Best High Schools in Zip Code 80229

Zip code 80229 in Thornton, Colorado is home to five high schools serving grades 9–12, with a combined enrollment of about 2,436 students and a high-poverty, high-need population where free/reduced lunch rates average 77%. Among these schools, Academy High School stands out as the strongest academic performer, with a graduation rate of 87.5%, the lowest dropout rate in the area at 0.6%, and SAT reading/writing proficiency at 49% — far above its district average. Mapleton Early Career Preparation boasts the highest graduation rate at 92.4%, surpassing both the state rate and its own district, even though its test scores are only moderate. In contrast, Thornton High School, the largest traditional school with 1,439 students, has seen a dramatic decline, sliding to the 2nd percentile statewide and posting only 6% math proficiency on the 11th-grade SAT.

Chronic absenteeism is a pervasive challenge across the zip code, with a weighted average of 55.4% — nearly double the state rate of 28.4%. New America School - Thornton shows the most acute risk indicators: a 22.2% graduation rate, a 26.4% dropout rate, and 80.5% chronic absenteeism. North Valley School for Young Adults also reports very high absenteeism and a 45.9% graduation rate, but neither alternative school has recent state test scores. Math proficiency is universally weak across all traditional schools, ranging from just 6–13% at Thornton to 11–28% at Academy, leaving math as the single most urgent academic need in the area.

District reputation can be misleading. Adams 12 Five Star Schools ranks in the 57th percentile, yet Thornton High School sits at the 2nd percentile, while Mapleton School District No. 1 ranks near the bottom at the 9th percentile, and its two schools outperform their district averages significantly. High graduation rates do not always align with high test scores — Mapleton Early Career Prep graduates students well but shows modest academics, while Academy combines both. Poverty does not determine outcomes: all five schools face similar economic challenges, yet Academy and Mapleton Early Career Prep achieve far better results than Thornton or New America. For parents, the key takeaway is that school-level data varies dramatically within this zip code, so it is essential to look beyond district ratings and evaluate each school individually.