Largest Schools in North Clackamas SD 12 (2025)

Schools with the highest enrollment. Ranked by the Success Index (US) from official American data; 30 schools in North Clackamas SD 12, Oregon. Rank positions shown on each profile are within United States and Oregon.

#	School	Sector	Enrollment	Success Index (US)	Key result	Students
1	Adrienne C. Nelson High School Happy Valley · High · Grades 9–12	Public	1,536	26.1 Lower 50%	58.5% Free/reduced-price lunch	1,536
2	Clackamas High School Clackamas · High · Grades 9–12	Public	1,280	56.1 Top 50%	50% Math proficiency	1,280
3	Happy Valley Middle School Happy Valley · Middle · Grades 6–8	Public	1,158	64.7 Top 50%	65% Math proficiency	1,158
4	Putnam High School Milwaukie · High · Grades 9–12	Public	1,060	44.6 Lower 50%	34% Math proficiency	1,060
5	Rock Creek Middle School Clackamas · Middle · Grades 6–8	Public	889	50.8 Top 50%	49% Math proficiency	889
6	Milwaukie High School Milwaukie · High · Grades 9–12	Public	874	31.9 Lower 50%	17% Math proficiency	874
7	Alder Creek Middle School Milwaukie · Middle · Grades 6–8	Public	810	40.0 Lower 50%	34% Math proficiency	810
8	Rowe Middle School Milwaukie · Middle · Grades 6–8	Public	747	32.6 Lower 50%	25% Math proficiency	747
9	Scouters Mountain Elementary Happy Valley · Elementary · Grades K–5	Public	568	58.1 Top 50%	60% Math proficiency	568
10	Beatrice Morrow Cannady Elementary Damascus · Elementary · Grades K–5	Public	506	39.2 Lower 50%	58.3% Free/reduced-price lunch	506
11	Happy Valley Elementary School Happy Valley · Elementary · Grades K–5	Public	491	63.5 Top 50%	66% Math proficiency	491
12	Oregon Trail Elementary School Clackamas · Elementary · Grades K–5	Public	455	48.1 Lower 50%	42% Math proficiency	455
13	Mount Scott Elementary School Happy Valley · Elementary · Grades K–5	Public	416	56.4 Top 50%	57% Math proficiency	416
14	Whitcomb Elementary School Milwaukie · Elementary · Grades K–5	Public	415	21.6 Lower 50%	14% Math proficiency	415
15	Milwaukie El Puente Elementary School Milwaukie · Elementary · Grades K–5	Public	408	43.0 Lower 50%	42% Math proficiency	408
16	Sunnyside Elementary School Clackamas · Elementary · Grades K–5	Public	402	41.9 Lower 50%	41% Math proficiency	402
17	Verne A Duncan Elementary School Happy Valley · Elementary · Grades K–5	Public	400	44.1 Lower 50%	42% Math proficiency	400
18	Ardenwald Elementary School Milwaukie · Elementary · Grades K–5	Public	396	41.4 Lower 50%	37% Math proficiency	396
19	Bilquist Elementary School Milwaukie · Elementary · Grades K–5	Public	373	49.5 Lower 50%	47% Math proficiency	373
20	View Acres Elementary School Milwaukie · Elementary · Grades K–5	Public	367	46.4 Lower 50%	42% Math proficiency	367
21	Spring Mountain Elementary School Happy Valley · Elementary · Grades K–5	Public	350	62.5 Top 50%	62% Math proficiency	350
22	New Urban High School Milwaukie · High · Grades 9–12	Public	320	27.5 Lower 50%	10% Math proficiency	320
23	Riverside Elementary School Milwaukie · Elementary · Grades K–5	Public	311	35.8 Lower 50%	31% Math proficiency	311
24	Clackamas Middle College Happy Valley · High · Grades 9–12	Charter	305	48.5 Lower 50%	32% Math proficiency	305
25	Lewelling Elementary School Milwaukie · Elementary · Grades K–5	Public	282	29.2 Lower 50%	27% Math proficiency	282
26	Milwaukie Academy of the Arts Milwaukie · High · Grades 9–12	Charter	281	52.1 Top 50%	15% Math proficiency	281
27	Oak Grove Elementary Milwaukie · Elementary · Grades K–5	Public	262	29.9 Lower 50%	32% Math proficiency	262
28	Linwood Elementary School Milwaukie · Elementary · Grades K–5	Public	259	30.2 Lower 50%	22% Math proficiency	259
29	Cascade Heights Public Charter School Milwaukie · Elementary · Grades K–8	Charter	228	52.4 Top 50%	57% Math proficiency	228
30	Sojourner School Milwaukie · Elementary · Grades K–5	Public	159	68.5 Top 25%	72% Math proficiency	159

Adrienne C. Nelson High School in Happy Valley leads the 2025 list of largest schools in North Clackamas SD 12 with Enrollment 1,536. Of the 30 schools shown, 27 are public, 3 are charter.

For the full picture see the wider Oregon largest schools rankings, every school on the North Clackamas SD 12 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 North Clackamas SD 12?

Adrienne C. Nelson High School in Happy Valley, Oregon ranks first among largest schools in North Clackamas SD 12 with Enrollment 1,536 (Enrollment: 1,536).

How are largest schools in North Clackamas SD 12 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.