Most areas in the southeastern Pennsylvania area that are in small cities/townships Upper Darby/Norristown/Coatesville/Chester etc.. With large row home/twins lower income areas Whose school districts aren't subsidized by the federal government/and or high wage taxes as large cities like Philadelphia are. Have a much larger School tax. A perfect example of this is along Trooper Road in the Norristown & Methacton School District areas. The single homes in this area are not priced all that differently But if you buy a house on the Norristown School District side of Trooper road you are going to pay at least a few hundred dollars more for the same priced house across Trooper Road in the Methacton School District. As for this particular area. Drexel Hill which is in the Upper Darby School district. Has a lot of big beautiful homes. That are reasonably priced on the surface. But the trade off of much higher taxes puts the final mortgage out of reach of people looking at houses listed in their price range. Right across Township Line in Haverford Township. Which has basically the same type of houses for a few blocks. The same house would run 100K/150K more to buy. But would be few thousand dollars less in taxes.
There can be several possible reasons for that:
The cost of running the County government,
The fact that a lot of people are willing to pay that high amount,
The County government is corrupt or inept,
or, simply because they can.