According the IAHSAA handbook, here's how the the baseball classes are determined by their BEDS ranking
4A---- Largest 48 (1-48)
3A---- Next 64 (49-112)
2A---- Next 96* (113-209)
1A---- Remainder (>=210)
Hinton BED rank is 199 (169 students), Van Meter is 202 (165 students). It looks like both should be classified for 2A this year for baseball.
*Last year had 97 teams play in 2A due to one team petitioning to play up a class
Assuming no petitions for playing up a class this year and no district consolidations applying to this years baseball season:
Largest 4A = Valley (2036 students)
Smallest 4A = Norwalk (605)
Largest 3A = Epworth-Western Dubuque (577)
Smallest 3A = Union/Laporte City (294)
Largest 2A = Iowa Falls/Alden (293)
Smallest 2A = Jesup (160)
Largest 1A = North Union (159)
Smallest 1A = ?.(25 schools with less than 50 students)