THE HISTORICAL
MARKER DATABASE
“Bite-Size Bits of Local, National, and Global History”
 
 
 
 
 
 
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Historical Markers in Ontario

 
Clickable Map of San Bernardino County, California and Immediately Adjacent Jurisdictions image/svg+xml 2019-10-06 U.S. Census Bureau, Abe.suleiman; Lokal_Profil; HMdb.org; J.J.Prats/dc:title> https://commons.wikimedia.org/wiki/File:Usa_counties_large.svg San Bernardino County, CA (454) Inyo County, CA (219) Kern County, CA (390) Los Angeles County, CA (2425) Orange County, CA (533) Riverside County, CA (365) La Paz County, AZ (33) Mohave County, AZ (125) Clark County, NV (263)  SanBernardinoCounty(454) San Bernardino County (454)  InyoCounty(219) Inyo County (219)  KernCounty(390) Kern County (390)  LosAngelesCounty(2425) Los Angeles County (2425)  (533) Orange County (533)  RiversideCounty(365) Riverside County (365)  LaPazCountyArizona(33) La Paz County (33)  MohaveCounty(125) Mohave County (125)  ClarkCountyNevada(263) Clark County (263)
San Bernardino is the county seat for San Bernardino County
Ontario is in San Bernardino County
San Bernardino County (454)  ►
ADJACENT TO SAN BERNARDINO COUNTY
Inyo County (219)  ►
Kern County (390)  ►
Los Angeles County (2425)  ►
Orange County (533)  ►
Riverside County (365)  ►
La Paz County, Arizona (33)  ►
Mohave County, Arizona (125)  ►
Clark County, Nevada (263)  ►
 
