The top reported proficiency rate is 87% in English language arts. The lowest is 82% in Math.
Original Research by School Decision on Old Union El
Old Union Elementary serves grades pre-K through fourth grade in Southlake, a high-income suburb in northeast Tarrant County. The school enrolls a small-to-mid-sized population with fairly even distribution across grade levels, drawing from a community that is predominantly white and Asian, with smaller shares of Hispanic and multiracial students.
In the most recent state testing data available, Old Union Elementary performed well. In English language arts, students in third and fourth grades showed strong proficiency, with large majorities meeting or exceeding grade-level standards. In math, results were similarly solid. When viewed as a school-wide picture across all tested grades and subjects, the school's overall proficiency rate places it in the top quartile among districts in Tarrant County. The data shows high attainment at the "meets" level and a substantial share reaching the "masters" level, though the school has only one year of comparable data and no trend information to assess whether performance is stable, improving, or shifting.
Southlake itself is an affluent, predominantly residential community built primarily around single-family homes and centered on Southlake Town Square, a mixed-use downtown district with retail, dining, and civic facilities. The median household income is high, home values are well above state and national benchmarks, and most adults hold bachelor's degrees or higher. The city functions as a bedroom community for the Dallas-Fort Worth area, with most residents commuting to jobs elsewhere. The housing market is expensive; monthly rent is substantial and home prices are significantly higher than state and national medians.
Carroll ISD, the district that operates Old Union Elementary, has made recent moves to reduce homeowner tax burdens. The district's total property tax rate has been cut substantially since 2021, and the 2025-26 rate is lower than the prior year, though the district still represents the majority of a residential owner's total property tax bill in this high-value market. In November 2025, voters approved an additional "golden penny" tax increase intended to support staff compensation and programs, projected to generate several million dollars in annual revenue that remains within the district rather than being recaptured by the state.
The district has also announced plans to consolidate its middle-grade structure by closing one of three intermediate schools in 2027-28, a change that will affect campus assignments for families with elementary and middle-grade children. Additionally, Carroll ISD was the site of prolonged public conflict over diversity and cultural programming in prior years; the district formally rejected a Cultural Competence Action Plan in 2021 as part of a lawsuit settlement and disbanded its diversity council. The district drew federal civil rights investigations during this period. Families considering the district may want to research the current approach to social-emotional learning and inclusive classroom practices directly with the school or district.
Old Union Elementary sits in a stable, highly resourced community. The school's test results show strong academic performance relative to its county peers. For families prioritizing academic proficiency in early elementary years and seeking a school in an affluent, educationally focused suburb, this represents a solid option, though the broader district context around cultural programming and recent structural changes warrants direct conversation with school leadership.
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