For the 2026 school year, there are 9 public charter schools serving 2,517 students in King County, WA. The top-ranked public charter schools in King County, WA are Impact Public Schools, Rainier Prep and Summit Public School Atlas. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.
King County, WA public charter schools have an average math proficiency score of 41% (versus the Washington public charter school average of 42%), and reading proficiency score of 51% (versus the 54% statewide average). Charter schools in King County have an average ranking of 6/10, which is in the top 50% of Washington public charter schools.
Minority enrollment is 83% of the student body (majority Black), which is more than the Washington public charter school average of 66% (majority Black).
Best Public Charter Schools in King County (2026)
School
(Math and Reading Proficiency)
(Math and Reading Proficiency)
Location
Quick Facts
Rank: #11.
Impact Public Schools
Charter School
(Math: 52% | Reading: 55-59%)
Rank:
Rank:
8/
Top 30%10
3438 S. 148th Street
Seattle, WA 98168
(206) 712-7640
Seattle, WA 98168
(206) 712-7640
Gr: K-5 | 478 students Student-teacher ratio: 13:1 Minority enrollment: 90%
Rank: #22.
Rainier Prep
Charter School
(Math: 50% | Reading: 51%)
Rank:
Rank:
7/
Top 50%10
10211 12th Ave S
Seattle, WA 98168
(206) 494-5979
Seattle, WA 98168
(206) 494-5979
Gr: 5-8 | 333 students Student-teacher ratio: 14:1 Minority enrollment: 95%
Rank: #33.
Summit Public School Atlas
Charter School
(Math: 43% | Reading: 52%)
Rank:
Rank:
6/
Top 50%10
9601 35th Avenue Sw
Seattle, WA 98126
(206) 307-7645
Seattle, WA 98126
(206) 307-7645
Gr: 6-12 | 545 students Student-teacher ratio: 19:1 Minority enrollment: 63%
Rank: #44.
Summit Public School Sierra
Charter School
(Math: 25-29% | Reading: 60-64%)
Rank:
Rank:
6/
Top 50%10
1025 S King St
Seattle, WA 98134
(206) 453-2520
Seattle, WA 98134
(206) 453-2520
Gr: 9-12 | 221 students Student-teacher ratio: 17:1 Minority enrollment: 63%
Rank: #55.
Summit Public School Olympus
Charter School
(Math: 11-19% | Reading: 50-59%)
Rank:
Rank:
3/
Bottom 50%10
409 Puyallup Ave
Seattle, WA 98134
(253) 444-9781
Seattle, WA 98134
(253) 444-9781
Gr: 9-12 | 148 students Student-teacher ratio: 15:1 Minority enrollment: 80%
Rank: #66.
Rainier Valley Leadership Academy
Charter School
(Math: 10-14% | Reading: 25-29%)
Rank:
Rank:
1/
Bottom 50%10
6020 Rainier Avenue S
Seattle, WA 98118
(206) 659-0956
Seattle, WA 98118
(206) 659-0956
Gr: 6-12 | 163 students Student-teacher ratio: 14:1 Minority enrollment: 97%
Rank: n/an/a
Cascade Public Schools
Magnet School
Charter School
Charter School
22419 Pacific Highway South
Seattle, WA 98198
(253) 271-8629
Seattle, WA 98198
(253) 271-8629
Gr: 9-12 | 193 students Student-teacher ratio: 16:1 Minority enrollment: 94%
Rank: n/an/a
