Quay County was created 28 January 1903. Tucumcari is the county seat. Quay was named for Matthew S. Quay, United States Senator to Pennsylvania. Senator Quay was a leader is bringing statehood to New Mexico Territory. Fishing is the main sports activity in the county.
Tourism plays an important role.
Union County was created 13 February 1893. The county seat is Clayton. Union County was formed from parts of Colfax, Mora, and San Miguel Counties. Researchers might check these related counties for resources. The old Santa Fe Trail traverses Union County.