Blackwell Elementary School, 3470 Canton Road, Marietta: K-5, 610 students in 2025, CCRPI 71.4. Zone, report card and bell times.
Last checked Oct. 6, 2026. Sources: the Blackwell Elementary website, the Cobb County School District’s attendance zones, feeder pattern chart, bell schedule and 2026-27 calendar, the Governor’s Office of Student Achievement’s 2025 School Grades data and the federal NCES school directory.
Blackwell Elementary School is a Cobb County School District elementary school on Canton Road in the Blackwells area of northeast Cobb County, where its zone splits between the Sprayberry and Kell feeder patterns. Its mailing address says Marietta, but the address sits outside any city’s limits, in unincorporated Cobb County, according to the Census Bureau’s geocoder.
- Address: 3470 Canton Road, Marietta, GA 30066
- Phone: 678-494-7600
- Grades: kindergarten to 5 (the state’s 2025 data also counts pre-K students)
- Website: cobbk12.org/blackwell
Who to call
- Blackwell Elementary front office: 678-494-7600
- Enroll a student: the district’s enrollment page; families who need an interpreter can call the International Welcome Center at 678-331-3086
- Bus routes and transportation: the district’s Transportation Department, 678-594-8000, and its bus route finder
- Cobb County School District main line: 770-426-3300
- Is this your school? Enter an address in the school and bus locator
Principal
Principal Missy Shackelford, according to the school’s website.
Enrollment and teachers
The state counted 610 students at Blackwell Elementary in its 2025 School Grades data, against 619 in 2024. The most recent federal figure, from the NCES directory for the 2023-24 school year, is 583 students and 51 full-time-equivalent teachers, about 11.4 students per teacher.
State report card
Blackwell Elementary’s 2025 CCRPI single score was 71.4, according to the state’s School Grades data. The Georgia average for elementary schools was 78.6 and the Cobb County School District’s was 76.0. The school scored 69.1 in 2023 and 84.3 in 2024. Scores can move a lot from one year to the next at a single school. The full report card, with subgroups and the parts of the score, is on the state’s Blackwell Elementary report card.
CCRPI is the Georgia Department of Education’s “comprehensive school improvement, accountability, and communication platform,” according to GaDOE. The single score runs from 0 to 100 and is built from content mastery, progress, closing gaps and readiness, plus graduation rate for high schools. Georgia does not publish an A-to-F letter grade for schools in its 2025 data.
Georgia Milestones end-of-grade tests, 2025, share of tested students scoring Proficient and Distinguished, the two upper achievement levels:
| Subject | Proficient | Distinguished |
|---|---|---|
| English language arts | 28.9% | 11.7% |
| Math | 31.6% | 13.1% |
| Science | 30.8% | 7.5% |
The same data put 50% of third graders and 50% of fifth graders reading at or above grade level.
Attendance zone
Zones are set by the district and do not follow ZIP codes. Check any address with the district’s school and bus locator, or open the district’s Blackwell zone map (PDF) from its attendance zones page. The district says its posted maps “do not preclude any future changes” and asks families not to make a home purchase based on them alone.
The Blackwell zone is split between middle schools. The district’s feeder pattern chart, updated June 30, 2024, sends 63% to Daniell Middle and 37% to McCleskey Middle. For high school, the school’s feeder schools page lists Kell High and Sprayberry High; the school locator gives the high school for an exact address.
We found no rezoning approved by the Board of Education that changes the Blackwell zone for 2026-27; the district’s posted zone maps are labeled 2022-23 for high schools and 2023-24 for middle and elementary schools.
Calendar and bell times
The district’s 2026-27 bell schedule (PDF) has Blackwell Elementary starting at 7:50 a.m. and dismissing at 2:20 p.m..
From the district’s 2026-27 calendar (PDF):
- Monday, Oct. 12: digital learning day
- Tuesday, Oct. 13, to Friday, Oct. 16: conference week, early release for elementary and middle schools only
- Tuesday, Nov. 3: Election Day, student holiday
- Nov. 23-27: Thanksgiving break
- Thursday, Dec. 17, and Friday, Dec. 18: early release, all schools
- Dec. 21 to Jan. 1: winter break; Monday, Jan. 4, is a student holiday
- Wednesday, May 19, 2027: last day of school
More
- The school’s website
- The state’s report card for Blackwell Elementary
- Every public school in East Cobb, with zones and scores: our East Cobb public schools guide
- District calendar, registration and the Board of Education: our East Cobb schools guide
Frequently asked questions
What grades does Blackwell Elementary serve?
Kindergarten through fifth grade. The state counted 610 students in 2025. The state’s data also counts pre-K students at the school.
What is Blackwell Elementary’s CCRPI score?
71.4 in 2025, according to the state’s School Grades data, against a Georgia elementary school average of 78.6 and a Cobb County School District average of 76.0.
Which high school does Blackwell Elementary feed into?
Middle school: Daniell Middle or McCleskey Middle, depending on the address. High school: Kell High or Sprayberry High, according to the school’s feeder page and the district’s feeder pattern chart.
What time does Blackwell Elementary start?
The district’s 2026-27 bell schedule has Blackwell Elementary starting at 7:50 a.m. and dismissing at 2:20 p.m.
Who is the principal of Blackwell Elementary?
Missy Shackelford, according to the school’s website on Oct. 6, 2026.
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