Discover Treasure Island: A Lakeside Community in Guadalupe County

Published: September 20, 2006

Treasure Island is a lakeside community located on an island in Lake McQueeney on the Guadalupe River about five miles northwest of Seguin in northwest central Guadalupe County. The upscale development began in the 1950s and offered lakefront lots to many retirees and second homeowners. Though the island suffered extensive damage in the flood of 1972, many residents rebuilt. In 1990 the population was 500. Treasure Island was again heavily flooded in 1998, but by 2000 the population had increased to 600.

Places:

Communities

The following, adapted from the Chicago Manual of Style, 15th edition, is the preferred citation for this entry.

Laurie E. Jasinski, “Treasure Island, TX,” Handbook of Texas Online, accessed May 19, 2026, https://www.tshaonline.org/handbook/entries/treasure-island-tx.

TID: HLT43

Original Publication Date:: September 20, 2006

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Place

Treasure Island

Currently Exists

Yes

Place Type

Town

Town Fields

Has post office: No
Is Incorporated: No

Belongs to

Guadalupe County

Coordinates

Latitude: 29.60432100°
Longitude: -98.03851500°

Population Counts

People	Year
172	2009

Commemorating 250 years of American independence through the stories, people, and places that shaped Texas and the nation.

As the United States approaches its 250th anniversary in 2026, Texans have a unique opportunity to reflect on the state’s role in the American story. Through exhibitions, programs, educational initiatives, and community events across Texas, Texas America250 encourages celebration, reflection, and commemoration at both local and statewide levels. At the Texas State Historical Association, we are proud to support this important moment through our mission-driven work in history education and public engagement, including Texas History Day, and we invite students, educators, and communities to explore this milestone in meaningful ways.

“

On July 4, 2026, we will celebrate the 250th anniversary of the adoption of the Declaration of Independence and the birth of the greatest nation in the history of the world. “We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness.” Long may these ideals live in the heart of every Texan and every American. May God bless all who have defended our freedoms that we enjoy each day. And God bless the United States of America.

Greg Abbott, Governor of Texas

Discover Treasure Island: A Lakeside Community in Guadalupe County

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Commemorating 250 years of American independence through the stories, people, and places that shaped Texas and the nation.

Commemorating 250 years of American independence through the stories, people, and places that shaped Texas and the nation.

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Find out more about this place from our Texas Almanac:

Commemorating 250 years of American independence through the stories, people, and places that shaped Texas and the nation.

Commemorating 250 years of American independence through the stories, people, and places that shaped Texas and the nation.

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Get Involved

Learn More

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