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Schools›Washington›SEATTLE
SCHOOL COMMUNITY·SEATTLE SCHOOL DISTRICT NO. 1·NCES 530771002928

Interagency Detention School

1211 E ALDER MS 1-F, SEATTLE, WA 98122 · (206) 205-9422 · King County
GRADES 06–12HIGH11-CITYREGULAR SCHOOL47 STUDENTS
Enrollment
47
High
DISTRICT 831 · STATE 573
Student : Teacher
,
0 FTE teachers
DISTRICT 17.6:1 · STATE 21.6:1
Free / Reduced Lunch
28%
13 students
DISTRICT 36% · STATE 51%
Community
0
0 members
Enrollment and student:teacher ratio compared against other high schools. Free/Reduced Lunch and demographics compared against all schools.
Enrollment by grade
Grade 7
3
Grade 8
4
Grade 9
1
Grade 10
13
Grade 11
15
Grade 12
11
Student demographics
White
919%
DISTRICT 44% · STATE 47%
Hispanic
1123%
DISTRICT 15% · STATE 27%
Black
2655%
DISTRICT 14% · STATE 5%
Two+
12%
DISTRICT 13% · STATE 9%
Student head counts by race/ethnicity from federal NCES enrollment data. Very small groups may be suppressed in the source, so categories do not always sum exactly to total enrollment.
Gender split
Male
4596%
Female
24%

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Test scores

Smarter Balanced + WCAS 2017-18 . % Met or Exceeded Standard
English Language Arts
27.3%
own-school result
State assessment results for this school reflect a specialized student population. The figures above are the school's own reported scores; they are not directly comparable to state averages or to general-enrollment schools, so the usual state-average comparison line is suppressed here.
Source: Smarter Balanced + WCAS. All students, all grades. See all years and grades →

BeatsExpectations

Not computed for this school
BeatsExpectations is not computed for specialized-population schools (schools for the deaf or blind, therapeutic and behavioral-health placements, juvenile-justice and alternative-education settings, and similar). State ELA/Math proficiency rates are not a comparable metric for these populations, so a demographically-adjusted residual against general-enrollment peers would be misleading. About the methodology →

7-year change

SY 2017-18 vs SY 2024-25
Enrollment
47
+18 (+62%) vs 2017
% White
19%
was 28%
% Hispanic
23%
was 28%
% Black
55%
was 31%
% Asian
0%
was 10%
Source: NCES Common Core of Data

About Interagency Detention School

Located at 1211 E ALDER MS 1-F, in SEATTLE, Washington, Interagency Detention School is a micro-enrollment secondary school that educates 47 students (grades 6 through 12), operated by Seattle School District No. 1. Compared to the state average of about 573 students per school, that is 92% below typical.

Across the 107 schools in Seattle School District No. 1 (50,773 students total), Interagency Detention School accounts for its share of the district's footprint.

In terms of who attends, Interagency Detention School lists that the largest single group is Black, at 55% of enrollment. Other groups include 23% Hispanic, 19% White, 2% multiracial. The wider county runs roughly 7% Black, putting the school's mix noticeably more Black than the area baseline.

On the resource side, An estimated 28% of students are eligible for free or reduced-price lunch, a commonly cited indicator of low-income enrollment. By comparison, King County runs at roughly 38%, so the school's eligibility rate is lower than the surrounding baseline.

Around the school, ACS estimates for King County put the typical household earns roughly $124,746 per year, roughly 57% of adults have completed at least a four-year degree, and roughly 5% of residents live below the federal poverty line. Across King County's 544 public schools (combined enrollment of about 278,492 students), Interagency Detention School is one campus in the mix.

The closest other public school is Bailey Gatzert Elementary School, roughly 0.2 miles away. 8 of the 8 nearest public schools sit inside a five-mile radius.

Interagency Detention School operates from a high-density location.

Looking at the recent track record. Over the past 7-year window, the student count ticked up 62%: 29 students in 2018 compared to 47 in 2025. Black enrollment moved from 31% to 55% across the same window.

Inside the community feed, recent activity here tends to focus on pickup logistics, teacher feedback, and after-school programs. Members of the school community can share what they know.

King County at a glance

View full county profile
Population
2,287,171
Census ACS
Median income
$124,746
Household, ACS
Bachelor's+
57%
Adults 25+
Poverty rate
5%
Below federal line
Schools in county
544
278,492 students

Quick facts

School name
Interagency Detention School
District
Seattle School District No. 1
Address
1211 E ALDER MS 1-F, SEATTLE, WA 98122
Phone
(206) 205-9422
County
King County
Level
High
Grade range
06–12
Total enrollment
47
Teachers (FTE)
0
Free/Reduced lunch
13 (28%)
Locale
11-City: Large
NCES ID
530771002928
Charter school
No
Virtual school
No

Related schools

Other schools in Seattle School District No. 1
Other schools in SEATTLE
Nearby schools

Frequently asked questions

About Interagency Detention School
How large is Interagency Detention School?
Interagency Detention School enrolls approximately 47 students in grades 06-12.
What grades does Interagency Detention School serve?
Interagency Detention School serves grades 06-12.
How many teachers does Interagency Detention School have?
Interagency Detention School employs 0 FTE teachers.
What is the student diversity at Interagency Detention School?
Student demographics at Interagency Detention School are roughly 19% White, 23% Hispanic, 55% Black, 2% Two or more.
What district is Interagency Detention School in?
Interagency Detention School is part of Seattle School District No. 1.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.
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