Largest Schools in Thornton (2025)

Schools with the highest enrollment. Ranked by the Success Index (US) from official American data; 31 schools in Thornton, Colorado. Rank positions shown on each profile are within United States and Colorado.

#	School	Sector	Enrollment	Success Index (US)	Key result	Students
1	Riverdale Ridge High School Thornton · High · Grades 9–12	Public	1,784	46.6 Lower 50%	39.2% Free/reduced-price lunch	1,784
2	Thornton High School Thornton · High · Grades 9–12	Public	1,439	18.1 Lower 50%	12% Math proficiency	1,439
3	Rocky Top Middle School Thornton · Middle · Grades 6–8	Public	1,052	63.7 Top 50%	52% Math proficiency	1,052
4	Rodger Quist Middle School Thornton · Middle · Grades 6–8	Public	855	36.0 Lower 50%	24% Math proficiency	855
5	Thornton Middle School Thornton · Middle · Grades 6–8	Public	721	12.5 Lower 50%	10% Math proficiency	721
6	Century Middle School Thornton · Middle · Grades 6–8	Public	717	38.1 Lower 50%	33% Math proficiency	717
7	Discovery Magnet School Thornton · Elementary · Grades K–8	Public	692	60.7 Top 50%	23.4% Free/reduced-price lunch	692
8	West Ridge Elementary Thornton · Elementary · Grades PK–5	Public	690	58.4 Top 50%	45% Math proficiency	690
9	STEM Launch Thornton · Elementary · Grades K–8	Public	677	22.3 Lower 50%	22% Math proficiency	677
10	Shadow Ridge Middle School Thornton · Middle · Grades 6–8	Public	632	30.1 Lower 50%	21% Math proficiency	632
11	Brantner Elementary School Thornton · Elementary · Grades PK–5	Public	574	48.1 Lower 50%	42% Math proficiency	574
12	Explore Pk-8 Thornton · Elementary · Grades PK–8	Public	557	23.2 Lower 50%	22% Math proficiency	557
13	Silver Creek Elementary Thornton · Elementary · Grades K–5	Public	538	65.0 Top 50%	53% Math proficiency	538
14	Hunters Glen Elementary School Thornton · Elementary · Grades PK–5	Public	491	40.5 Lower 50%	36% Math proficiency	491
15	Tarver Elementary School Thornton · Elementary · Grades PK–5	Public	475	48.7 Lower 50%	40% Math proficiency	475
16	Eagleview Elementary School Thornton · Elementary · Grades K–5	Public	451	51.5 Top 50%	43% Math proficiency	451
17	Clayton Partnership School Thornton · Elementary · Grades K–8	Public	430	18.7 Lower 50%	23% Math proficiency	430
18	Stellar Elementary School Thornton · Elementary · Grades K–5	Public	418	31.1 Lower 50%	30% Math proficiency	418
19	Coronado Hills Elementary School Thornton · Elementary · Grades PK–5	Public	412	16.8 Lower 50%	9% Math proficiency	412
20	Academy High School Thornton · High · Grades 9–12	Public	399	22.3 Lower 50%	17% Math proficiency	399
21	Mapleton Expeditionary School of the Arts Thornton · High · Grades 9–12	Public	393	18.9 Lower 50%	12% Math proficiency	393
22	Thornton Elementary School Thornton · Elementary · Grades PK–5	Public	387	16.9 Lower 50%	12% Math proficiency	387
23	Woodglen Elementary School Thornton · Elementary · Grades PK–5	Public	383	29.9 Lower 50%	27% Math proficiency	383
24	Prairie Hills Elementary School Thornton · Elementary · Grades K–5	Public	378	60.3 Top 50%	50% Math proficiency	378
25	Meadow Community School Thornton · Elementary · Grades PK–8	Public	378	15.6 Lower 50%	15% Math proficiency	378
26	Riverdale Elementary School Thornton · Elementary · Grades PK–5	Public	372	30.2 Lower 50%	22% Math proficiency	372
27	Achieve Academy Thornton · Elementary · Grades PK–8	Public	370	15.6 Lower 50%	17% Math proficiency	370
28	McElwain Elementary School Thornton · Elementary · Grades K–5	Public	361	17.2 Lower 50%	14% Math proficiency	361
29	Skyview Elementary School Thornton · Elementary · Grades K–5	Public	326	40.3 Lower 50%	32% Math proficiency	326
30	Cherry Drive Elementary School Thornton · Elementary · Grades PK–5	Public	325	28.9 Lower 50%	27% Math proficiency	325
31	Mapleton Early Career Preparation Thornton · High · Grades 9–12	Public	306	17.6 Lower 50%	12% Math proficiency	306

Riverdale Ridge High School in Thornton leads the 2025 list of largest schools in Thornton with Enrollment 1,784. Of the 31 schools shown, 31 are public.

For the full picture see the wider Colorado largest schools rankings, every school on the Thornton page, or the comparison tool to put a shortlist side by side.

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Frequently asked questions

What is the best largest school in Thornton?

Riverdale Ridge High School in Thornton, Colorado ranks first among largest schools in Thornton with Enrollment 1,784 (Enrollment: 1,784).

How are largest schools in Thornton ranked?

Schools with the highest enrollment. Only schools eligible for the Success Index (US) are included; the index is shown alongside for context.

Are these 2025 rankings official?

No. They are computed by Success Tutoring from official American data (Urban Institute Education Data Portal (NCES CCD, EDFacts); NCES Common Core of Data). States set their own assessments and proficiency cut scores, so proficiency rates are most comparable within a state. Use the state rankings for like-for-like comparisons.