This includes both educational/NET/PBS and religious/TBN/Daystar stations, but only those that had actually gone on the air.
I'm not looking for commercial CPs that never made it to air. For example, commercial CP WIND-TV 20 Chicago becoming non-comm WXXW, or WRTB-TV 2 Boston becoming WGBH-TV. I'm not counting these.
Commercial to non-commercial
New York/Newark Ch. 13 - WNTA (Ind.) to WNDT (NET) in 1962
Muncie IN Ch. 49 - WLBC-TV (NBC/ABC) to WIPB (PBS) in 1971
Sedalia MO Ch. 6 - KMOS-TV (CBS s-KRCG) to PBS in 1978.
Phoenix Ch. 21 - KPAZ-TV independent (but mostly religious programs by the mid-'70s) to TBN (1977)
Went both ways
Seattle/Tacoma's Ch. 13 went from commercial (KMO-TV, later KTVW, 1953) to non-comm (KCPQ, 1975), and back (1980, still as KCPQ). It went from NBC to indie to PBS to indie to Fox.
Went both ways at the same time
Ames/Des Moines IA Ch. 4/5 - WOI-TV ran educational programs during part of the day and commercial programming the rest of the time, from sign-on in 1950 until KDPS (KDIN) Ch. 11 signed on in 1959.
Jackson/East Lansing MI Ch. 10 - WILX (NBC) Jackson and WMSB (NET/PBS) East Lansing shared time between 1959 and 1972.
Non-comm to commercial(?)
I'm not sure you can count the WPWR/WCAE/WYIN Ch. 50-56 Chicago/Gary shenanigans of 1986-87. IIRC, WYIN Ch. 56 operates under the old WCAE Ch. 50 license, not WPWR. WCAE had left the air a few years earlier, but the callsign was resurrected to test the new Ch. 50 transmitter in late '86, and I don't believe the license was ever turned in to the FCC.
I'm not looking for commercial CPs that never made it to air. For example, commercial CP WIND-TV 20 Chicago becoming non-comm WXXW, or WRTB-TV 2 Boston becoming WGBH-TV. I'm not counting these.
Commercial to non-commercial
New York/Newark Ch. 13 - WNTA (Ind.) to WNDT (NET) in 1962
Muncie IN Ch. 49 - WLBC-TV (NBC/ABC) to WIPB (PBS) in 1971
Sedalia MO Ch. 6 - KMOS-TV (CBS s-KRCG) to PBS in 1978.
Phoenix Ch. 21 - KPAZ-TV independent (but mostly religious programs by the mid-'70s) to TBN (1977)
Went both ways
Seattle/Tacoma's Ch. 13 went from commercial (KMO-TV, later KTVW, 1953) to non-comm (KCPQ, 1975), and back (1980, still as KCPQ). It went from NBC to indie to PBS to indie to Fox.
Went both ways at the same time
Ames/Des Moines IA Ch. 4/5 - WOI-TV ran educational programs during part of the day and commercial programming the rest of the time, from sign-on in 1950 until KDPS (KDIN) Ch. 11 signed on in 1959.
Jackson/East Lansing MI Ch. 10 - WILX (NBC) Jackson and WMSB (NET/PBS) East Lansing shared time between 1959 and 1972.
Non-comm to commercial(?)
I'm not sure you can count the WPWR/WCAE/WYIN Ch. 50-56 Chicago/Gary shenanigans of 1986-87. IIRC, WYIN Ch. 56 operates under the old WCAE Ch. 50 license, not WPWR. WCAE had left the air a few years earlier, but the callsign was resurrected to test the new Ch. 50 transmitter in late '86, and I don't believe the license was ever turned in to the FCC.