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San Dionysio

Ghost town · Yuma County, Arizona

Picacho Peak quadrangle, USGS topographic map (1945, 1:62,500)
Picacho Peak quadrangle, USGS topographic map (1945, 1:62,500) · U.S. Geological Survey, Historical Topographic Map Collection · Public domain

San Dionysio is a ghost town in Yuma County, Arizona. It is one of 11 former communities in Yuma County on the federal names register. That ranks the county 5th among the 15 Arizona counties with a vanished settlement on record.

The U.S. Geological Survey lists San Dionysio as a historical populated place on the Bard topographic quadrangle: the name is no longer in official use for a community, whether the settlement was abandoned, absorbed into a neighbouring town or renamed. The recorded location is 32.7514° N, 114.5675° W.

Key facts

USGS quadrangleBard
Elevation137 ft
Nearest living townEl Prado Estates, AZ
Distance to it4.1 miles
GNIS feature ID44989
Coordinates32.75143, -114.56745

Open the location on a map

Then and now

Drag the slider: the old USGS map on the left, the same ground from the air today on the right. Both cover the same 1.9-mile square centred on the recorded location.

San Dionysio today, aerial view
Picacho Peak quadrangle, USGS topographic map (1945, 1:62,500)

Left: Picacho Peak quadrangle, USGS topographic map (1945, 1:62,500), U.S. Geological Survey, Historical Topographic Map Collection. Right: The same ground today: NAIP aerial imagery, USDA Farm Service Agency, National Agriculture Imagery Program (via USGS). Both public domain.

What's there now

San Dionysio is no longer a community in its own right. The nearest living town is El Prado Estates, AZ (population 390), about 4.1 miles away in a straight line, and the site sits at roughly 137 feet above sea level. The aerial view above shows what covers the ground today. Much of the land around former townsites is private; check access before you visit.

Nearby places

Questions

Where is San Dionysio?

San Dionysio is in Yuma County, Arizona, at 32.7514, -114.5675.

How many ghost towns are in Yuma County?

Yuma County, Arizona has 11 ghost towns on record at Wayfarrow.

Sources and licences

Facts marked "approximately" carry an uncertain date in the source. Text on this page is generated from the sources above; no encyclopedia prose is copied. Last updated 2026-11-05.