Enrollment
267
High
DISTRICT 758 · STATE 475
SCHOOL COMMUNITY·JANESVILLE SCHOOL DISTRICT·NCES 550702001698
Rock River Charter School
31 W Milwaukee St, Janesville, WI 53548 · (608) 752-8273 · Rock County
GRADES 09–12HIGH13-CITYCHARTERTITLE IALTERNATIVE EDUCATION SCHOOL267 STUDENTS
·
allk12 Grade
Not graded
Schools serving specialized populations are not graded, because state test results are not a fair comparison for them. How grades work
Student : Teacher
16.7:1
16 FTE teachers
DISTRICT 14.7:1 · STATE 14.6:1
Free / Reduced Lunch
76%
204 students
DISTRICT 56% · STATE 42%
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, 2024-25
| Grade | Students | Share |
|---|---|---|
| Grade 9 | 1 | 0% |
| Grade 10 | 28 | 10% |
| Grade 11 | 74 | 28% |
| Grade 12 | 164 | 61% |
Student demographics
56%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
DISTRICT 51% · STATE 54% · US 70%
Student head counts by race/ethnicity from federal NCES enrollment data. District, state, and US figures are each group's share of all public school students in that area (US excludes territories). Very small groups may be suppressed in the source, so categories do not always sum exactly to total enrollment.
Gender split
BeatsExpectations
Not computed for this schoolBeatsExpectations 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 →
Where Rock River Charter School ranks
Among high schools| Measure | This school | In Wisconsin | In Rock County |
|---|---|---|---|
| Enrollment ranked largest first | 267 | #282 of 532 | #9 of 12 |
| Students per teacher ranked fewest first | 16.7:1 | #282 of 325 | #8 of 9 |
| Diversity index ranked most diverse first | 55.7% | #57 of 325 | #2 of 9 |
| Free and reduced lunch ranked highest share first | 76.4% | #31 of 418 | #2 of 11 |
| Enrollment change since 2017-18 ranked fastest growth first | +26.5% | #15 of 128 | N/A |
Ranked against other public high schools. Online schools are left out of every list, and test-score lists leave out schools that serve specialized populations. Each rank links to the full list. Arrows under a test-score rank show places moved since the prior test year, among schools tested both years.
4-year change
SY 2020-21 vs SY 2024-25Enrollment
267
+65 (+32%) vs 2020
+456% since 2000-01, when it was 48
Student : Teacher
16.7:1
was 14.4:1
Source: NCES Common Core of Data
Enrollment and staffing by year
| School year | Students | Teachers (FTE) | Students per teacher | Free and reduced lunch |
|---|---|---|---|---|
| 2024-25 | 267 | 16 | 16.7:1 | 76% (204) |
| 2023-24 | 253 | 15.7 | 16.1:1 | 83% (211) |
| 2022-23 | 249 | 15.9 | 15.7:1 | 78% (195) |
| 2020-21 | 202 | 14 | 14.4:1 | 81% (164) |
| 2017-18 | 211 | 12.5 | 16.9:1 | 69% (145) |
| 2015-16 | 201 | 10 | 20.1:1 | 82% (165) |
| 2010-11 | 130 | 7 | 18.6:1 | 74% (96) |
| 2000-01 | 48 | 1 | 48.0:1 | 21% (10) |
Source: NCES Common Core of Data. Rows are the federal collections on file for Rock River Charter School.
Since 2017-18: students up 27% (211 to 267); teachers up 28% (12.5 to 16).
About Rock River Charter School
Rock River Charter School, located in Janesville, Wisconsin, is a small high school. The school reports 267 students in grades 9 through 12. The school's enrollment is 44% smaller than the 475 average for high schools in Wisconsin.
Rock River Charter School belongs to Janesville School District, a district of 22 schools and 9,355 students.
White students account for 64% of enrollment at Rock River Charter School. Enrollment also includes 12% Black, 11% multiracial, 10% Hispanic, and 3% Asian. The school's White share is 18 points below the 82% share among Rock County residents. The chance that two students picked at random at Rock River Charter School belong to different racial or ethnic groups, known as the diversity index, is 56%.
Federal data list 16 full-time-equivalent teachers at Rock River Charter School in 2024-25, for a ratio of 16.7:1. Among high schools in Wisconsin, the typical ratio is 14.6:1. The lunch program counts 76% of students at Rock River Charter School as eligible for free or reduced-price meals. The rate at public schools in Rock County averages 47%, lower than here.
Census estimates describe Rock County this way: median household income is about $75,673, a bachelor's degree or higher is held by about 26% of adults, and the poverty rate is about 6%. Federal data list 65 public schools in Rock County, with a combined enrollment of about 25,542.
Preschool 4 Janesville is located about 0.6 miles from Rock River Charter School. Within five miles are at least 8 other public schools.
NCES describes the area around Rock River Charter School as City: Small, meaning inside a principal city with a population under 100,000. Rock River Charter School is a public charter school.
Enrollment was 202 in 2020-21 and 267 in 2024-25, a rise of 65 students. In 2020-21, the student-to-teacher ratio was 14.4:1; by 2024-25 it was 16.7:1.
Threads on this page can be about school events, clubs, and volunteer needs. Anyone with firsthand experience at this school can post or comment.
Rock County at a glance
View full county profilePopulation
164,350
Census ACS
Median income
$75,673
Household, ACS
Bachelor's+
26%
Adults 25+
Poverty rate
6%
Below federal line
Schools in county
65
25,542 students
Quick facts
Related schools
Other schools in Janesville School District
- Craig HighHigh · 1,400 students
- Parker HighHigh · 1,272 students
- Marshall MiddleMiddle · 747 students
- Edison MiddleMiddle · 587 students
- Franklin MiddleMiddle · 486 students
- Roosevelt ElementaryElementary · 412 students
Other schools in Janesville
- Craig HighHigh · 1,400 students
- Parker HighHigh · 1,272 students
- Marshall MiddleMiddle · 747 students
- Edison MiddleMiddle · 587 students
- Franklin MiddleMiddle · 486 students
- Roosevelt ElementaryElementary · 412 students
Nearby schools
- Preschool 4 Janesville0.6 mi · 345
- Wilson Elementary0.7 mi · 256
- Roosevelt Elementary0.8 mi · 412
- Adams Elementary1.0 mi · 267
- Washington Elementary1.1 mi · 410
- Craig High1.2 mi · 1,400
Frequently asked questions
About Rock River Charter SchoolWhat is the total enrollment at Rock River Charter School?
Rock River Charter School enrolls approximately 267 students in grades 09-12.
What age range does Rock River Charter School serve?
Rock River Charter School serves students from grade 09 through grade 12.
How many students per teacher at Rock River Charter School?
Approximately 16.7:1 students per teacher at Rock River Charter School.
What is the student diversity at Rock River Charter School?
Student demographics at Rock River Charter School are roughly 64% White, 10% Hispanic, 12% Black, 3% Asian, 11% Two or more.
What district is Rock River Charter School in?
Rock River Charter School is part of Janesville School District.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.