Unfortunately, Portland is one. Been living here for the past 6 years and I've watched the city rapidly fall apart in the last couple of years. We've had the most violent years on record. Homelessness has skyrocketed.
I can't say that this is directly caused by reduced police budget (there are a ton of factors), but I can confidently say the city is horribly managed.
The most recent example is the city government's proposal to force homeless folks into designated camps that would cost a minimum of $4k per tent (this number comes from the city's own report). That's more than what many Portlanders live on, and they'd still be living in tents.
Out of curiosity: Can you provide some cities with similar equivalence and violence?