms in the United States
bonap.org

Fourteen species of palms, belonging to 9 genera, are native to the United States. Only one occurs in the West; the others are naturally distributed in the southeastern and southern states—from North Carolina through Florida and the Gulf Coast into Texas and as far inland as Arkansas and southeastern Oklahoma. Some of them cover extensive areas. The greatest number of species occurs in Florida. The total of 14 is a relatively large representation since the southern tip of Florida is the only essentially tropical portion of our country. In addition, 2 Old World palms, the coconut, and the date have become naturalized; that is, in many areas where they have escaped from cultivation, the climate and soil have proved so suitable for their growth that they appear to be native.

Nine of our species are full-sized trees; three of the others are arborescent under certain conditions. The California washingtonia, cabbage palmetto, Texas palmetto, and Florida royal palm are probably the best known of our native tree palms. The remaining five, including two kinds of thatch palm, Florida silver palm, paurotis, and Florida cherry palm, are much less familiar, occurring in southern Florida or the Florida Keys. But two species—the widely distributed dwarf palmetto and the needle palm of restricted range— are not treelike.

The occurrence of place names that contain the word “Palms”

The occurrence of place names that contain the word "Palms"
Toponymic atlas of the U.S. (vividmaps.com)

Native palms:
Coccothrinax argentata (Jacq.) Bailey (Florida silver palm)
Paurotis wrightii (Griseb. & Wendl.) Britton (Paurotis palm)
Pseudophoenix sargentii Wendl (Florida cherry palm)
Rhapidophyllum hystrix (Pursh) H.Wendl. & Drude
Roystonea elata (Bartr.) F. Harper (Needle palm)
Sabal etonia Swingle (Scrub palmetto)
Sabal louisiana (Darby) Bomhard (Louisiana palmetto )
Sabal minor (Jacq.) Pers (Dwarf palmetto)
Sabal palmetto (Walt.) Lodd (Cabbage-palm)
Sabal texana (O. F. Cook) Becc (Rio Grande palmetto)
Serenoa repens (Bartr.) Small (Saw palmetto)
Thrinax microcarpa Sargent (Silvertop palmetto)
Thrinax parviflora Swartz (Broom palm)
Washingtonia filifera (Linden) Wendl (Fan palm)

Naturalized palms:
Cocos nucifera Linnaeus (Coconut tree)
Phoenix dactylifera Linnaeus (Date palm)

Number of native tree species per U.S. county

Number of native tree species per U.S. county
USTreeAtlas

Related post:
Native Oak Tree Ranges in the United States

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