57k is not a modest living in Fairfax. Fairfax is the 5th wealthiest county in the country.

The median household income there is $127k. Falls Church is right there as well. It’s median is $146k, the second richest county/city in the country by a margin.

They’re making about median if they’re the sole earner. That seems right for people running a county more populous than Montana.

As an edit, those median incomes are a few years ago. Wages have gone up in VA since, both on min wage increases and in general. 130k is probably the median now.