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1 ► California, San Bernardino County, Ontario — Armsley Square Historic District — 119 - 509 West Armsley Square — 1924 —
John S. Armstrong, founder of Armstrong Nurseries, purchased the 20 acres on the Southwest corner of Euclid Avenue and Sixth Street in order to establish a planned neighborhood adjacent to the site for his mansion. The tract was developed with a 40 . . . — — Map (db m151117) HM
2 ► California, San Bernardino County, Ontario — 24 — Bethel Congregational Church — 536 North Euclid Avenue — 1912 —
Constructed in 1912, this church building is one of Ontario's best examples of Gothic Revival architecture. The church is constructed of split stone and features numerous arched lancet stained glass windows. The stately corner tower with an arched . . . — — Map (db m288403) HM
3 ► California, San Bernardino County, Ontario — 7 — Carriage House — 456 West Carriage Alley — 1911 —
One of Ontario's few remaining carriage structures, the Carriage house was built in 1911 at a time of transition from horse-drawn carriages to the automobile. W.O. Campbell built the structure as a garage and stable. It was designed to accommodate . . . — — Map (db m287939) HM
4 ► California, San Bernardino County, Ontario — Central School — El Morado Court Historic District — 1934 —
Central School was founded in 1887 and was Ontario’s first public school. This is the third school building on this site and was designed by Harry L. Pierce. It was built in 1934 as a WPA project. It is one of the finest examples of Art Deco . . . — — Map (db m161078) HM
5 ► California, San Bernardino County, Ontario — College Park Historic District —
115 - 431 East Fourth Street 116 - 224 East Harvard Place 116 - 328 East Princeton Street 1130 - 1158 North Columbia Avenue 1914 Lydia Belle Ford subdivided the College Park Tract into 48 lots on September 11, 1914. It was one of the . . . — — Map (db m151116) HM
6 ► California, San Bernardino County, Ontario — 5 — Dr. O.S. Ensign House — 304 South Laurel Avenue — 1893 —
This Eastlake home with stick style features was built in 1893 by architect and contractors John Gerry and Robert Manley for Doctor and Mrs. O.S. Ensign. It was used as both medical offices and residence by Dr. Ensign and later Dr. C. Sheppard. F.E. . . . — — Map (db m288202) HM
7 ► California, San Bernardino County, Ontario — El Morado Court Historic District — 117 - 330 East El Morado Court; 116 - 437 East H Street; 117 - 415 North Side of East G Street — 1922 —
The "Model Colony" The El Morado Tract was developed between 1912 and 1922. Two stone pillars with Egyptian Revival style caps mark the entrance to the neighborhood. El Morado Court was originally designed for Model-T and horse-and-buggy passage, . . . — — Map (db m151107) HM
8 ► California, San Bernardino County, Ontario — 5 — Euclid Avenue School — 1120 South Euclid Avenue — 1938 —
Euclid School was founded in 1912 and this is the third building on this site. This building was built in 1938 as a WPA project. It is one of the finest examples of Spanish Colonial Revival style architecture in Ontario and one of Ontario's three . . . — — Map (db m288311) HM
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9 ► California, San Bernardino County, Ontario — Founder’s Garden — Ontario, California —
Ontario's history has been shaped by pioneers who built a new community by combining their own knowledge and skills with the energy and determination generated by the promise of this extraordinary landscape. George Chaffey, Ontario's founder, . . . — — Map (db m149487) HM
10 ► California, San Bernardino County, Ontario — 12 — Frankish Building — 200 South Euclid Avenue — 1916 —
The Charlemagne Apartments, which occupy the second and third stories, are part of the original design and construction of the Frankish Building. These two to four room apartments were considered to be “high class and modern living” at the time of . . . — — Map (db m288151) HM
11 ► California, San Bernardino County, Ontario — George Chaffey, Jr. — 1848-1932 —
Founder of Ontario Engineer, Developer, Inventor His vision for a thriving model colony laid the foundation for all that Ontario has become. John Edwards Svenson, FNSS Sculptor — — Map (db m150971) HM
12 ► California, San Bernardino County, Ontario — Graber Olive House — Olive Mill —
This mill was used in the early days of California. Olives were placed in the large vessel and crushed by the solid granite wheels, weighing about 12,000 lbs. The crushed olives were pushed into burlap sacks that were placed over the gate. The . . . — — Map (db m127363) HM
13 ► California, San Bernardino County, Ontario — Guasti —
Standing here in 1904, you would see the Guasti Stone Cellar to the southeast. The cellar was built of granite stone. This stone was all brought down to the valley from the foothills in Alta Loma — a distance of some twelve to fourteen miles. The . . . — — Map (db m129302) HM
14 ► California, San Bernardino County, Ontario — Hitching Post — Ontarios' First Library —
This hitching post was used by Ontarios' first library patrons for their horses. It stood for many years beside Ontarios' first library erected in 1906 at the corner of "D" St. and Euclid. Presented to us by Alberta Schaefer, . . . — — Map (db m257674) HM
15 ► California, San Bernardino County, Ontario — 88 — James A. Finley House — 413 West Sixth Street — 1938 —
