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

Ontario Power Company

217 South Lemon Street

— 1919 —

Ontario Power Company Marker image. Click for full size.

Photographed by Duane and Tracy Marsteller, September 28, 2025

1. Ontario Power Company Marker

Inscription. This site was the location of the Ontario Power Company as early as 1907. According to the Daily Bulleting the offices opened in 1920 after a remodel and expansion. The building later became the main office for the Edison Company (now Southern California Edison) and the police station and jail for the Ontario Police Department.

Erected 1998 by City of Ontario, California. (Marker Number 35.)

Topics. This historical marker is listed in this topic list: Notable Buildings. A significant historical year for this entry is 1907.

Location. 34° 3.721′ N, 117° 38.97′ W. Marker is in Ontario, California, in San Bernardino County. It is at the intersection of South Lemon Avenue and East Emporia Street, on the left when traveling south on South Lemon Avenue. Touch for map. Marker is at or near this postal address: 217 S Lemon Ave, Ontario CA 91761, 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: Old City Hall (within shouting distance of this marker); Frankish Building (about 600 feet away, measured in a direct line); McCann Block Building (about 700 feet away); Nine Young Pepper Trees (about 700 feet away); The Old Post Office / Paul Williams Building (approx. 0.2 miles away); United States Post Office

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(approx. 0.2 miles away); Mule Car (approx. 0.2 miles away); Dr. O.S. Ensign House (approx. 0.2 miles away). Touch for a list and map of all markers in Ontario.

Photographed by Duane and Tracy Marsteller, September 28, 2025

2. Ontario Power Company Marker

Credits. This page was last revised on November 24, 2025. It was originally submitted on November 11, 2025, by Duane and Tracy Marsteller of Murfreesboro, Tennessee. This page has been viewed 62 times since then and 27 times this year. Photos: 1, 2. submitted on November 11, 2025, by Duane and Tracy Marsteller of Murfreesboro, Tennessee.