Texas APS runs one statewide 24-hour hotline (1-800-252-5400) rather than separate county offices with separate numbers. This is the same number whether you're calling from Fort Worth, Arlington, Burleson, or anywhere else in Tarrant, Parker, Johnson, Denton or Wise County.
What to do next
This is a genuinely simpler structure than some states use, and it's worth knowing in advance so you're not searching for a Tarrant-County-specific APS number that doesn't exist as a separate line. Investigators are assigned locally once a report comes in through the statewide system, so the response itself is still handled by staff familiar with the Fort Worth area -- the statewide number is just the single front door for making that report, day or night, without needing to identify the correct local office first.