When you go to the county page here on RadioReference, you can explore all frequencies licensed in a county by clicking on the Blue Menu at the top right and selecting FCC Licenses.
By looking at Jim Wells County, I found two Licenses for Orange Grove
The PD was licensed for 155.0775 but that license expired in 2018, and I don't see any further licenses:
FCC Callsign WQIZ701 (CITY OF ORANGE GROVE POLICE DEPARTMENT)
www.radioreference.com
The Volunteer FD is licensed for 155.175:
FCC Callsign WQJA506 (ORANGE GROVE VOLUNTEER FIRE DEPT.)
www.radioreference.com
I know in Northern Texas some small town PD's were moved to be dispatched by the county SO (consolidation and simplification of both dispatch and E911 services), have you verified that has not happened here?