Impact Black River Elementary School
Charter School
16950 116th Ave Se
Renton, WA 98058
(206) 712-7640
Renton, WA 98058
(206) 712-7640
Gr: K-5 | 129 students Student-teacher ratio: 14:1 Minority enrollment: 88%
Rank: n/an/a
Impact Salish Sea Elementary School
Charter School
3438 S. 148th Street
Seattle, WA 98168
(206) 712-7640
Seattle, WA 98168
(206) 712-7640
Gr: K-5 | 307 students Student-teacher ratio: 13:1 Minority enrollment: 93%
King County Public Schools (Closed)
School
Location
Quick Facts
19-21 Transition Academy (Closed 2013)
Special Education School
16642 Cleveland St
Redmond, WA 98052
(425) 861-3452
Redmond, WA 98052
(425) 861-3452
Gr: 12
4424 South 188th Street, 700 B
Seattle, WA 98188
(206) 631-6500
Seattle, WA 98188
(206) 631-6500
Gr: 9-12 | 468 students Student-teacher ratio: 19:1 Minority enrollment: 89%
African American Academy K-8 (Closed 2010)
Alternative School
8311 Beacon Av S
Seattle, WA 98118
(206) 252-6650
Seattle, WA 98118
(206) 252-6650
Gr: K-8 | 353 students Student-teacher ratio: 16:1 Minority enrollment: 99%
Alternative Junior High School (Closed 2007)
Alternative School
18603 Bothell Wy Ne
Bothell, WA 98011
(425) 489-6244
Bothell, WA 98011
(425) 489-6244
Gr: 7-8 | 13 students Minority enrollment: 23%
Ancillary (Closed 2013)
Special Education School
15675 Ambaum Blvd Sw
Seattle, WA 98166
(206) 433-2125
Seattle, WA 98166
(206) 433-2125
Gr: PK-12
830 Sw 116th St
Seattle, WA 98146
(206) 631-6250
Seattle, WA 98146
(206) 631-6250
Gr: 9-12 | 305 students Student-teacher ratio: 15:1 Minority enrollment: 87%
5701 Kersey Way Se
Auburn, WA 98092
(253) 931-4715
Auburn, WA 98092
(253) 931-4715
Gr: 1-12 | 264 students Student-teacher ratio: 10:1 Minority enrollment: 74%
Best Night School (Closed 2013)
Alternative School
10903 Ne 53rd St
Kirkland, WA 98033
(425) 936-2300
Kirkland, WA 98033
(425) 936-2300
Gr: 9-12
Birth To 3 Contracts (Closed 2023)
Special Education School
2445 3rd Av S
Seattle, WA 98124
(206) 252-0809
Seattle, WA 98124
(206) 252-0809
Gr: PK
Boyer Clinic Elementary School (Closed 2013)
Special Education School
1850 Boyer Ave East
Seattle, WA 98112
(206) 252-0838
Seattle, WA 98112
(206) 252-0838
Gr: PK
The Bridge (Closed 2023)
Special Education School
2142 10 Av W
Seattle, WA 98119
(206) 252-0832
Seattle, WA 98119
(206) 252-0832
Gr: K-12 | 1 student
Bsd Vocational Edcareer Education Options High School (Closed 2015)
Alternative School
12111 Ne 1st Street
Bellevue, WA 98005
(425) 456-4108
Bellevue, WA 98005
(425) 456-4108
Gr: 9-12 | 34 students Minority enrollment: 24%
Career Development Learning Cente (Closed 2004)
Alternative School
919 Sw Grady Way Ste 125
Renton, WA 98055
(206) 205-6510
Renton, WA 98055
(206) 205-6510
Gr: 9-12 | 42 students Minority enrollment: 59%
Career Education Options High School (Closed 2009)