Designed in the Minimal Traditional style, this home was constructed for James A. Finley who was the General Manager of the Exchange Orange Products (Sunkist) plant in Ontario. As a chemical engineer, Finley made significant contributions to the . . . — — Map (db m287936) HM
16 ► California, San Bernardino County, Ontario — 26 — McCann Block Building — 108 South Euclid Avenue — 1917 —
In 1917, Lewis E. McCann hired Campbell Construction Company to construct this classic Commercial style building which housed his hardware store. It was built with reinforced concrete for $20,000 and sold for $30,000 in 1923. This early 20th . . . — — Map (db m288149) HM
17 ► California, San Bernardino County, Ontario — Mule Car — 1888 - 1895 —
From August 14, 1888, to September 24th, 1895, the Ontario & San Antonio Heights R.R. Company’s gravity mule car transported citizens up-and-down Euclid Avenue from Holt Boulevard to 24th Street. The cars were designed by John H. Tayes. . . . — — Map (db m37512) HM
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18 ► California, San Bernardino County, Ontario — Nine Young Pepper Trees —
This is one of nine young pepper trees purchased and planted on Euclid Avenue by the students of Ontario's nine public elementary schools in observance of Arbor Day, March 8, 1954. The young trees were planted as replacements for mature trees . . . — — Map (db m124287) HM
19 ► California, San Bernardino County, Ontario — 51 — Oakley House — 1007 North Euclid Avenue — 1887 —
Built in the Stick style of architecture by Abraham Oakley, this home is one of Ontario's finest examples of a Victorian Era citrus farmhouse. The home was occupied by the Oakley family, including Herbert Oakley, a prominent real estate developer, . . . — — Map (db m287937) HM
20 ► California, San Bernardino County, Ontario — 2 — Old City Hall — 225 South Euclid Avenue — 1937 —
The Mediterranean Revival building with Italian Villa styling was built in 1937 as part of the Works Project Administration (WPA). Designed by DeWitt Mitcham, the building served as City Hall until 1979. It was built on the site of the Ontario . . . — — Map (db m288343) HM
21 ► California, San Bernardino County, Ontario — 38 — The Old Post Office / Paul Williams Building — 119 West Transit Street — 1926 —
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 . . . — — Map (db m288150) HM
22 ► California, San Bernardino County, Ontario — 74 — Ontario Baseball Park — Jay Littleton Ball Park — Built 1935-1937 —
Constructed in 1935 at a cost of $30,000, and was a WPA project. The ball park was the spring training home of Los Angeles Angels of the Pacific Coast League from 1937 until 1942. The first game was played on March 14, 1937 between the Angels . . . — — Map (db m252129) HM
23 ► California, San Bernardino County, Ontario — 6 — Ontario Laundry Company — 401 North Euclid Avenue — 1940 est. —
This site was home to the Ontario Laundry Company beginning in 1896. In 1940, Southern Service, an affiliate of the laundry company, built this Streamline Moderne architectural style building for a cost of $35,000. The front patio area was . . . — — Map (db m287938) HM
24 ► California, San Bernardino County, Ontario — 21 — Ontario Masonic Hall — 231-233 North Euclid Avenue — 1904 —
Constructed by the Ontario Masonic Lodge in the Neoclassical Commercial style of architecture, white brick veneer and intricate dentil details on the cornice enhances the front façade. Accentuating the second story is a decorative triangular . . . — — Map (db m287940) HM
25 ► California, San Bernardino County, Ontario — 35 — Ontario Power Company — 217 South Lemon Street — 1919 —
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 . . . — — Map (db m288312) HM
26 ► California, San Bernardino County, Ontario — Ontario Town Square —
Ontario Town Square reflects the City's appreciation for the personality and charm of our community. The things that originally drew people to Ontario are still here. Ontario Town Square honors Ontario's history by providing snapshots from our past . . . — — Map (db m150912) HM
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27 ► California, San Bernardino County, Ontario — Rosewood Court Historic District — 118 - 430 East Rosewood Court; 116 - 432 East J Street — 1924 —
The Rosewood Tract was developed from 1925 to the beginning of World War II during Ontario's transition from an agricultural colony to a city. Rosewood Court's diverse architectural styles depict the influence of European architecture during World . . . — — Map (db m151112) HM
28 ► California, San Bernardino County, Ontario — 39 — United States Post Office — 123 West Holt Boulevard — 1940 —
The Downtown Post Office was designed in a modern Spanish Revival architectural style by Los Angeles architect, Louis A. Simon, and constructed with funds from the Works Progress Administration (WPA). There are two vividly-colored murals in the . . . — — Map (db m288194) HM
29 ► California, San Bernardino County, Ontario — WCTU Fountain —
This fountain was built by the Women's Christian Temperance Union and dedicated to this City of Ontario on July 4th 1908, to provide the town with "a drinking fountain where only the pure, sparkling water can be had at any time by the . . . — — Map (db m37513) HM
 
 
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Nov. 11, 2026