It depends on the city and the rules in the state where the city is located. Larger cities are pretty independent with taxation, police, fire, education, sanita

It depends on the city and the rules in the state where the city is located. Larger cities are pretty independent with taxation, police, fire, education, sanitation, and health services. Smaller cities can be overseen by regional governments. The smallest unincorporated cities buy services from larger neighbors. Lots of variation! Cities in the US don't get militaries (but, technically, the federal military isn't allowed to carry out military operations inside cities).