I took a look, and according to the
county there are four school districts. I was able to find all four school districts (and a couple of others) that have licenses with the FCC in the county. None of the licenses are for trunked systems, so there's not something that's going to beacon out when the system is idle. Also, they all show only a single repeater frequency, and a lot of "mobile to mobile" frequencies, which would usually be used for intra-campus - meaning that you'd have to be very close to the campus to pick them up, while the repeater frequency is likely used for school busses, and the only time you would regularly hear that is before and after school when t the busses are on their assigned routes.
So here's what I found (you can look at the linked licenses for all of the mobile frequencies):
West Orange-Cove Consolidated ISD:
Repeater 452.1 Analog Voice/DMR Voice.
WQUS296
West Orange-Cove Consolidated ISD also already shows in RRDB with two repeaters, but that license has expired:
West Orange-Cove Consolidated ISD (RRDB)
Little Cypress-Mauriceville ISD:
Repeater 462.075 Analog Voice/DMR Voice.
WQUF913
Bridge City ISD:
Repeater 464.4 Analog Voice/NXDN Voice.
WQAM222
Orangefield ISD:
Repeater 464.475 Analog Voice Only
WQBR704 (This license is for the repeater only)
Orangefield ISD also has a second license with all of the mobiles, licensed for both Analog Voice and DMR Voice:
WRYF316
Vidor ISD also shows a repeater in Orange County:
Repeater: 463.925 Analog Voice/DMR Voice.
WQLE309
Vidor ISD also already shows in RRDB, with a VHF Frequency, but that license has expired:
Vidor Independent School District (RRDB)
And finally, Tekoa Charter School has a number of frequencies licensed for mobile, using Analog Voice, but no repeater:
WRYG909
I'm sure the RRDB Admins would appreciate the submissions to provide up to date information and removing outdated data.