Law Enforcement Agencies in North River Shores, FL FL › Martin County Agencies serving the city of North River Shores in FL. Agency Types in North River Shores County Jails 1 agencies Municipal Police 1 agencies Parole Probation 1 agencies Sheriff 1 agencies All Agencies in North River Shores, FL Martin County Jail Martin County Martin County Sheriffs Office Martin County Probation & Parole Services Martin County Stuart Police Department Martin County