Simpson Middle School, 3340 Trickum Road, Marietta: grades 6-8, 917 students in 2025, CCRPI 86.9. Zone, report card and bell times.
Last checked Oct. 6, 2026. Sources: the Simpson Middle 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.
Simpson Middle School is a Cobb County School District middle school for sixth through eighth grade on Trickum Road in northeast Cobb County, splitting its students between Lassiter and Sprayberry high schools. 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: 3340 Trickum Road, Marietta, GA 30066
- Phone: 770-971-4711
- Grades: 6 to 8
- Website: cobbk12.org/simpson
Who to call
- Simpson Middle front office: 770-971-4711
- 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 Cory Stanley, according to the school’s website.
Enrollment and teachers
The state counted 917 students at Simpson Middle in its 2025 School Grades data, against 923 in 2024. The most recent federal figure, from the NCES directory for the 2023-24 school year, is 884 students and 56 full-time-equivalent teachers, about 15.8 students per teacher.
State report card
Simpson Middle’s 2025 CCRPI single score was 86.9, according to the state’s School Grades data. The Georgia average for middle schools was 78.4 and the Cobb County School District’s was 80.2. The school scored 79.6 in 2023 and 92.3 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 Simpson Middle 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 | 42.7% | 28.4% |
| Math | 35.8% | 32.2% |
| Science | 45.8% | 21.5% |
| Social studies | 33.9% | 36.7% |
The same data put 75% of eighth 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 Simpson 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 district’s feeder pattern chart, updated June 30, 2024, lists these elementary school zones feeding Simpson Middle: Addison Elementary (26% of its zone), Kincaid Elementary (58% of its zone), Mountain View Elementary (50% of its zone), Rocky Mount Elementary (66% of its zone) and Shallowford Falls Elementary (47% of its zone). The Simpson zone is split at high school: 52% to Lassiter High and 48% to Sprayberry High.
We found no rezoning approved by the Board of Education that changes the Simpson 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 Simpson Middle starting at 9:15 a.m. and dismissing at 4:15 p.m. (all Cobb middle schools keep the same hours).
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 Simpson Middle
- 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 Simpson Middle serve?
Sixth through eighth grade. The state counted 917 students in 2025.
What is Simpson Middle’s CCRPI score?
86.9 in 2025, according to the state’s School Grades data, against a Georgia middle school average of 78.4 and a Cobb County School District average of 80.2.
Which high school does Simpson Middle feed into?
Lassiter High or Sprayberry High, depending on the address, according to the district’s feeder pattern chart.
What time does Simpson Middle start?
The district’s 2026-27 bell schedule has Simpson Middle starting at 9:15 a.m. and dismissing at 4:15 p.m.
Who is the principal of Simpson Middle?
Cory Stanley, according to the school’s website on Oct. 6, 2026.
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