Ontario in San Bernardino County, California — The American West (Pacific Coastal)

The Old Post Office
⎯⎯⎯
Paul Williams Building

119 West Transit Street

— 1926 —

The Old Post Office/Paul Williams Building Marker image. Click for full size.

Photographed by Duane and Tracy Marsteller, September 28, 2025

1. The Old Post Office/Paul Williams Building Marker

Inscription. Designed by renowned architect Paul Revere Williams, this former post office building was crafted in the Italian Renaissance Revival style with Spanish Colonial and Mission Revival style influences. The subtle details that await discovery include decorative tile at the building base, wrought iron grillwork, quatrefoil on the gable end, and wood beams on the ceiling. Charles Latimer, proprietor of the San Antonio Orchard Company, leased the building to the U.S. Postal Service until 1941.

Erected 1998 by City of Ontario, California. (Marker Number 38.)

Topics. This historical marker is listed in these topic lists: Architecture • Communications. A significant historical year for this entry is 1926.

Location. 34° 3.755′ N, 117° 39.133′ W. Marker is in Ontario, California, in San Bernardino County. It is at the intersection of West Transit Street and South Laurel Avenue, on the left when traveling west on West Transit Street. Touch for map. Marker is at or near this postal address: 119 W Transit St, Ontario CA 91762, United States of America. Touch for directions.

Regionally, this marker is in Greater Los Angeles,

in the Inland Empire,

in the Peninsular Ranges,

and specifically in the Transverse Ranges.

It is also in the American Southwest.

Globally, it is in North America,

on the Ring of Fire,

in the Pacific Rim,

in the Western Hemisphere,

in the Western World,

and in the Anglosphere.

Historically, it finds itself in what was once New Spain

and also Mexico’s Alta California.

Other nearby markers. At least 8 other markers are within walking distance of this marker: United States Post Office (within shouting distance of this marker); Frankish Building (within shouting distance of this marker); McCann Block Building (about 300 feet

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away, measured in a direct line); Nine Young Pepper Trees (about 500 feet away); Dr. O.S. Ensign House (about 600 feet away); Old City Hall (about 600 feet away); Mule Car (about 800 feet away); Ontario Power Company (approx. 0.2 miles away). Touch for a list and map of all markers in Ontario.

Also see . . . Paul R. Williams. Wikipedia entry on the noted African American architect, who primarily practiced in Southern California. (Submitted on November 9, 2025, by Duane and Tracy Marsteller of Murfreesboro, Tennessee.)

Photographed by Duane and Tracy Marsteller, September 28, 2025

2. The Old Post Office/Paul Williams Building Marker

Marker is under the left light fixture.

The Old Post Office/Paul Williams Building image. Click for full size.

Photographed by Duane and Tracy Marsteller, September 28, 2025

3. The Old Post Office/Paul Williams Building

Credits. This page was last revised on January 3, 2026. It was originally submitted on November 9, 2025, by Duane and Tracy Marsteller of Murfreesboro, Tennessee. This page has been viewed 43 times since then and 19 times this year. Photos: 1, 2, 3. submitted on November 9, 2025, by Duane and Tracy Marsteller of Murfreesboro, Tennessee.

The Old Post Office⎯⎯⎯Paul Williams Building

119 West Transit Street

— 1926 —

The Old Post Office
⎯⎯⎯
Paul Williams Building