Sunnyvale is a rural, sparsely populated town in Dallas County, Texas, United States. It is the easternmost city completely within Dallas County. The population was 5,130 at the 2010 census.
The town now called Sunnyvale was inhabited by various Native American tribes in the years before the European conquest of the Americas. It became under the rule of Spain in the 18th century, very close to the boundary of Spanish and French territory (although this boundary was carried upward a bit in 1819; see Adams-Onís Treaty.) During this time, the area was relatively underdeveloped. However, some settlers migrated to Texas and would eventually settle in Sunnyvale. In 1821, the town became a possession of Mexico when Mexico received its independence from Spain. After the Texas Revolution, the area once again changed hands, under the Republic of Texas. This is when the town started to develop. During this time, settlers migrated to present-day Sunnyvale, naming the hamlet they founded Long Creek.1. In 1845 Texas became a United States state. More settlers migrated to the area. In the 1860s, the town was briefly part of the Confederate States of America. As more people arrived, eventually three new towns sprang up in the area: New Hope, Tripp, and Hatterville. New Hope was the most prosperous of these. It had many shops and stores, a fair called Gala Days, and a newspaper, the New Hope News. It was neighboring Mesquite’s biggest rival. This all ended in 1921, when a storm blew the town away 2. Many buildings were damaged and the prosperous days were over. From this year on to the 1950s, the four towns had no new developments, remaining stagnant. In the year 1953, the hamlets of Hatterville, New Hope, Long Creek, and Tripp merged under the name Sunnyvale. The name was chosen in a contest from a local school. Today, there are many reminders of Sunnyvale’s rich history, like the old New Hope School; the Tripp First Baptist Church, built in 1882; and many antique houses. The Long Creek Cemetery in southern Sunnyvale is over 150 years old, and the first recorded burial there is that of Leona Crownover Caldwell, dated October 2, 1855. There are also veterans from most major American wars, including the War of 1812, the Civil War (both Union and Confederate veterans), the World Wars, and others. Some of the oldest burials in the cemetery include James Truss and Priscilla Dulaney Truss, both born in 1799. In March 2012, Sunnyvale, Texas was named the whitest town in North Texas by D Magazine, and the power of that article was something that is still brought up today. The reason that Sunnyvale was named the whitest town in North Texas was based on an initial, U.S. District Judge Jerry Buchmeyern study that deducted that out of 2,228 residents in Sunnyvale, TX, that only 16 of them were African American. On December 26, 2015 the town was struck by an EF-4 tornado causing extensive damage to the Plantation RV park, the tornado then grew and moved northeast into Garland and Rowlett killing 12 people and injuring dozens.