The Statutes for these States do not reflect Court decisions:
Without a specific State Statute, Courts may give an opinion or decision that says Child Support should be paid beyond age 18 giving a "common law", or "case law" interpretation.

Currently, 7 States statutorily forbid "post-secondary education" child support. They are:

Kansas.........KS 60-1610
Louisiana.......RS 9=309
Maine ..........MRS. 19s 303
North Dakota. NDCC-08-0
Oklahoma......O S 10 ss 16
Vermont....... .T 15 ss 658
Wisconsin ....767.25

There are 15 States with case laws forbidding "post-secondary Education" child support. They are:

Alaska,.......679 P2d 480 (1984)
Arizona,......575 P2d 1243 (1978)
Delaware,....??? A2d 924 (1973)
Florida,........450 S2d 853 (1984)
Georgia,.......260 SE2d 871 (1979)
Idaho,.......... 184 P 470 (1919)
Kentucky,.....282 SW2d 146 (1955)
Montana,......589 P2d 148 (1979)
New Mexico,..666 P2d 781 (1983)
North Carolina,..330 SE2d 57 (1985)
Ohio,..............477 NE2d 648 (1984)
Pennsylvania,..616 A2d 628 (1992) - see below
Rhode Island,..391 A2d 79 (1978)
South Dakota,...417 NW2d 891 (1988)
Virginia,........... 261 SE2d 52 (1979)

Pennsylvainia's Supreme Court struck down a provision that allowed child support over 18 in Curtis v. Kline.

11 States have restrictive laws for child support after "post-secondary education". They are:

Alabama
Colorado
Iowa (to age 22 only)
Maryland
Massachusetts
Michigan (to age 21 only)
Minnesota
New York
Oregon
Texas
Utah

7 States are silent on the issue of continued child support beyond "post-secondary" education. They are:

Arkansas
Hawaii
Indiana
Nebraska
Nevada
New Hampshire
West Virginia

Finally, 10 States allow for "post-secondary" education child support. They are:

California
Connecticut
Illinois
Mississippi
Missouri
New Jersey
South Carolina
Tennessee
Washington
Wyoming