I can see the subsidy in some areas, like USPS mail (which has the same retail cost all over the USA, but is definitely lowest for the government to service in cities, thus providing a nationwide subsidy to rural areas).
But for items like sewer pipes, wiring, sidewalk, that seems to be serviced on a town level, so if you live in a more rural town, the property taxes per unit of house should be more. This means the above costs should be internalized pretty well.
But the tax bases in subdivisions AREN'T high enough to cover the maintenance costs. This causes towns to chase new development to attract more tax payers and the whole cycle repeats. There just isn't enough tax base in a subdivision to cover the maintenance burden when the time comes.
But for items like sewer pipes, wiring, sidewalk, that seems to be serviced on a town level, so if you live in a more rural town, the property taxes per unit of house should be more. This means the above costs should be internalized pretty well.