On its age, its old homes and the National Register, San Castle is more historic than 6% of U.S. towns, #449 of 638 in Florida. Its National Register listings hold the grade up; its share of homes from before 1940 pulls it down.
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HistoryA character grade: shown, never part of San Castle’s overall grade.
Few Florida towns list much on the Register (a typical Florida town has 0.0 per 10,000 residents, the U.S. 2.4), so San Castle’s 0.0 sits below most of its state (33% of Florida towns have fewer) while its 0 listings outnumber those of 23% of U.S. towns.
How sure. Graded on two of the three inputs, so a change in either one moves the letter more than it would with three. The pre-1940 share (±1.4 points) is firm at this size.
Founding year: our sources. Homes: Census ACS 2020–24. National Register: National Park Service, May 2026 list; each listing counted once (boundary changes and added documentation belong to their listing), and a historic district counts its contributing buildings. How TownRatings grades history →
What stands out about San Castle’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Prior to modern settlement, the high ground of the Atlantic Coastal Ridge was part of the greater Jaega tribe territory. The area lies just north of the historic Boynton Mound complex, a significant indigenous site that was largely destroyed in the early 20th century to provide shell fill for construction and development of Ocean Ridge.
Following World War II, the area was developed to meet the growing demand for housing in South Florida as well as for mango plantations. Platted primarily in the late 1950s, the community was designed as a residential subdivision featuring single-story homes consistent with the Florida Ranch architecture popular during that era.
San Castle is more historic than 6% of U.S. towns, #449 of 638 in Florida. The History grade combines the town’s founding era, the share of homes built before 1940 and its National Register listings. It’s a character grade, so it isn’t part of the overall grade. How it works.
How old are the homes in San Castle?
0.0% of San Castle’s homes were built before 1940 (Census estimate, ±1.4 points), against a typical 0.6% for a Florida town; the median home was built in 1967.
Founding dates: Wikidata, Wikipedia, the U.S. post office records of Blevins & Helbock (CC0) and the Census. Homes by year built: Census ACS 2020–24. National Register of Historic Places: National Park Service (list of May 22, 2026). Old photos, postcards and papers: Wikimedia Commons, the Library of Congress and other public archives, credited on each item’s page. Maps: U.S. Geological Survey historical topographic maps (via Esri) and Sanborn fire-insurance maps (Library of Congress). History text and census tables: Wikipedia (CC BY-SA 4.0). Places that used to be: USGS Geographic Names Information System (2021).
From Wikipedia and U.S. Geological Survey historical maps. Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.
