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Could be they all need to push to get fully annexed into a single community. If the county & district line ran down the middle of all of their lots, each would own property in both districts. The way they could find out whether or not they're getting double taxed would involve finding out the amount each taxing authority is applying its mill rate to, in order to determine the tax liability. If both are using an identical value, more digging would be need to be done. The value on the portion of the property that has improvements should be quite a bit higher, less we're talking really funky, with the line running down the middle of all of their houses. Services, such as sewers, schools, police, fire & garbage collection all have lines. They may need to dig into the entities that provide them to their properties to build a case challenging the non-provider's taxing authority.

They'd be unable to vote in one of the counties & one of the communities that hold taxing authority over a portion of their properties. The community & county they're allowed to vote in would be the first place they should go in order to get an annexing question into the governing board's schedule.

When the county I live in was split, long, long ago, property records were raided from the old county courthouse in the middle of the night. One of the books went missing for years & was discovered behind a bookshelf when a remodeling project was done.

Neighborhoods were built out of farms & the original farmers determined which school district their properties belonged in, which is how my community's school district map became such a hodge podge. County courthouses should have the paperwork. It may take digging around in the records of both counties. If there is an overlap, they need to force the counties to fight it out.