Alternative School
16101 Greenwood Avenue N.
Seattle, WA 98133
(206) 368-4118
Seattle, WA 98133
(206) 368-4118
Gr: 11 | 220 students Minority enrollment: 19%
Career Link High School (Closed 2006)
Alternative School
2445 3 Av S
Seattle, WA 98134
(206) 252-0732
Seattle, WA 98134
(206) 252-0732
Gr: 9-12 | 185 students Minority enrollment: 63%
Cascade Parent Partnership Program (Closed 2023)
Alternative School
2919 1st Avenue West
Seattle, WA 98119
(206) 706-4270
Seattle, WA 98119
(206) 706-4270
Gr: K-8 | 213 students Minority enrollment: 62%
Childhaven (Closed 2023)
Alternative School
650 South Orcas Street
Seattle, WA 98108
(253) 945-2084
Seattle, WA 98108
(253) 945-2084
Gr: PK-12 | 3 students
Childhaven Elementary School (Closed 2013)
Special Education School
302 Broadway Av
Seattle, WA 98122
(206) 252-0838
Seattle, WA 98122
(206) 252-0838
Gr: PK-5
Children's Institute For Learning Differences (Closed 2023)
Special Education School
4030 86th Ave Se Suite F
Mercer Island, WA 98040
(253) 945-2084
Mercer Island, WA 98040
(253) 945-2084
Gr: PK-12 | 1 student
1901 Sw Genesee St
Seattle, WA 98106
(206) 252-8170
Seattle, WA 98106
(206) 252-8170
Gr: PK-5 | 266 students Student-teacher ratio: 17:1 Minority enrollment: 82%
Destiny Ale School (Closed 2023)
Alternative School
210 South Hudson Street
Seattle, WA 98134
(509) 258-4534
Seattle, WA 98134
(509) 258-4534
Gr: 6-8
29300 Ne 150th St
Duvall, WA 98019
(425) 844-4900
Duvall, WA 98019
(425) 844-4900
Gr: K-5 | 58 students Student-teacher ratio: 19:1 Minority enrollment: 28%
1900 N 170th St
Seattle, WA 98155
(206) 393-4250
Seattle, WA 98155
(206) 393-4250
Gr: PK | 60 students Student-teacher ratio: 12:1 Minority enrollment: 42%
4255 153rd Avenue Se
Bellevue, WA 98006
(425) 456-5100
Bellevue, WA 98006
(425) 456-5100
Gr: PK-5 | 316 students Student-teacher ratio: 17:1 Minority enrollment: 71%
Education Service Centers (Closed 2018)
Alternative School
1330 N 90 St
Seattle, WA 98108
(206) 252-4789
Seattle, WA 98108
(206) 252-4789
Gr: 6-12
Eeu Special Education Elementary School (Closed 2023)
Special Education School
4160 86th Ave Se
Mercer Island, WA 98040
(206) 236-3325
Mercer Island, WA 98040
(206) 236-3325
Gr: PK-4 | 4 students
Erac Special Education (Closed 2013)
Special Education School
15675 Ambaum Blvd Sw
Seattle, WA 98166
(206) 433-2125
Seattle, WA 98166
(206) 433-2125
Gr: PK-12
Evening School (Marshall) (Closed 2013)
Alternative School
4400 Interlake Ave North
Seattle, WA 98103
(206) 252-4680
Seattle, WA 98103
(206) 252-4680
Gr: 9-12
Excel Ale School (Closed 2023)
Alternative School
210 South Hudson St Ste 318
Seattle, WA 98134
(509) 258-4534
Seattle, WA 98134
(509) 258-4534
Gr: 6-7
Excel Public Charter School (Closed 2020)
Charter School
19300 108th Ave Se
Kent, WA 98031
(253) 487-7530
Kent, WA 98031
(253) 487-7530
Gr: 7-10 | 188 students Student-teacher ratio: 14:1 Minority enrollment: 72%
Experimental Education Unit Elementary School (Closed 2023)
Special Education School
1959 Ne Pacific St
Seattle, WA 98195
(206) 252-0806
Seattle, WA 98195
(206) 252-0806
Gr: PK-K | 66 students
33330 8th Ave S
Federal Way, WA 98003
(253) 945-2000
Federal Way, WA 98003
(253) 945-2000
Gr: 11-12 | 3 students Minority enrollment: 67%
First Place Scholars Charter School (Closed 2023)
Charter School
170 20th
Seattle, WA 98122
(206) 323-6715
Seattle, WA 98122
(206) 323-6715
Gr: K-5 | 106 students Student-teacher ratio: 18:1 Minority enrollment: 96%
Show 88 more closed public schools in King County, WA (out of 123 total schools)
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Frequently Asked Questions
What are the top-ranked public charter schools in King County, WA?
The top-ranked public charter schools in King County, WA include Impact Public Schools, Rainier Prep and Summit Public School Atlas. King County has one of the highest concentrations of top-ranked public schools in Washington.
How many public charter schools are located in King County?
9 public charter schools are located in King County.
What is the racial composition of students in King County?
King County public charter schools minority enrollment is 83% of the student body (majority Black), which is more than the Washington public charter schools average of 66% (majority Black).
Which public charter schools in King County are often viewed compared to one another?
Popular comparisons of public charter schools in King County include: Summit Public School Olympus vs. Summit Public School Atlas, Summit Public School Sierra vs. Summit Public School Atlas, Summit Public School Olympus vs. Summit Public School Sierra