San Mateo is an

unincorporated community An unincorporated area is a parcel of land that is not governed by a local general-purpose municipal corporation. (At p. 178.) They may be governed or serviced by an encompassing unit (such as a county) or another branch of the state (such as th ...

Putnam County, Florida Putnam County is a county located in the northern part of the state of Florida. As of the 2020 census, the population was 73,321. Its county seat is Palatka. Putnam County comprises the Palatka, Florida Micropolitan Statistical Area, which i ...

, United States, located just southeast of the city of Palatka. It is on the east shore of the

St. Johns River The St. Johns River () is the longest river in the U.S. state of Florida and is the most significant one for commercial and recreational use. At long, it flows north and winds through or borders 12 counties. The drop in elevation from River s ...

between buoys 12 and 15; stretching from Buzzard Island to the entrance to Dunn's Creek. The main road through San Mateo is

US Route 17 U.S. Route 17 or U.S. Highway 17 (US 17), also known as the Coastal Highway, is a north–south United States Numbered Highway that spans in the Southeastern United States. It runs close to the Atlantic Coast for much of its len ...

, with a southern terminus of the overlap with Florida State Roads 20 and

100 100 or one hundred (Roman numeral: C) is the natural number following 99 and preceding 101. In mathematics 100 is the square of 10 (in scientific notation it is written as 102). The standard SI prefix for a hundred is " hecto-". 100 is the b ...

Geography

San Mateo is located at , with an elevation of .San Mateo Community Profile
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References

Unincorporated communities in Putnam County, Florida Unincorporated communities in Florida Former municipalities in Florida Populated places on the St. Johns River {{PutnamCountyFL-geo-stub