Settled in 1845 and incorporated in 1848, McKinney is the seat of Collin County. The city and county are named for Collin McKinney, a signer of the Texas Declaration of Independence and leader in the establishment of the Disciples of Christ church in Texas.

McKinney's historic downtown square has more than 100 businesses, including antiques, clothing shops, art galleries, and restaurants. The historic courthouse, built in 1874, is the centerpiece. It houses the McKinney Performing Arts Center.

A major draw here is Third Monday Trade Days, held the weekend before the third Monday of each month. Visitors can find more than 900 vendors selling antiques, arts and crafts at this open-air market on U.S. 380, two miles west of U.S. 75.

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