You have no idea what you're talking about. Towns in the boonies don't fund themselves the same way as cities, nor do they provide the same level of public utilities and services. Many small towns only provide electrical service and basic copper phone service--no water, sewer, high-speed internet, etc.

> Longer roads, longer sidewalks, longer water and sewer pipes.

Digging a trench for that new pipe out in boonies over a dirt field can be done in an afternoon by one guy with a backhoe. Putting in the same length of pipe underground in Manhattan will probably take a decade and astronomical amount of money.

When you live in the boonies, utilities are provided for by the local municipality. Water is usually well water. Waste goes to a septic tank.

There is no additional infrastructure cost placed on cities. You are just plain wrong.

The suburbs in my area are all served by the local city. I’m not talking about rural areas.

Ah, your original comment said "boonies" which denotes rural areas far outside of a city.