#1 Private Schools with the Smallest Classes in McHenry County, IL
Crystal Lake Montessori School
Montessori school · Grades Pre-K–8
3.2 students per teacher
Woodstock, IL
A+Overall grade76 students3 students per teacher
2026 lists
Private Schools with the Smallest Classes in McHenry County, IL
Private schools in McHenry County, IL with the fewest students per teacher (not counting preschools and special education schools). Top 11 of 11 schools.
#2 Private Schools with the Smallest Classes in McHenry County, IL
St. John the Baptist Catholic School
Diocesan school · Grades Pre-K–8
4.5 students per teacher
Johnsburg, IL
A+Overall grade54 students5 students per teacher
#3 Private Schools with the Smallest Classes in McHenry County, IL
St. Thomas the Apostle School
Diocesan school · Grades Pre-K–8
9.1 students per teacher
Crystal Lake, IL
A+Overall grade164 students9 students per teacher
#4 Private Schools with the Smallest Classes in McHenry County, IL
SS Peter & Paul School
Parish school · Grades Pre-K–8
9.7 students per teacher
Cary, IL
A+Overall grade167 students10 students per teacher
#5 Private Schools with the Smallest Classes in McHenry County, IL
St. Mary Catholic School
Diocesan school · Grades Pre-K–8
10.3 students per teacher
Woodstock, IL
A+Overall grade125 students10 students per teacher
#6 Private Schools with the Smallest Classes in McHenry County, IL
Montini Catholic School
Diocesan school · Grades Pre-K–8
11.1 students per teacher
McHenry, IL
A+Overall grade196 students11 students per teacher
#7 Private Schools with the Smallest Classes in McHenry County, IL
Trinity Oaks Christian Academy
Christian school (nondenominational) · Grades Pre-K–12
11.9 students per teacher
Cary, IL
BOverall grade268 students12 students per teacher
#8 Private Schools with the Smallest Classes in McHenry County, IL
Marian Central Catholic High School
Diocesan school · Grades 9–12
12.4 students per teacher
Woodstock, IL
A+Overall grade294 students12 students per teacher
#9 Private Schools with the Smallest Classes in McHenry County, IL
Immanuel Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–8
12.5 students per teacher
Crystal Lake, IL
B-Overall grade232 students13 students per teacher
#10 Private Schools with the Smallest Classes in McHenry County, IL
Zion Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–8
14.7 students per teacher
Marengo, IL
B-Overall grade191 students15 students per teacher
#11 Private Schools with the Smallest Classes in McHenry County, IL
St. Margaret Mary Catholic School
Diocesan school · Grades Pre-K–8
16.6 students per teacher
Algonquin, IL
BOverall grade166 students17 students per teacher
From official public records, updated October 2026.