[3] Oldham County is included in the Amarillo, TX Metropolitan Statistical Area.

[4] Oldham County is primarily ranch and farm land, with many thousands of acres planted in wheat, the major crop.

The former county seat of Tascosa is located at a crossing of the Canadian River, north of Vega.

The border between the two states was originally defined as the 103rd meridian, but the 1859 survey that was supposed to mark that boundary mistakenly set the border between 2.29 and 3.77 miles too far west of that line, making the current towns of Farwell, Texline and the eastern part of Glenrio appear to be within the State of Texas.

New Mexico's short border with Oklahoma, in contrast, was surveyed on the correct meridian.

The disputed strip, hundreds of miles long, includes parts of valuable oilfields of the Permian Basin.

[6] The question was once settled in favor of Texas by the intervention of President William Howard Taft, at the request of Senator John Villiers Farwell, whose three-million-acre XIT Ranch would have been diminished by New Mexico's claim.

In terms of ancestry, 25.2% were of German, 14.1% were of Irish, 10.4% were of English, 4,7% were of American, 3,3% were of French, 2,9% were of Dutch.