Historical Marker Program

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100th Meridian Oklahoma/Texas State Line

Harmon County
Location: on US-62, four miles west of Hollis
Coordinates: 34.681614, -100.000335
Material: Granite
Sponsor(s): 100th Meridian Chapter Daughters of the American Revolution
Topics: Early Statehood, 1907–1941; Government; Westward Expansion, 1803–1861

The Adams-Onís Treaty (1819) designated the 100th Meridian as the boundary between the United States and New Spain (Spanish Mexico). The location of the 100th Meridian remained under dispute after the admission of Texas into the Union in 1845. In 1927, the US Supreme Court confirmed the 100th Meridian as the Oklahoma-Texas border and assigned engineer Samuel S. Gannett to locate and mark the state line.

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La Casa School

Harmon County
Location: on US-62, three miles east of Hollis
Material: Granite
Topics: Early Statehood, 1907–1941; Education

The La Casa School was formed in 1925 by consolidating three schools: Mesquite, Star Valley, and Bearden. The first class graduated in 1928. The school closed in 1957.

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Ron School

Harmon County
Location: on OK-30, seven miles north of Hollis
Material: Granite
Topics: Early Statehood, 1907–1941; Education

The Ron School began in 1939 with the consolidation of schools at Dryden, McKnight, Metcalf, and Teacross. The last class graduated in 1964 when the school became part of the Hollis Public Schools.

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Vinson

Harmon County
Location: on OK-9 in Vinson
Topics: Early Statehood, 1907–1941; Education; Government; Modern Period, 1982–present

A post office was established here on August 20, 1903, named for Henry B. Vinson, the owner of the townsite. The Vinson School closed in 1964 after serving children for decades from the surrounding communities of Cave Creek, Independence, Union Grove, Madge, Opal, Carl, Sulphur, Union Hill, Hurst, Hackberry, and Elm Valley.