San Mateo is an

unincorporated community An unincorporated area is a region that is not governed by a local municipal corporation. Widespread unincorporated communities and areas are a distinguishing feature of the United States and Canada. Most other countries of the world either have ...

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, FL Micropolitan Statistical Area, which is inc ...

, 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 ( es, Río San Juan) is the longest river in the U.S. state of Florida and its most significant one for commercial and recreational use. At long, it flows north and winds through or borders twelve counties. The drop in eleva ...

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, with a southern terminus of the overlap with Florida State Roads 20 and 100.

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